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Institute
- Medizin (2562) (remove)
With obesity having doubled in the last decade, hypertension is on the rise. In one-third of hypertensive patients the metabolic syndrome is present. This might be one factor for the increasing number of prescriptions for angiotensin receptor blockers and calcium-channel blockers besides a more favorable risk-to-benefit ratio. The aim of the present study was to evaluate a therapeutic drug monitoring (TDM) method for assessment of adherence based on cut-offs in inpatients and to compare it to an established urine drug screening in outpatients. A method for quantification of calcium-channel blockers and angiotensin receptor blockers using high-performance liquid chromatography-tandem mass spectrometric analysis (LC-MS/MS) was developed and validated. The method was applied to serum samples of 32 patients under supervised medication to establish cut-off values for adherence assessment based on dose-related concentrations (DRC, calculated from pharmacokinetic data). Furthermore, corresponding urine and blood samples of 42 outpatients without supervised medication were analysed and the results compared with regard to adherence assessment. All serum concentrations measured for amlodipine (n = 40), lercanidipine (n = 14), candesartan (n = 10), telmisartan (n = 4) and valsartan (n = 10) in inpatients were above the patient specific lower DRC confirming adherence. Of 42 outpatients the identification of analytes in urine as well as the quantification in serum exhibited differing results. According to urinalysis, adherence was demonstrated in only 87.0% of prescriptions, compared to 91.3% for serum analyses. Differences were observed for amlodipine, lercanidipine and candesartan which can be explained by a higher specificity of the serum analysis approach due to pharmacokinetics. The present study confirms that assessing adherence based on serum drug concentrations with individually calculated lower DRCs is more accurate than using qualitative urine analysis. In particular, drugs with low bioavailability, low renal excretion or high metabolism rate such as lercanidipine and candesartan may lead to underestimation of adherence via urine analysis.
Emerging evidence suggests a complex relationship between sphingosine 1-phosphate (S1P) signaling and stroke. Here, we show the kinetics of S1P in the acute phase of ischemic stroke and highlight accompanying changes in immune cells and S1P receptors (S1PR). Using a C57BL/6 mouse model of middle cerebral artery occlusion (MCAO), we assessed S1P concentrations in the brain, plasma, and spleen. We found a steep S1P gradient from the spleen towards the brain. Results obtained by qPCR suggested that cells expressing the S1PR type 1 (S1P1+) were the predominant population deserting the spleen. Here, we report the cerebral recruitment of T helper (TH) and regulatory T (TREG) cells to the ipsilateral hemisphere, which was associated with differential regulation of cerebral S1PR expression patterns in the brain after MCAO. This study provides insight that the S1P-S1PR axis facilitates splenic T cell egress and is linked to the cerebral recruitment of S1PR+ TH and TREG cells. Further insights by which means the S1P-S1PR-axis orchestrates neuronal positioning may offer new therapeutic perspectives after ischemic stroke.
Background: Many patients suffering from exercise-induced asthma (EIA) have normal lung function at rest and show symptoms and a decline in FEV1 when they do sports or during exercise-challenge. It has been described that long-chain polyunsaturated fatty acids (LCPUFA) could exert a protective effect on EIA.
Methods: In this study the protective effect of supplementation with a special combination of n-3 and n-6 LCPUFA (sc-LCPUFA) (total 1.19 g/ day) were investigated in an EIA cold air provocation model. Primary outcome measure: Decrease in FEV1 after exercise challenge and secondary outcome measure: anti-inflammatory effects monitored by exhaled NO (eNO) before and after sc-LCPUFA supplementation versus placebo.
Results: Ninety-nine patients with exercise-induced symptoms aged 10 to 45 were screened by a standardized exercise challenge in a cold air chamber at 4 °C. Seventy-three patients fulfilled the inclusion criteria of a FEV1 decrease > 15% and were treated double-blind placebo-controlled for 4 weeks either with sc-LCPUFA or placebo. Thirty-two patients in each group completed the study. Mean FEV1 decrease after cold air exercise challenge and eNO were unchanged after 4 weeks sc-LCPUFA supplementation.
Conclusion: Supplementation with sc-LCPUFA at a dose of 1.19 g/d did not have any broncho-protective and anti-inflammatory effects on EIA.
Trial registration: Clinical trial registration number: NCT02410096. Registered 7 February 2015 at Clinicaltrial.gov
SARS-CoV-2 is the causative agent of COVID-19. Severe COVID-19 disease has been associated with disseminated intravascular coagulation and thrombosis, but the mechanisms underlying COVID-19-related coagulopathy remain unknown. The risk of severe COVID-19 disease is higher in males than in females and increases with age. To identify gene products that may contribute to COVID-19-related coagulopathy, we analyzed the expression of genes associated with the Gene Ontology (GO) term “blood coagulation” in the Genotype-Tissue Expression (GTEx) database and identified four procoagulants, whose expression is higher in males and increases with age (ADAMTS13, F11, HGFAC, KLKB1), and two anticoagulants, whose expression is higher in females and decreases with age (C1QTNF1, SERPINA5). However, the expression of none of these genes was regulated in a proteomics dataset of SARS-CoV-2-infected cells and none of the proteins have been identified as a binding partner of SARS-CoV-2 proteins. Hence, they may rather generally predispose individuals to thrombosis without directly contributing to COVID-19-related coagulopathy. In contrast, the expression of the procoagulant transferrin (not associated to the GO term “blood coagulation”) was higher in males, increased with age, and was upregulated upon SARS-CoV-2 infection. Hence, transferrin warrants further examination in ongoing clinic-pathological investigations.
miR-142-3p expression is predictive for severe traumatic brain injury (TBI) in trauma patients
(2020)
Background: Predictive biomarkers in biofluids are the most commonly used diagnostic method, but established markers in trauma diagnostics lack accuracy. This study investigates promisingmicroRNAs(miRNA)releasedfromaffectedtissueafterseveretraumathathavepredictive values for the effects of the injury.
Methods: A retrospective analysis of prospectively collected data and blood samples of n = 33 trauma patients (ISS≥16) is provided. Levels of miR-9-5p, -124-3p, -142-3p, -219a-5p, -338-3pand-423-3p inseverelyinjuredpatients (PT)withouttraumatic braininjury (TBI) or with severe TBI (PT + TBI) and patients with isolated TBI (isTBI) were measured within 6 h after trauma.
Results: The highest miR-423-3p expression was detected in patients with severe isTBI, followed by patients with PT + TBI, and lowest levels were found in PT patients without TBI (2−∆∆Ct,p = 0.009). ApositivecorrelationbetweenmiR-423-3plevelandincreasingAIShead (p = 0.001) and risk of mortality (RISC II, p = 0.062) in trauma patients (n = 33) was found. ROC analysis of miR-423-3p levels revealed them as statistically significant to predict the severity of brain injury in trauma patients (p = 0.006). miR-124-3p was only found in patients with severe TBI, miR-338-3p was shown in all trauma groups. miR-9-5p, miR-142-3p and miR-219a-5p could not be detected in any of the four groups. Conclusion: miR-423-3p expression is significantly elevated after isolated traumatic braininjuryandpredictableforsevereTBIinthefirsthoursaftertrauma. miR-423-3pcouldrepresent a promising new biomarker to identify severe isolated TBI.
A message from the human placenta: structural and immunomodulatory defense against SARS-CoV-2
(2020)
The outbreak of the coronavirus disease 2019 (COVID-19) pandemic has caused a global public health crisis. Viral infections may predispose pregnant women to a higher rate of pregnancy complications, including preterm births, miscarriage and stillbirth. Despite reports of neonatal COVID-19, definitive proof of vertical transmission is still lacking. In this review, we summarize studies regarding the potential evidence for transplacental transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), characterize the expression of its receptors and proteases, describe the placental pathology and analyze virus-host interactions at the maternal-fetal interface. We focus on the syncytium, the barrier between mother and fetus, and describe in detail its physical andstructuraldefenseagainstviralinfections. Wefurtherdiscussthepotentialmolecularmechanisms, whereby the placenta serves as a defense front against pathogens by regulating the interferon type III signaling, microRNA-triggered autophagy and the nuclear factor-κB pathway. Based on these data, we conclude that vertical transmission may occur but rare, ascribed to the potent physical barrier, the fine-regulatedplacentalimmunedefenseandmodulationstrategies. Particularly,immunomodulatory mechanismsemployedbytheplacentamaymitigateviolentimmuneresponse,maybesoftencytokine storm tightly associated with severely ill COVID-19 patients, possibly minimizing cell and tissue damages, and potentially reducing SARS-CoV-2 transmission.
Chronic treatment with the mTOR inhibitor, everolimus, fails long-term in preventing tumor growth and dissemination in cancer patients. Thus, patients experiencing treatment resistance seek complementary measures, hoping to improve therapeutic efficacy. This study investigated metastatic characteristics of bladder carcinoma cells exposed to everolimus combined with the isothiocyanate sulforaphane (SFN), which has been shown to exert cancer inhibiting properties. RT112, UMUC3, or TCCSUP bladder carcinoma cells were exposed short- (24 h) or long-term (8 weeks) to everolimus (0.5 nM) or SFN (2.5 µM), alone or in combination. Adhesion and chemotaxis along with profiling details of CD44 receptor variants (v) and integrin α and β subtypes were evaluated. The functional impact of CD44 and integrins was explored by blocking studies and siRNA knock-down. Long-term exposure to everolimus enhanced chemotactic activity, whereas long-term exposure to SFN or the SFN-everolimus combination diminished chemotaxis. CD44v4 and v7 increased on RT112 cells following exposure to SFN or SFN-everolimus. Up-regulation of the integrins α6, αV, and β1 and down-regulation of β4 that was present with everolimus alone could be prevented by combining SFN and everolimus. Down-regulation of αV, β1, and β4 reduced chemotactic activity, whereas knock-down of CD44 correlated with enhanced chemotaxis. SFN could, therefore, inhibit resistance-related tumor dissemination during everolimus-based bladder cancer treatment.
Die Prognose eines malignen Glioms ist trotz verschiedener Therapiemöglichkeiten noch immer sehr schlecht. Zwar hat sich für die Primärsituation seit 2005 eine Standardtherapie etabliert, doch im Rezidivfall fehlt es weiterhin an einer einheitlichen Behandlung. Das Ziel dieser retrospektiven Datenerfassung war es, den prognostischen Stellenwert klinisch- pathologischer Parameter zu vergleichen und eine Konsensempfehlung zu erarbeiten. Zusätzlich wurde ein Teil dieser Daten im Rahmen einer multizentrischen retrospektiven Analyse des DKTKs zur Validierung des im Zuge dessen entwickelten prognostischen RRRSs erhoben und verwendet.
Grundlage dafür bildeten die in der internen Datenbank „Orbis“ und in archivierten Patientenakten gespeicherten Daten von Patienten, die zwischen 07/2009 und 02/2017 in der Klinik für Strahlentherapie am Universitätsklinikum Frankfurt am Main therapiert wurden. Hierbei handelte es sich um Patienten mit einem histologisch gesicherten Glioblastomen WHO Grad IV zum Zeitpunkt der ReRT. Die mediane Gesamtdosis betrug 28 Gy (20-60 Gy), die mediane Einzeldosis 3,5 Gy/Tag (1,8-4 Gy).
Es wurden 102 Patienten eingeschlossen, wobei zwei Patienten als primäre Diagnose ein niedriggradiges Gliom WHO Grad I/II, sechs ein Astrozytom WHO Grad III und 96 ein Glioblastomen WHO Grad IV aufwiesen. Das durchschnittliche Alter betrug 55 Jahre und die mittlere Zeit zwischen initialer und erneuter RT 21,07 Monate. Im Rezidivfall unterzogen sich 40 Patienten einer chirurgischen Intervention, bei welcher es sich in 32 der Fälle um eine totale und acht Mal um eine subtotale Resektion handelte. Des Weiteren erhielten 52 der Patienten eine Chemotherapie mit Temozolomid, 20 eine mit CCNU, 17 mit Avastin und fünf bzw. acht ein anderes oder kein Chemotherapeutikum.
Das mOS nach initialer Diagnosestellung eines malignen Glioms ergab 42,64 Monaten, das progressionsfreie Überleben 14,77 Monate. Das mOS nach der ReRT lag bei 11,8 Monaten und der mediane Zeitraum bis zu einem erneuten Progress betrug 4,25 Monate.
Bezüglich der Primärdiagnose konnten die initiale Histologie (p = 0,002), das Alter (p = 0,016) und der MGMT-Promotor-Status (p = 0,001) als statistisch signifikante Einflussfaktoren identifiziert werden. Demnach wiesen jüngere Patienten mit einer niedriggradigeren Histologie sowie einer Hypermethylierung des MGMT-Promotors eine bessere Prognose auf. Der KPS (p < 0,001), die Zeit zwischen erster und zweiter Bestrahlung (p = 0,003), der MGMT-Promotor-Status (p = 0,025) und das Tumorwachstum (p = 0,024) waren determinante Faktoren hinsichtlich des Outcomes nach der ReRT. Außerdem zeigte sich, dass eine Gesamtstrahlendosis von mehr als 28,90 Gy auf statistisch signifikante Art und Weise (p = 0,042) mit einem längeren OS nach erneuter RT assoziiert war, sowie eine Parietal- bzw. Temporallappenlokalisation (p = 0,009) mit einem längeren progressionsfreien Überleben. Was die Therapiemodalitäten angeht, zeigte sich keine der anderen überlegen.
Die erneute Validierung dieser Daten mit dem RRRS ergab ebenfalls ein statistisch signifikantes Ergebnis bezogen auf die durchschnittliche Überlebenszeit zwischen den einzelnen prognostischen Gruppen ab dem Zeitpunkt der ReRT.
Die Ergebnisse dieser Arbeit legen dar, dass noch immer keine optimale Therapie für Patienten mit rezidivierendem Glioblastomen existiert und weiterhin Forschungsbedarf in der Modifizierung bestehender Behandlungsoptionen sowie in der Entwicklung neuer Therapiemöglichkeiten besteht. Des Weiteren unterstreichen sie die Wichtigkeit und den Wert spezifischer Einflussfaktoren zur Prognoseabschätzung und die Notwendigkeit des Einschlusses bedeutender neuer molekularer Marker anhand der WHO- Klassifikation von 2016 für zukünftige Studien.
Depletion of yeast/fly Ataxin-2 rescues TDP-43 overexpression toxicity. In mouse models of Amyotrophic Lateral Sclerosis via TDP-43 overexpression, depletion of its ortholog ATXN2 mitigated motor neuron degeneration and extended lifespan from 25 days to >300 days. There is another ortholog in mammals, named ATXN2L (Ataxin-2-like), which is almost uncharacterized but also functions in RNA surveillance at stress granules. We generated mice with Crispr/Cas9-mediated deletion of Atxn2l exons 5-8, studying homozygotes prenatally and heterozygotes during aging. Our novel findings indicate that ATXN2L absence triggers mid-gestational embryonic lethality, affecting female animals more strongly. Weight and development stages of homozygous mutants were reduced. Placenta phenotypes were not apparent, but brain histology showed lamination defects and apoptosis. Aged heterozygotes showed no locomotor deficits or weight loss over 12 months. Null mutants in vivo displayed compensatory efforts to maximize Atxn2l expression, which were prevented upon nutrient abundance in vitro. Mouse embryonal fibroblast cells revealed more multinucleated giant cells upon ATXN2L deficiency. In addition, in human neural cells, transcript levels of ATXN2L were induced upon starvation and glucose and amino acids exposure, but this induction was partially prevented by serum or low cholesterol administration. Neither ATXN2L depletion triggered dysregulation of ATXN2, nor a converse effect was observed. Overall, this essential role of ATXN2L for embryogenesis raises questions about its role in neurodegenerative diseases and neuroprotective therapies.
Manufacturing processes of custom implant abutments may contaminate their surfaces with micro wear deposits and generic pollutants. Such particulate debris, if not removed, might be detrimental and provoke inflammatory reactions in peri-implant tissues. Although regulatory guidelines for adequate cleaning, disinfection, or sterilization exist, there does not appear to be a consistent application and data on the amount and extent of such contaminants is lacking. The aim of the present in vitro study was to evaluate the quality and quantity of processing-related surface contamination of computer-aided design/computer-aided manufacturing (CAD/CAM) abutments in the state of delivery and after ultrasonic cleaning. A total of 28 CAD/CAM monotype and hybrid abutments were cleaned and disinfected applying a three-stage ultrasonic protocol (Finevo protocol). Before and after cleaning, the chemical composition and the contamination of the abutments were assessed using scanning electron microscopy (SEM), dispersive X-ray spectroscopy(EDX),andcomputer-aidedplanimetricmeasurement(CAPM).Inthedeliverycondition, monotype abutments showed a significantly higher amount of debris compared to hybrid abutments (4.86±6.10% vs. 0.03 ± 0.03%, p < 0.001). The polishing process applied in the laboratory after bonding the hybrid abutment components reduces the surface roughness and thus contributes substantially to their purity. The extent of contamination caused by computer-aided manufacturing of custom abutments can be substantially minimized using a three-stage ultrasonic protocol.
Alcoholism is one of the leading and increasingly prevalent reasons of liver associated morbidity and mortality worldwide. Alcoholic hepatitis (AH) constitutes a severe disease with currently no satisfying treatment options. Lipoxin A4 (LXA4), a 15-lipoxygenase (ALOX15)-dependent lipid mediator involved in resolution of inflammation, showed promising pre-clinical results in the therapy of several inflammatory diseases. Since inflammation is a main driver of disease progression in alcoholic hepatitis, we investigated the impact of endogenous ALOX15-dependent lipid mediators and exogenously applied LXA4 on AH development. A mouse model for alcoholic steatohepatitis (NIAAA model) was tested in Alox12/15+/+ and Alox12/15−/− mice, with or without supplementation of LXA4. Absence of Alox12/15 aggravated parameters of liver disease, increased hepatic immune cell infiltration in AH, and elevated systemic neutrophils as a marker for systemic inflammation. Interestingly, i.p. injections of LXA4 significantly lowered transaminase levels only in Alox12/15−/− mice and reduced hepatic immune cell infiltration as well as systemic inflammatory cytokine expression in both genotypes, even though steatosis progressed. Thus, while LXA4 injection attenuated selected parameters of disease progression in Alox12/15−/− mice, its beneficial impact on immunity was also apparent in Alox12/15+/+ mice. In conclusion, pro-resolving lipid mediators may be beneficial to reduce inflammation in alcoholic hepatitis.
Autism spectrum disorders (ASD) are highly heritable and are characterized by deficits in social communication and restricted and repetitive behaviors. Twin studies on phenotypic subdomains suggest a differing underlying genetic etiology. Studying genetic variation explaining phenotypic variance will help to identify specific underlying pathomechanisms. We investigated the effect of common variation on ASD subdomains in two cohorts including >2500 individuals. Based on the Autism Diagnostic Interview-Revised (ADI-R), we identified and confirmed six subdomains with a SNP-based genetic heritability h2SNP = 0.2–0.4. The subdomains nonverbal communication (NVC), social interaction (SI), and peer interaction (PI) shared genetic risk factors, while the subdomains of repetitive sensory-motor behavior (RB) and restricted interests (RI) were genetically independent of each other. The polygenic risk score (PRS) for ASD as categorical diagnosis explained 2.3–3.3% of the variance of SI, joint attention (JA), and PI, 4.5% for RI, 1.2% of RB, but only 0.7% of NVC. We report eight genome-wide significant hits—partially replicating previous findings—and 292 known and novel candidate genes. The underlying biological mechanisms were related to neuronal transmission and development. At the SNP and gene level, all subdomains showed overlap, with the exception of RB. However, no overlap was observed at the functional level. In summary, the ADI-R algorithm-derived subdomains related to social communication show a shared genetic etiology in contrast to restricted and repetitive behaviors. The ASD-specific PRS overlapped only partially, suggesting an additional role of specific common variation in shaping the phenotypic expression of ASD subdomains.
Recent studies suggested an important contribution of sphingosine-1-phospate (S1P) signaling via its specific receptors (S1PRs) in the production of pro-inflammatory mediators such as Interleukin (IL)-1β in cancer and inflammation. In an inflammation-driven cancer setting, we previously reported that myeloid S1PR1 signaling induces IL-1β production by enhancing NLRP3 (NOD-, LRR- and Pyrin Domain-Containing Protein 3) inflammasome activity. However, the autocrine role of S1P and enzymes acting on the S1P rheostat in myeloid cells are unknown. Using human and mouse macrophages with pharmacological or genetic intervention we explored the relative contribution of sphingosine kinases (SPHKs) in NLRP3 inflammasome activity regulation. We noticed redundancy in SPHK1 and SPHK2 activities towards macrophage NLRP3 inflammasome transcriptional induction and IL-1β secretion. However, pharmacological blockade of both kinases in unison completely abrogated NLRP3 inflammasome induction and IL-1β secretion. Interestingly, human and mouse macrophages demonstrate varied responses towards SPHKs inhibition and IL-1β secretion. Clinical datasets of renal cell carcinoma and psoriasis patients showed a positive correlation between enzymes affecting the S1P rheostat with NLRP3 inflammasome components expression, which corroborates our finding. Our data provide a better understanding on the role of SPHKs and de novo synthesized S1P in macrophage NLRP3 inflammasome activation
Bei der Aufmerksamkeitsdefizit-/Hyperaktivitätsstörung (ADHS) handelt es sich um eine hochprävalente Erkrankung, die bisher insbesondere im Erwachsenenalter nur unzureichend berücksichtigt wurde. Neben den Kernsymptomen bestehend aus Einschränkungen in der Aufmerksamkeit sowie einem erhöhten Maß an Hyperaktivität und Impulsivität gilt es, Komorbiditäten und Beeinträchtigungen zu berücksichtigen, die mit dieser Erkrankung einhergehen. In früheren Studien konnte bereits nachgewiesen werden, dass sowohl Kinder als auch Erwachsene mit einer ADHS vermehrte Unfälle und infolgedessen eine erhöhte Rate an stationären Behandlungen aufweisen. Zusätzlich besteht bei ADHS-Betroffenen ein höheres Risiko, frühzeitig zu versterben, wobei Unfälle als unnatürliche Todesursache den häufigsten Grund darstellen. Bisher existieren auf internationaler Ebene einige Studien, die sich mit den Zusammenhängen von adulter ADHS und Unfallraten beschäftigten. Eine differenzierte Betrachtung, die eine deutsche Population einschließt und den Einfluss des Geschlechts auf das Unfallgeschehen bei ADHS-Betroffenen untersucht, wurde bisher nicht realisiert. Aus diesen Gründen führten wir eine Querschnittsstudie auf unfallchirurgischen Stationen an zwei Kliniken in Frankfurt am Main durch. Im Rahmen der Studie sollte die Prävalenz von adulter ADHS bei stationär betreuten Unfallopfern ermittelt und mögliche unfallcharakteristische Unterschiede zwischen den Geschlechtern der ADHS-Positivkohorte erfasst werden.
Mithilfe der etablierten Adult ADHD Self-Report Scale (ASRS v1.1) der WHO wurden alle Unfallopfer, die den Einschlusskriterien entsprachen, auf adulte ADHS gescreent. Bei der Auswertung des ASRS verwendeten wir zwei unterschiedliche Methoden, die bereits in früheren Studien zur Anwendung kamen. Durch einen eigens erstellten Unfallfragebogen konnten Unfallcharakteristika sowie psychische Komorbiditäten der ADHSPositivkohorte erfasst werden. Zusätzlich erhoben wir zum Vergleich die Unfallcharakteristika bei einer nicht von ADHS betroffenen Kontrollgruppe. Bei einem Teil der positiv gescreenten Patienten wurde eine ausführliche Testung in der ADHS Spezialambulanz des Universitätsklinikums Frankfurt am Main vorgenommen. Mittels diagnostischer Interviews und weiteren Selbstauskunftsfragebögen (DIVA, HASE) konnte eine definitive ADHS-Diagnose gestellt und das positive Screeningergebnis verifiziert werden.
Wir stellten fest, dass die Prävalenz adulter ADHS unter Unfallopfern mit 6,89 % bzw. 8,68 % in Abhängigkeit der ASRS Auswertungskriterien im Vergleich zu der Prävalenz der adulten ADHS in der Allgemeinbevölkerung erhöht war. Des Weiteren gab es mehr Männer mit einem positiven ADHS-Screeningergebnis und einem Unfallgeschehen. Es konnten keine signifikanten geschlechtsspezifischen Unterschiede in den Unfallcharakteristika und Unfallorten in der ADHS Positivkohorte festgestellt werden. Auch in dem Vorhandensein psychischer Komorbiditäten unterschieden sich die beiden Geschlechtergruppen der ADHS-Positivkohorte nicht. Unabhängig der Geschlechterzugehörigkeit wurden die meisten Unfälle der ADHS-Positivkohorte im Straßenverkehr verzeichnet und als selbstverschuldet eingestuft. Es konnten signifikant mehr Unfälle außerhalb des Straßenverkehrs in der nicht von ADHS betroffenen Kontrollgruppe im Vergleich zu der ADHS Positivkohorte nachgewiesen werden. Insgesamt war nur bei 14 % aller positiv gescreenten Patienten eine ADHS-Erkrankung bereits bekannt und diagnostiziert worden.
Auf Grundlage der Ergebnisse dieser Studie lässt sich schlussfolgern, dass Menschen mit einer ADHS-Symptomatik vermehrt auf unfallchirurgischen Stationen anzutreffen sind und im Einklang mit früheren Forschungsergebnissen ein erhöhtes Unfall- und Verletzungsrisiko aufweisen. Darüber hinaus folgern wir aus unseren Ergebnissen, dass sich Männer und Frauen mit einer ADHS-Erkrankung hinsichtlich Symptomatik, Komorbidität und spezifischer Unfallcharakteristika ähnlicher sein könnten, als dass sie sich in diesen Bereichen unterscheiden. Im Hinblick auf die geringen vorbestehenden ADHS-Diagnosen in der Positivkohorte erscheint eine Etablierung eines Screeningsystems bei Patienten sinnvoll, die im Rahmen von Unfallgeschehen gehäuft stationär betreut werden müssen. Da ADHS-Betroffene ein erhöhtes Risiko für multiple Unfälle zu haben scheinen, könnte unter diesen Voraussetzungen eine adulte ADHS-Symptomatik früher erkannt und negative Folgen wie eine erhöhte Unfallrate reduziert werden. Methodologische Limitierungen bestanden in unserer Erhebung durch eine geringe Anzahl an ausführlichen Testungen zur Verifizierung der ADHS-Diagnose sowie dem Informationsgewinn auf der Basis einer Selbstauskunft. Um Ergebnisse aussagekräftiger zu gestalten und auch kleinere Unfälle zu erfassen, erscheint eine Ausweitung der Testung in Ambulanzen sinnvoll.
In der durchgeführten Studie erfolgte die Untersuchung des visuellen Arbeits-gedächtnisses von bipolaren Patienten im Vergleich zu gesunden Kontrollen. Es erfolgten bereits viele Untersuchungen an Patienten mit bipolarer Störung. Wird das Hauptaugenmerk auf die kognitiven Funktionen der Patienten gelegt, so konnte bereits in einigen Studien gezeigt werden, dass nicht nur in depressi-ver oder manischer, sondern auch in euthymer Stimmungslage kognitive Defizi-te vorliegen. Zur näheren Untersuchung der Funktionen des visuellen Arbeits-gedächtnisses der Patienten mit bipolarer Störung wurde daher eine fMRT-Untersuchung durchgeführt. Hier wurden Patienten, die an bipolarer Störung erkrankt sind, mit gesunden Kontrollen verglichen. Dabei wurden die bipolaren Patienten in euthymer Stimmungslage untersucht. Weder in Antwortrichtigkeit noch Reaktionsgeschwindigkeit konnte ein signifikanter Gruppenunterschied nachgewiesen werden. Außerdem wurde in der Untersuchung eine Differenzie-rung zwischen den einzelnen Phasen gemacht, die eine Gedächtnisinformation durchläuft. Bei diesen Phasen handelt es sich um Enkodierungs-, Halte- und Abrufphase. Hierbei konnten veränderte Aktivierungsmuster an diversen Hirn-strukturen der bipolaren Patienten dargestellt werden. Diese Veränderungen ziehen sich durch alle drei Phasen der Gedächtniskonsolidierung und können vor allem im präfrontalen Kortex nachgewiesen werden. Es handelt sich dabei vor allem um eine schwächere Aktivierung des präfrontalen Kortex (PFC) der bipolaren Patienten im Vergleich zu gesunden Kontrollen. Unter anderem ist das Arbeitsgedächtnis im PFC lokalisiert. Diese Ergebnisse scheinen ein Hin-weis dafür zu sein, dass bei den bipolaren Patienten neuronale Defizite im visu-ellen Arbeitsgedächtnis vorliegen.
Pulmonary failure is the main cause of morbidity and mortality in the human chromosomal instability syndrome Ataxia-telangiectasia (A-T). Major phenotypes include recurrent respiratory tract infections and bronchiectasis, aspiration, respiratory muscle abnormalities, interstitial lung disease, and pulmonary fibrosis. At present, no effective pulmonary therapy for A-T exists. Cell therapy using adipose-derived mesenchymal stromal/stem cells (ASCs) might be a promising approach for tissue regeneration. The aim of the present project was to investigate whether ASCs migrate into the injured lung parenchyma of Atm-deficient mice as an indication of incipient tissue damage during A-T. Therefore, ASCs isolated from luciferase transgenic mice (mASCs) were intravenously transplanted into Atm-deficient and wild-type mice. Retention kinetics of the cells were monitored using in vivo bioluminescence imaging (BLI) and completed by subsequent verification using quantitative real-time polymerase chain reaction (qRT-PCR). The in vivo imaging and the qPCR results demonstrated migration accompanied by a significantly longer retention time of transplanted mASCs in the lung parenchyma of Atm-deficient mice compared to wild type mice. In conclusion, our study suggests incipient damage in the lung parenchyma of Atm-deficient mice. In addition, our data further demonstrate that a combination of luciferase-based PCR together with BLI is a pivotal tool for tracking mASCs after transplantation in models of inflammatory lung diseases such as A-T.
Progressive bladder cancer growth is associated with abnormal activation of the mammalian target of the rapamycin (mTOR) pathway, but treatment with an mTOR inhibitor has not been as effective as expected. Rather, resistance develops under chronic drug use, prompting many patients to lower their relapse risk by turning to natural, plant-derived products. The present study was designed to evaluate whether the natural compound, sulforaphane (SFN), combined with the mTOR inhibitor everolimus, could block the growth and proliferation of bladder cancer cells in the short- and long-term. The bladder cancer cell lines RT112, UMUC3, and TCCSUP were exposed short- (24 h) or long-term (8 weeks) to everolimus (0.5 nM) or SFN (2.5 µM) alone or in combination. Cell growth, proliferation, apoptosis, cell cycle progression, and cell cycle regulating proteins were evaluated. siRNA blockade was used to investigate the functional impact of the proteins. Short-term application of SFN and/or everolimus resulted in significant tumor growth suppression, with additive inhibition on clonogenic tumor growth. Long-term everolimus treatment resulted in resistance development characterized by continued growth, and was associated with elevated Akt-mTOR signaling and cyclin-dependent kinase (CDK)1 phosphorylation and down-regulation of p19 and p27. In contrast, SFN alone or SFN+everolimus reduced cell growth and proliferation. Akt and Rictor signaling remained low, and p19 and p27 expressions were high under combined drug treatment. Long-term exposure to SFN+everolimus also induced acetylation of the H3 and H4 histones. Phosphorylation of CDK1 was diminished, whereby down-regulation of CDK1 and its binding partner, Cyclin B, inhibited tumor growth. In conclusion, the addition of SFN to the long-term everolimus application inhibits resistance development in bladder cancer cells in vitro. Therefore, sulforaphane may hold potential for treating bladder carcinoma in patients with resistance to an mTOR inhibitor.
Treatment of large bone defects is one of the great challenges in contemporary orthopedic and traumatic surgery. Grafts are necessary to support bone healing. A well-established allograft is demineralized bone matrix (DBM) prepared from donated human bone tissue. In this study, a fibrous demineralized bone matrix (f-DBM) with a high surface-to-volume ratio has been analyzed for toxicity and immunogenicity. f-DBM was transplanted to a 5-mm, plate-stabilized, femoral critical-size-bone-defect in Sprague-Dawley (SD)-rats. Healthy animals were used as controls. After two months histology, hematological analyses, immunogenicity as well as serum biochemistry were performed. Evaluation of free radical release and hematological and biochemical analyses showed no significant differences between the control group and recipients of f-DBM. Histologically, there was no evidence of damage to liver and kidney and good bone healing was observed in the f-DBM group. Reactivity against human HLA class I and class II antigens was detected with mostly low fluorescence values both in the serum of untreated and treated animals, reflecting rather a background reaction. Taken together, these results provide evidence for no systemic toxicity and the first proof of no basic immunogenic reaction to bone allograft and no sensitization of the recipient.
Although the therapeutic armamentarium for bladder cancer has considerably widened in the last few years, severe side effects and the development of resistance hamper long-term treatment success. Thus, patients turn to natural plant products as alternative or complementary therapeutic options. One of these is curcumin, the principal component of Curcuma longa that has shown chemopreventive effects in experimental cancer models. Clinical and preclinical studies point to its role as a chemosensitizer, and it has been shown to protect organs from toxicity induced by chemotherapy. These properties indicate that curcumin could hold promise as a candidate for additive cancer treatment. This review evaluates the relevance of curcumin as an integral part of therapy for bladder cancer.
Genetic association studies have shown their usefulness in assessing the role of ion channels in human thermal pain perception. We used machine learning to construct a complex phenotype from pain thresholds to thermal stimuli and associate it with the genetic information derived from the next-generation sequencing (NGS) of 15 ion channel genes which are involved in thermal perception, including ASIC1, ASIC2, ASIC3, ASIC4, TRPA1, TRPC1, TRPM2, TRPM3, TRPM4, TRPM5, TRPM8, TRPV1, TRPV2, TRPV3, and TRPV4. Phenotypic information was complete in 82 subjects and NGS genotypes were available in 67 subjects. A network of artificial neurons, implemented as emergent self-organizing maps, discovered two clusters characterized by high or low pain thresholds for heat and cold pain. A total of 1071 variants were discovered in the 15 ion channel genes. After feature selection, 80 genetic variants were retained for an association analysis based on machine learning. The measured performance of machine learning-mediated phenotype assignment based on this genetic information resulted in an area under the receiver operating characteristic curve of 77.2%, justifying a phenotype classification based on the genetic information. A further item categorization finally resulted in 38 genetic variants that contributed most to the phenotype assignment. Most of them (10) belonged to the TRPV3 gene, followed by TRPM3 (6). Therefore, the analysis successfully identified the particular importance of TRPV3 and TRPM3 for an average pain phenotype defined by the sensitivity to moderate thermal stimuli.
NIMA (never-in-mitosis gene A)-related kinase 1 (Nek1) is shown to impact on different cellular pathways such as DNA repair, checkpoint activation, and apoptosis. Its role as a molecular target for radiation sensitization of malignant cells, however, remains elusive. Stably transduced doxycycline (Dox)-inducible Nek1 shRNA HeLa cervix and siRNA-transfected HCT-15 colorectal carcinoma cells were irradiated in vitro and 3D clonogenic radiation survival, residual DNA damage, cell cycle distribution, and apoptosis were analyzed. Nek1 knockdown (KD) sensitized both cell lines to ionizing radiation following a single dose irradiation and more pronounced in combination with a 6 h fractionation (3 × 2 Gy) regime. For preclinical analyses we focused on cervical cancer. Nek1 shRNA HeLa cells were grafted into NOD/SCID/IL-2Rγc−/− (NSG) mice and Nek1 KD was induced by Dox-infused drinking water resulting in a significant cytostatic effect if combined with a 6 h fractionation (3 × 2 Gy) regime. In addition, we correlated Nek1 expression in biopsies of patients with cervical cancer with histopathological parameters and clinical follow-up. Our results indicate that elevated levels of Nek1 were associated with an increased rate of local or distant failure, as well as with impaired cancer-specific and overall survival in univariate analyses and for most endpoints in multivariable analyses. Finally, findings from The Cancer Genome Atlas (TCGA) validation cohort confirmed a significant association of high Nek1 expression with a reduced disease-free survival. In conclusion, we consider Nek1 to represent a novel biomarker and potential therapeutic target for drug development in the context of optimized fractionation intervals.
Non-alcoholic fatty liver disease (NAFLD) is gaining in importance and is linked to obesity. Especially,thedevelopmentoffibrosisandportalhypertensioninNAFLDpatientsrequirestreatment. Transgenic TGR(mREN2)27 rats overexpressing mouse renin spontaneously develop NAFLD with portal hypertension but without obesity. This study investigated the additional role of obesity in this model on the development of portal hypertension and fibrosis. Obesity was induced in twelve-week old TGR(mREN2)27 rats after receiving Western diet (WD) for two or four weeks. Liver fibrosis was assessed using standard techniques. Hepatic expression of transforming growth factor-β1 (TGF-β1), collagen type Iα1, α-smooth muscle actin, and the macrophage markers Emr1, as well as the chemoattractant Ccl2, interleukin-1β (IL1β) and tumor necrosis factor-α (TNFα) were analyzed. Assessment of portal and systemic hemodynamics was performed using the colored microsphere technique. Asexpected,WDinducedobesityandliverfibrosisasconfirmedbySiriusRedandOilRed O staining. The expression of the monocyte-macrophage markers, Emr1, Ccl2, IL1β and TNFα were increasedduringfeedingofWD,indicatinginfiltrationofmacrophagesintotheliver,eventhoughthis increase was statistically not significant for the EGF module-containing mucin-like receptor (Emr1) mRNA expression levels. Of note, portal pressure increased with the duration of WD compared to animals that received a normal chow. Besides obesity, WD feeding increased systemic vascular resistance reflecting systemic endothelial and splanchnic vascular dysfunction. We conclude that transgenic TGR(mREN2)27 rats are a suitable model to investigate NAFLD development with liver fibrosis and portal hypertension. Tendency towards elevated expression of Emr1 is associated with macrophage activity point to a significant role of macrophages in NAFLD pathogenesis, probably due to a shift of the renin–angiotensin system towards a higher activation of the classical pathway. The hepatic injury induced by WD in TGR(mREN2)27 rats is suitable to evaluate different stages of fibrosis and portal hypertension in NAFLD with obesity.
Background: The purpose of this pilot study was to create a valid and reliable set of assessment questions for examining Evidence-based Dentistry (EbD) knowledge. For this reason, we adapted and validated for dental students the Berlin Questionnaire (BQ), which assesses Evidence-based Medicine (EbM) abilities.
Methods: The Berlin Questionnaire was validated with medical residents. We adapted it for use in a dentistry setting. An expert panel reviewed the adapted BQ for content validity. A cross-sectional cohort representing four training levels (EbD-novice dental students, EbD-trained dental students, dentists, and EbM−/EbD-expert faculty) completed the questionnaire. A total of 140 participants comprised the validation set. Internal reliability, item difficulty and item discrimination were assessed. Construct validity was assessed by comparing the mean total scores of students to faculty and comparing proportions of students and faculty who passed each item.
Results: Among the 133 participants (52 EbD-novice dental students, 53 EbD-trained dental students, 12 dentists, and 16 EbM-/ EbD-expert faculty), a statistically significant (p < 0.001) difference was evident in the total score corresponding to the training level. The total score reliability and psychometric properties of items modified for discipline-specific content were acceptable. Cronbach’s alpha was 0.648.
Conclusion: The adapted Berlin Questionnaire is a reliable and valid instrument to assess competence in Evidence-based Dentistry in dental students. Future research will focus on refining the instrument further.
Background: Radiotherapy dose and target volume prescriptions for anal squamous cell carcinoma (ASCC) vary considerably in daily practice and guidelines, including those from NCCN, UK, Australasian, and ESMO. We conducted a pattern-of-care survey to assess the patient management in German speaking countries.
Methods: We developed an anonymous questionnaire comprising 18 questions on diagnosis and treatment of ASCC. The survey was sent to 361 DEGRO-associated institutions, including 41 university hospitals, 118 non-university institutions, and 202 private practices.
Results: We received a total of 101 (28%) surveys, including 20 (19.8%) from university, 36 (35.6%) from non-university clinics, and 45 (44.6%) from private practices. A total of 28 (27.8%) institutions reported to treat more than 5 patients with early-stage ASCC and 42 (41.6%) institutions treat more than 5 patients with locoregionally-advanced ASCC per year. Biopsy of suspicious inguinal nodes was advocated in only 12 (11.8%) centers. Screening for human immunodeficiency virus (HIV) is done in 28 (27.7%). Intensity modulated radiotherapy or similar techniques are used in 97%. The elective lymph node dose ranged from 30.6 Gy to 52.8 Gy, whereas 87% prescribed 50.4–55. 8 Gy (range: 30.6 to 59.4 Gy) to the involved lymph nodes. The dose to gross disease of cT1 or cT2 ASCC ranged from 50 to ≥60 Gy. For cT3 or cT4 tumors the target dose ranged from 54 Gy to more than 60 Gy, with 76 (75.2%) institutions prescribing 59.4 Gy. The preferred concurrent chemotherapy regimen was 5-FU/Mitomycin C, whereas 6 (6%) prescribed Capecitabine/Mitomycin C. HIV-positive patients are treated with full-dose CRT in 87 (86.1%) institutions. First assessment for clinical response is reported to be performed at 4–6 weeks after completion of CRT in 2 (2%) institutions, at 6–8 weeks in 20 (19.8%), and 79 (78%) institutions wait up to 5 months.
Conclusions: We observed marked differences in radiotherapy doses and treatment technique in patients with ASCC, and also variable approaches for patients with HIV. These data underline the need for an consensus treatment guideline for ASCC.
Objective: Phenotypic (Sensititre Myco, pDST) and genotypic drug susceptibility testing (GenoType NTM DR, gDST) in M. avium complex (MAC) have become available as standardized assays, but comparable data is needed. This study aimed to investigate the phenotypic and genotypic drug susceptibility patterns in MAC clinical isolates.
Methods: Overall, 98 isolates from 85 patients were included. pDST and gDST were performed on all isolates and results compared regarding specificity and sensitivity using pDST as a reference method. The impact of drug instability on pDST results was studied using a biological assay over 14 days. In addition, the evolution of antimicrobial resistance was investigated in sequential isolates of 13 patients.
Results: Macrolide resistance was rare, 1.2% (95% CI 0.7–7.3) of isolates in the base cohort. No aminoglycoside resistances were found, but 14.1% of the studied isolates (95% CI 7.8–23.8) showed intermediate susceptibility. The GenoType NTM DR identified two out of four macrolide-resistant isolates. Antibiotic stability was demonstrated to be poor in rifampicin, rifabutin, and doxycycylin.
Conclusions: pDST results in NTM for unstable antibiotics must be interpreted with care. A combination of pDST and gDST will be useful for the guidance of antimicrobial therapy in MAC-disease.
Molecular and cellular research modalities for the study of liver pathologies have been tremendously improved over the recent decades. Advanced technologies offer novel opportunities to establish cell isolation techniques with excellent purity, paving the path for 2D and 3D microscopy and high-throughput assays (e.g., bulk or single-cell RNA sequencing). The use of stem cell and organoid research will help to decipher the pathophysiology of liver diseases and the interaction between various parenchymal and non-parenchymal liver cells. Furthermore, sophisticated animal models of liver disease allow for the in vivo assessment of fibrogenesis, portal hypertension and hepatocellular carcinoma (HCC) and for the preclinical testing of therapeutic strategies. The purpose of this review is to portray in detail novel in vitro and in vivo methods for the study of liver cell biology that had been presented at the workshop of the 8th meeting of the European Club for Liver Cell Biology (ECLCB-8) in October of 2018 in Bonn, Germany.
Objective: To study the effect of total hip replacement (THR) on serum cartilage oligomeric matrix protein concentration (sCOMP) and its correlation with joint loading during gait in patients with unilateral hip osteoarthritis.
Design: In this prospective multimodal (clinical, biomechanical, biochemical) study blood samples from 15 patients were taken before and up to three times after THR (7 days, 3 months and 1 year), each after a resting period of at least 30 min, for analysis of sCOMP. Gait analysis was performed before and 1 year after THR to determine hip and knee joint moments.
Results: Seven days after THR, sCOMP decreased significantly compared to the preoperative measurement (p < 0.001). Three months and 1 year postoperatively, sCOMP reverted to concentrations in the range of the preoperative value. One year postoperatively, a linear correlation between sCOMP and the maximum hip flexion moment was indicated in the first half of the stance phase on the unaffected side (r = −0.736, p = 0.024). No further correlations could be determined.
Conclusions: Surprisingly, the removal of a joint affected by osteoarthritis did not have a sustained effect on sCOMP. Both before and after THR there was no scientifically substantiated correlation between sCOMP and joint moments from gait analysis. Consequently, the examination of sCOMP is not useful to detect altered joint loads that may influence degenerative changes of adjacent joints after THR.
The registration number in the German Registry of Clinical Trials is DRKS00015053.
Background: Experienced and anticipated regret influence physicians’ decision-making. In medicine, diagnostic decisions and diagnostic errors can have a severe impact on both patients and physicians. Little empirical research exists on regret experienced by physicians when they make diagnostic decisions in primary care that later prove inappropriate or incorrect. The aim of this study was to explore the experience of regret following diagnostic decisions in primary care.
Methods: In this qualitative study, we used an online questionnaire on a sample of German primary care physicians. We asked participants to report on cases in which the final diagnosis differed from their original opinion, and in which treatment was at the very least delayed, possibly resulting in harm to the patient. We asked about original and final diagnoses, illness trajectories, and the reactions of other physicians, patients and relatives. We used thematic analysis to assess the data, supported by MAXQDA 11 and Microsoft Excel 2016.
Results: 29 GPs described one case each (14 female/15 male patients, aged 1.5–80 years, response rate < 1%). In 26 of 29 cases, the final diagnosis was more serious than the original diagnosis. In two cases, the diagnoses were equally serious, and in one case less serious. Clinical trajectories and the reactions of patients and relatives differed widely. Although only one third of cases involved preventable harm to patients, the vast majority (27 of 29) of physicians expressed deep feelings of regret.
Conclusion: Even if harm to patients is unavoidable, regret following diagnostic decisions can be devastating for clinicians, making them ‘second victims’. Procedures and tools are needed to analyse cases involving undesirable diagnostic events, so that ‘true’ diagnostic errors, in which harm could have been prevented, can be distinguished from others. Further studies should also explore how physicians can be supported in dealing with such events in order to prevent them from practicing defensive medicine.
Background: Point of care devices for performing targeted coagulation substitution in patients who are bleeding have become increasingly important in recent years. New on the market is the Quantra. It is a device that uses sonorheometry, a sonic estimation of elasticity via resonance, which is a novel ultrasound-based technology that measures viscoelastic properties of whole blood. Several studies have already shown the comparability of the Quantra with devices already established on the market, such as the rotational thromboelastometry (ROTEM) device.
Objective: In contrast to existing studies, this study is the first prospective interventional study using this new system in a cardiac surgical patient cohort. We will investigate the noninferiority between an already existing coagulation algorithm based on the ROTEM/Multiplate system and a new algorithm based on the Quantra system for the treatment of coagulopathic cardiac surgical patients.
Methods: The study is divided into two phases. In an initial observation phase, whole blood samples of 20 patients obtained at three defined time points (prior to surgery, after completion of cardiopulmonary bypass, and on arrival in the intensive care unit) will be analyzed using both the ROTEM/Multiplate and Quantra systems. The obtained threshold values will be used to develop a novel algorithm for hemotherapy. In a second intervention phase, the new algorithm will be tested for noninferiority against an algorithm used routinely for years in our department.
Results: The main objective of the examination is the cumulative loss of blood within 24 hours after surgery. Statistical calculations based on the literature and in-house data suggest that the new algorithm is not inferior if the difference in cumulative blood loss is <150 mL/24 hours.
Conclusions: Because of the comparability of the Quantra sonorheometry system with the ROTEM measurement methods, the existing hemotherapy treatment algorithm can be adapted to the Quantra device with proof of noninferiority.
Trial Registration: ClinicalTrials.gov NCT03902275; https://clinicaltrials.gov/ct2/show/NCT03902275
International Registered Report Identifier (IRRID): DERR1-10.2196/17206
Background: Computerized virtual patients (VP) have spread into many areas of healthcare delivery and medical education. They provide various advantages like flexibility in pace and space of learning, a high degree of teaching reproducibility and a cost effectiveness. However, the educational benefit of VP as an additive or also as an alternative to traditional teaching formats remains unclear. Moreover, there are no randomized-controlled studies that investigated the use of VP in a dental curriculum. Therefore, this study investigates VP as an alternative to lecturer-led small-group teaching in a curricular, randomized and controlled setting.
Methods: Randomized and controlled cohort study. Four VP cases were created according to previously published design principles and compared with lecturer-led small group teaching (SGT) within the Oral and Maxillofacial Surgery clerkship for dental students at the Department for Cranio-, Oral and Maxillofacial Plastic Surgery, Goethe University, Frankfurt, Germany. Clinical competence was measured prior (T0), directly (T1) and 6 weeks (T2) after the intervention using theoretical tests and a self-assessment questionnaire. Furthermore, VP design was evaluated using a validated toolkit.
Results: Fifty-seven students (VP = 32; SGT = 25) agreed to participate in the study. No competence differences were found at T0 (p = 0.56). The VP group outperformed (p < .0001) the SGT group at T1. At T2 there was no difference between both groups (p = 0.55). Both interventions led to a significant growth in self-assessed competence. The VP group felt better prepared to diagnose and treat real patients and regarded VP cases as a rewarding learning experience.
Conclusions: VP cases are an effective alternative to lecture-led SGT in terms of learning efficacy in the short and long-term as well as self-assessed competence growth and student satisfaction. Furthermore, integrating VP cases within a curricular Oral and Maxillofacial Surgery Clerkship is feasible and leads to substantial growth of clinical competence in undergraduate dental students.
Einleitung: Ataxia telangiectasia (A-T) ist eine lebenslimitierende autosomal-rezessiv vererbte Systemerkrankung, die durch eine Mutation im ATM Gen hervorgerufen wird. Symptome wie Neurodegeneration, Immundefizienz, Teleangiektasien, Wachstums- und Gedeihstörungen, endokrine Dysfunktionen, erhöhte Strahlensensitivität, sowie Malignomprädisposition sind charakterisierend für die Erkrankung. Des Weiteren zeigen viele Patienten eine progrediente Lebererkrankung, die bis jetzt nur unzureichend untersucht wurde.
Zielsetzung: Untersuchung der laborchemischen und strukturellen Veränderungen im Rahmen der Hepatopathie bei A-T Patienten. Des Weiteren soll der Zusammenhang der Körperzusammensetzung, der Muskelkraft und der Lebensqualität mit der Lebererkrankung analysiert werden.
Methoden: Von November 2016 bis Mai 2018, wurden 31 A-T Patienten in die Studie eingeschlossen. Die Patienten wurden zur Auswertung in zwei Gruppen eingeteilt (21 Patienten ≤ zwölf Jahre, zehn Patienten > zwölf Jahre). Neben der Bestimmung der Laborparameter wurden die Veränderungen der Leber anhand der transienten Elastographie und des FibroMax® erhoben. Die Körperzusammensetzung wurde mit Hilfe der bioelektrischen Impedanzanalyse (BIA) ermittelt, die Muskelkraft anhand des Five-Times-Sit-to-Stand-Tests (FTSST). Zur Erfassung der Lebensqualität wurde der EuroQol-Fragebogen 5Q-5D-5L durchgeführt.
Ergebnisse: Bei der transienten Elastographie zeigte sich bei zwei (10%) jüngeren im Vergleich zu neun (90%) älteren Patienten eine Steatose. Eine Fibrose lag bei fünf (50%) älteren Patienten vor. Die Leberenzyme (AST (37.8 ± 7.9 U/l vs. 49.8 ± 15.2 U/l, p<0,05), ALT (25.1 ± 9.6 U/l vs. 71.6 ± 25.8 U/l, p<0,001), GGT (13.2 ± 4,5 U/l vs. 123.7 ± 99.6 U/l, p<0,0001)), das Alpha-Fetoprotein (AFP) (313.4 ± 267,2 ng/ml vs. 540.8 ± 275.8 ng/ml, p<0,05), der HbA1c (4,8 ± 0,4 % vs. 5,7 ± 0,6 %, p<0,0001) sowie die Triglyceride (66.5 ± 34.3 mg/dl vs. 200.4 ± 98.8 mg/dl, p<0,0001) waren signifikant in der älteren Patientengruppe erhöht. Zusätzlich zeigte sich eine signifikante Korrelation der Steatose und Fibrose mit dem Alter (r=0,82, p<0,0001; r=0,59, p<0,001), der AST (r=0,39, p<0,05; r=0,42, p<0,05), der ALT (r=0,77, p<0,0001; r=0,53, p<0,01), der
GGT (r=0,83, p<0,0001; r=0,67, p<0,0001), dem HbA1c (r=0,59, p<0,01; r=0,63, p<0,001) und den Triglyceriden (r=0,74, p<0,0001; r=0,62, p<0,001). Die transiente Elastographie und der SteatoTest des FibroMax zeigten übereinstimmende Ergebnisse.
Eine Magermasse unterhalb der zehnten Perzentile wiesen elf (52%) jüngere im Gegensatz zu neun (90%) älteren Patienten auf. Auch der Phasenwinkel lag bei neun (43%) jüngeren und acht (80%) älteren Patienten unterhalb der zehnten Perzentile. Die jüngeren Patienten waren beim FTSST signifikant schneller (10,8 ± 6,1s vs. 19,4 ± 5,6s, p < 0,01). Die Auswertung des EuroQol-Fragebogen 5Q-5D-5L zeigte einen signifikanten Unterschied der Einschätzung der Beweglichkeit / Mobilität der Patienten (3 (1-4) vs. 4 (2-5), p<0,05).
Schlussfolgerung: Eine Hepatopathie im Sinne einer nicht-alkoholische Fettlebererkrankung (NAFLD) bzw. nicht-alkoholische Steatohepatitis (NASH) tritt bei fast allen älteren A-T Patienten auf. Charakteristisch hierfür sind erhöhte Leberenzyme und eine Fettleber bis hin zur Leberfibrose und Zirrhose. Oxidativer Stress, Inflammation und ein partielles metabolisches Syndrom in Form einer Dyslipidämie und Dysglykämie tragen zu diesem Prozess bei. Die Lebererkrankung im Rahmen der A-T sollte regelmäßig qualifiziert erfasst werden, um Langzeitfolgen, wie beispielsweise die Entwicklung eines hepatozellulären Karzinoms rechtzeitig zu detektieren. Die transiente Elastographie stellt hierfür eine gut reproduzierbare, nicht invasive Methode dar, mit der bereits frühe Stadien der Lebererkrankung erkannt werden können.
Es ist wissenschaftlich belegt, dass hohe Feinstaubbelastungen direkt mit gesundheitlichen Schäden vergesellschaftet sind. Insbesondere in Städten, in denen die Konzentrationen besonders hoch sind, stellt dies ein ernstzunehmendes Problem dar . Ein wesentlicher Beitrag der Feinstaubbelastung ist auf anthropogene Prozesse und insbesondere auf verkehrsbedingte Emissionen zurückzuführen. Hierbei sind Abgase aus Verbrennungsmotoren sowie Brems- und Reifenabrieb zu nennen.
Für die gesundheitliche Risikobewertung einzelner Verkehrsteilnehmer werden mehrheitlich Daten stationärer Messnetzwerke herangezogen. Die Aussagekraft dieser Daten für diesen Zweck wird jedoch mitunter kritisch bewertet.
Um die Feinstaubexposition gegenüber einem Fahrzeuginsassen realistischer beurteilen zu können, erfolgt die Messung der Feinstaubkonzentration im Innenraum eines PKW mit einem mobilen Aerosolspektrometer und GPS-gestützter Standortbestimmung in Frankfurt am Main. Hierbei werden die Konzentrationen für die Partikelfraktionen PM10, PM2,5, PM1 und PMcoarse unter unterschiedlichen Bedingungen kontinuierlich gemessen.
Neben einem Vergleich der mobil gemessenen Feinstaubkonzentrationen mit Daten des stationären Messnetzwerks, werden auch lokale Konzentrationsvariationen sowie Expositionsdifferenzen zwischen Fahrten mit geöffnetem und geschlossenem Fenster analysiert.
Um einzelne Feinstaubquellen identifizieren zu können, wird die Fahrzeugumgebung mit einer Videokamera überwacht.
Im Fahrzeuginnenraum wurden Spitzenkonzentrationen von 508 µg m-3 für PM10, 133,9 µg m-3 für PM2,5, 122,9 µg m-3 für PM1 und 109,8 µg m-3 für PMcoarse (2,5-10 µm) erreicht. Die Konzentration und die Partikelgrößenverteilung im Fahrzeuginnenraum waren stark von der Umgebungsluft abhängig. Die Konzentration feinerer Partikel (PM2,5, PM1) zeigte nur geringe Schwankungen innerhalb der Stadt mit einigen signifikanten Spitzen in der Innenstadt und auf stark befahrenen Straßen. Im Gegensatz dazu wies die PMcoarse-Konzentration starke Schwankungen auf. Die höchsten Werte wurden ebenfalls in der Innenstadt und auf stark befahrenen Straßen gemessen. Durch Analyse des Videomaterials war es möglich, einige Konzentrationsspitzen mit ihren charakteristischen Partikelgrößenspektren den jeweiligen Quellen zu zuordnen.
Die absoluten Partikelkonzentrationen unterschieden sich signifikant zwischen den mobilen und den stationären Messungen, obwohl für feinere Partikel gute Korrelationen beobachtet werden konnten. Insbesondere die bei geöffnetem Fenster gemessenen Fahrzeuginnenraumkonzentrationen waren für alle Partikelgrößen deutlich höher als die entsprechenden Werte der Messstation. Schließlich erfolgte ein direkter Vergleich der Feinstaubkonzentrationen im Fahrzeug zwischen Fahrten mit geöffnetem und geschlossenem Fenster. An jedem Tag wurde nach dem Schließen des Fensters eine Konzentrationsreduktion bei allen Größenfraktionen beobachtet. Grobe Partikel (2,5-10 µm) wurden um 87,9 bis 97,4 %, feinere Partikel (1-2,5 µm) um 77,9 bis 88,2 % und die feinsten Partikel (<1 µm) um 13 bis 52 % reduziert.
Nach Interpretation der vorliegenden Daten sind mobile Messungen für eine Risikoanalyse der Feinstaubexposition auf einen Fahrzeuginsassen unerlässlich. Die Partikelkonzentration im PKW war über alle Fahrten hinweg mäßig bis hoch, wobei die Konzentration von groben Partikeln leicht durch Schließen des Fensters und Nutzung der Klimaanlage reduziert werden konnte. Die Konzentration der feineren Partikel konnte durch diese Maßnahmen nur geringfügig herabgesetzt werden.
Basierend auf den vorliegenden Ergebnissen sollte in zukünftigen Studien auf die Quantifizierung ultrafeiner Partikel eingegangen werden sowie eine ergänzende chemische Analyse der Partikel erfolgen.
Einleitung- 12,5% aller operierten Patienten sind für mehr als 80% aller Todesfälle verantwortlich. Über die Identifizierung dieser Risikopatienten ist wenig bekannt.6. Währenddessen sind hepatobiliäre Operationen nach wie vor mit einem relativ hohen Mortalitätsrisiko von etwa 5% assoziiert.15.
Ziel- Die Evaluierung der „Cumulative Illness Rating Scale(CIRS)“ zur Prädiktion von Komplikationen und Mortalität in der hepatobiliären Chirurgie.
Material und Methoden- Alle Patienten, die sich vom 01.01.2011 bis zum 06.05.2016 einer hepatobiliären unterzogen, wurden retrospektiv anhand der elektronischen Patientenakte(NICE) gemäß der modifizierten CIRS46 bewertet. Abhängig von der Gesamtsumme der ermittelten CIRS-Werte wurden die Patienten in 4 Risikoklassen (1-4) unterteilt. Anschließend wurden die 14 CIRS-Kategorien und die Risikoklassen auf ein vermehrtes Auftreten von Komplikationen ≥IIIb50 gemäß der Dindo-Klassifikation sowie der 90-Tages-Mortalität49 untersucht.
Ergebnisse- 576 Patienten mit einem durchschnittlichen Alter von 60,7 ± 13,7 Jahren wurden in die Studie aufgenommen. 18,6% der Patienten wiesen Komplikationen ≥IIIb anhand der Dindo-Klassifikation auf. 6,8% verstarben innerhalb des Überwachungszeitraumes von 90 Tagen. Für die Risikoklassen 3+4 (OR=1,674; p=0,027; 95%CI=1,060-2,645) sowie für Erkrankungen der Schweregrade 3+4 in der Kategorie „Leber“ (OR=2,583; p=0,015; 95%CI=1,205-5,538) konnten signifikant erhöhte Wahrscheinlichkeiten für die Entstehung von Komplikationen festgestellt werden. Gleiches wurde im Bezug auf Mortalität für Erkrankungen der Schweregrade 3+4 in den Kategorien „Hypertonie“ (OR=2,249; p=0,019; 95%CI=1,141-4,434) und „Leber“ (OR=8,891; p=0,033; 95%CI=1,189-66,492) nachgewiesen. Im Gegensatz dazu führten Erkrankungen der Schweregrade 3+4 in der Kategorie „Unterer Gastrointestinaltrakt“ zu einer deutlichen Reduzierung des Risikos für die Entwicklung von Komplikationen (OR=0,385; p<0,000; 95%CI=0,228-0,649) und Mortalität (OR=0,419; p=0,047; 95%CI=0,178-0987). Die im Rahmen der binär logistischen Regression erstellten Regressionsgleichungen ermöglichten keine verbesserte Klassifizierung der Patienten.
Zusammenfassung- Die Ergebnisse zeigen, dass signifikante Zusammenhänge zwischen der Entstehung von Komplikationen ≥IIIb anhand der Dindo-Klassifikation und der 90-Tages-Mortalität mittels CIRS nachweisbar sind. Dennoch geht hervor, dass der prädiktive Wert der modifizierten CIRS für die hepatobiliäre Chirurgie gering ist.
Die Überlebensraten bei Krebspatienten werden dank effektiver Früherkennung und innovativer Therapiemethoden immer höher. Umso wichtiger ist es, die vielen Nebeneffekte der Krankheit und Therapie zu erforschen, um die Patienten bei der Bewältigung ihres Alltags während und nach der Erkrankung optimal zu unterstützen. In den letzten Jahren konnten einige Studien bereits zeigen, dass es kognitive Einschränkungen bei Brustkrebspatientinnen nicht erst nach einer Systemtherapie, sondern schon kurz nach der Diagnose gibt.
Die vorliegende Studie knüpfte an diesem Punkt an und hat untersucht, in wie weit Brustkrebspatientinnen schon vor einer systemischen Chemotherapie von kognitiven Defiziten betroffen sind, insbesondere im Bereich der Aufmerksamkeit und Konzentration, der in früheren Studien als eine der am häufigsten betroffenen kognitiven Fähigkeiten herausgestellt werden konnte.
Es wurde angenommen, dass sowohl die objektiv als auch die subjektiv gemessenen Aufmerksamkeitsleistungen bei Frauen mit Brustkrebs schlechter sind als bei gesunden Kontrollprobandinnen. Weiterhin wurde angenommen, dass die Aufmerksamkeitsleistungen negativ mit dem Grad psychischer Belastungen korrelieren, insbesondere mit Angst- und Depressionssymptomen.
Zur Überprüfung dieser Annahmen wurden 20 Frauen, die kürzlich eine Brustkrebsdiagnose erhalten hatten, mit einer passenden Kontrollgruppe von 20 gesunden Frauen verglichen. Alle Teilnehmerinnen führten nach Erfassung demographischer und medizinischer Informationen einen kurzen Intelligenztest durch und anschließend Messungen, die die objektiven Leistungen im Bereich Aufmerksamkeit und Gedächtnis untersuchten. Diese wurden teils auf dem Papier, teils computerisiert durchgeführt. Nach den objektiven Tests folgte die Selbsteinschätzung von Lebensqualität, Wahrnehmung im Bereich Konzentration und Gedächtnis und ein Screening zu Angst- und Depressionssymptomen.
Wie angenommen, zeigten sich bei den objektiven Ergebnissen der Aufmerksamkeitstests leichte Einschränkungen der Patientinnen gegenüber der Kontrollgruppe. Auch die subjektive Einschätzung der Leistung war signifikant schlechter als bei den gesunden Frauen. Zwischen den Angst- und Depressionswerten und den objektiven Leistungstests ließ sich kein Zusammenhang feststellen, ebenso gab es keine Assoziation zwischen den objektiv und subjektiv erfassten Ergebnissen für Aufmerksamkeit und Konzentration.
Beim Betrachten der Gesamtgruppe zeigte sich jedoch eine signifikante Korrelation zwischen den subjektiv eingeschätzten kognitiven Leistungen und den Werten bei Angst und Depression.
Durch diese Arbeit wurden bisherige Studien in weiten Teilen bestätigt. Die Ergebnisse bei objektiven Tests sind in der aktuellen Literatur noch uneinheitlich. Die vorliegenden Daten weisen darauf hin, dass Frauen mit einer Brustkrebsdiagnose durchaus kognitive Defizite haben können, diese jedoch relativ mild ausfallen. Dass es keinen Zusammenhang zwischen objektiven und subjektiven Ergebnissen gibt, bestätigt ebenfalls aktuelle Forschungsergebnisse. Die Assoziation zwischen den psychischen Belastungen und den selbst wahrgenommenen kognitiven Leistungen zeigt, wie wichtig die Bewältigung von Depression und Angst sind, um den Patientinnen einen selbstständigen Alltag in der Krankheitsphase zu ermöglichen.
Nierensteine sind eine häufige Diagnose, welche Patient und Gesundheitssystem gleichermaßen belasten. In dieser Arbeit sollten deshalb bekannte präoperative und intraoperative Faktoren bestätigt und neue identifiziert werden, welche das Ergebnis bei der endourologischen Steintherapie durch rigide oder flexible Ureterorenoskopie vorhersagen können. Die untersuchten Outcome-Variablen waren die Steinfreiheit, die postoperative Schmerzfreiheit, sowie die ökonomischen Faktoren OP-Zeit und Verweildauer. Ist eine Prädiktion dieser Variablen möglich, so wird der Krankenhausaufenthalt für Patient und Kliniken besser planbar, zudem kann anhand der ökonomischen Faktoren abgeschätzt werden, wie rentabel die Behandlung sein wird. Zu diesem Zweck sollten aus den Prüfvariablen Scores erstellt werden, welche die Steinfreiheit möglichst zuverlässig vorhersagen und bei gleicher Prädiktionskraft einfacher anzuwenden sind als der bekannte S.T.O.N.E. Score zur Abschätzung der Steinfreiheit nach starrer und flexibler URS. Zudem sollten erstmals auch Outcome-Scores für die OP-Zeit, die Verweildauer und die postoperative Schmerzfreiheit erstellt werden.
Hierfür wurden zunächst Patientendaten, sowie radiologische und intraoperative Ergebnisse zusammengetragen und mittels statistischer univariater Analyse auf einen Zusammenhang mit den Outcome-Faktoren überprüft. Hierbei wurden die starre und die flexible URS getrennt analysiert. Im nächsten Schritt wurden in multivariater Analyse die unabhängigen Faktoren identifiziert, welche das Outcome beeinflussen. Aus diesen Variablen wurden schließlich Scores errechnet und deren Prädiktionskraft im Hinblick auf das klinische und ökonomische Outcome nach URS mittels ROC-Analyse untersucht und verglichen. Für die Vorhersage der Steinfreiheit konnte zu jedem Eingriff ein Score erstellt werden, der bei gleicher oder besserer Prädiktionskraft mit weniger Variablen auskommt, als der bisher bekannteste publizierte S.T.O.N.E. Score und somit leichter anzuwenden ist. Der Renewal-Score für die starre URS umfasst die Parameter Steinlänge, Steinlokalisation, Steinanzahl und initiale Notfallvorstellung der Patienten, der Flexfree-Score für die flexible URS beinhaltet hingegen die Steinlänge, eine präinterventionelle DJ-Kathetereinlage und die Erfahrung des Urologen. Auch für die ökonomischen Parameter Operations- und Verweildauer konnten erstmals spezifische Outcome-Scores erstellt werden, lediglich die Schmerzfreiheit ließ sich mit den gesammelten Daten nicht vorhersagen. Bei der flexiblen URS konnte der zur gemeinsamen Prädiktion von OP- und Verweildauer geeignete Fleconomy-Score aus den Variablen Steinbreite und Steinvorgeschichte errechnet werden. Bei der starren URS mussten getrennte Scores erstellt werden. Für die OP-Dauer wurde der Ritime-Score aus den Parametern Steinlänge, Steinbreite, Steinlokalisation und Notfallvorstellung errechnet. Auch der Renewal-Score zur Vorhersage der Steinfreiheit nach rigider URS eignete sich zur Prädiktion der Operationszeit. Der Ristay-Score zur Vorhersage der Verweildauer nach starrer URS umfasst hingegen die Faktoren präoperative DJ-Kathetereinlage, den präinterventionellen Kreatininwert und die OP-Zeit. Auch die ökonomischen Tests sind klinisch einfach zu bestimmen und kommen bei hoher Vorhersagegüte mit wenigen Variablen aus. Alle erstellten Scores sind praxistauglich und stellen eine Weiterentwicklung der bisher zur Verfügung stehenden Tools oder komplette Neuerungen zur Vorhersage des Outcomes nach endourologischer Steintherapie dar. Dies ist nicht nur für den Patienten von Bedeutung, sondern hilft auch den Kliniken OP- und Verweiltage besser zu planen und somit den Behandlungsertrag zu kalkulieren.
Körpersymmetrie gilt unter Evolutionswissenschaftlern als Hinweis auf eine stabile Entwicklungsgeschichte von der Eizelle bis hin zum erwachsenen Lebewesen mit daraus resultierender Gesundheit. Symmetrie steht für gute Abwehrmechanismen trotz einflussnehmender Störfaktoren, die allgegenwärtig sind. Symmetrische Körper und Gesichter werden vom anderen Geschlecht bevorzugt und als attraktiver bewertet. Das Gegenstück der Symmetrie bildet die fluktuierende Asymmetrie als Abweichung von perfekter, bilateraler Symmetrie an verschiedenen Stellen des Körpers. Symmetrie kann somit als Fitnessindikator angesehen werden, also als ein Merkmal des erfolgreichen Umwerbens in der Partnerwahl. Dies geschieht typischerweise durch die Entwicklung eines Merkmals oder durch aufwändigeres Verhalten, dessen Ausbildung für ein weniger „fittes“ Individuum zu kostspielig wäre. Die Kernfragen der vorliegenden Studie waren, ob sich diese Anforderung des Fitnessindikators Symmetrie auf die verborgene Struktur des Kehlkopfes übertragen lässt und ob die Asymmetrie des Kehlkopfes mit der Attraktivität der Stimme assoziiert ist. Die fluktuierende Asymmetrie des Larynx wurde bisher noch nicht untersucht. An der Untersuchung nahmen 80 Versuchspersonen im Alter von 20 bis 70 Jahren teil. Hauptzielgrößen waren Larynxasymmetrie und Stimmattraktivität. Die Larynxasymmetrie wurde mittels Videolaryngostroboskopie und anschließender Asymmetriebewertung auf einer 7-stufigen Skala durch Experten erfasst. Die Attraktivität der Stimme wurde auf Basis eines vorgelesenen phonetischen Standardtexts durch Dritte bewertetet. Weitere Variablen waren die Gesichtsasymmetrie, die durch Vermessung von Fotografien bestimmt wurde, und die durch Dritte bewertete Gesichtsattraktivität. Mit Hilfe eines Fragebogens, der abgesehen von Alter, Geschlecht, Anzahl bisheriger Sexualpartner, Erkältungskrankheiten im vorherigen Jahr sowie eingenommener Medikamente und das Rauchverhalten die Beschwerdenliste nach Zerssen (1976) und die Kurzfassung des Voice Handicap Index (VHI-12) enthielt, wurde versucht, die Gesundheit zu registrieren. Darüber hinaus erbat der Fragebogen bei weiblichen Probanden Angaben zum Menstruationszyklus, um die Fertilität zum Messzeitpunkt zu erfassen. Der Erfassung der Körperkonstitution dienten die Messungen von Größe und Gewicht, des Körperfettanteils und der Muskelmasse sowie die Umfangsbestimmung von Hals, Schulter, Brust, Taille, Hüfte und Bizeps. Das 2D:4D-Längenverhältnis wurde mit Hilfe einer Fotokopie der palmaren Handseite als Indikator für pränatales Testosteron ermittelt. Der zentrale Zusammenhang zwischen Stimmattraktivität und Larynxasymmetrie bestätigte sich nur für Männer. Für diese bestand außerdem eine positive Relation der Stimmattraktivität mit dem Schulter-Hüft-Verhältnis und dem Verhältnis von Brust zu Taille, d. h. Stimmen von Männern mit verhältnismäßig breiter Schulter und breiter Brust wurden attraktiver bewertet. Umgekehrt galt: Je niedriger der BMI, Körperfettanteil, Halsumfang, das Alter und die Anzahl eingenommener rezeptpflichtiger Medikamente, umso höher war die Attraktivitätsbewertung ihrer Stimme. Weibliche Stimmen wurden umso attraktiver bewertet, je jünger die Frauen waren, je größer das Brust-Taille- Verhältnis, je niedriger das Taille Hüft-Verhältnis, je geringen der Halsumfang, je niedriger der Stimmstörungsindex (VHI-12) und je weniger Zigaretten sie geraucht haben. Erwartungsgemäß korrelierte die Larynxasymmetrie bei Männern signifikant negativ mit der Gesichtsattraktivität sowie beinahe signifikant mit dem Schulter-Hüft-Verhältnis. Männliche Larynges wurden außerdem asymmetrischer bewertet, je älter die Person, je höher der BMI, der Körperfettanteil, der Halsumfang und die Anzahl eingenommener Medikamente war. Für Frauen einzig (positiv) signifikant wurde der Zusammenhang zwischen Larynxasymmetrie und Nikotinabusus. Die zusätzlich erfolgten Regressionsanalysen erzielten ein signifikantes Ergebnis für den Zusammenhang zwischen der Stimmattraktivität mit der Muskelmasse für beide Geschlechter, außerdem gelang es, einen signifikanten Zusammenhang zwischen der Larynxasymmetrie und der SHR bei Männern darzustellen. Die (negativen) Korrelationen zwischen der Larynxasymmetrie für Männer mit Stimm- und Gesichtsattraktivität deuten darauf hin, dass Larynxasymmetrie als Fitnessindikator dienen kann. Darüber hinaus lieferte die vorliegende Studie keine einfach interpretierbaren Ergebisse; häufig waren sie geschlechtsspezifisch. Die Dissertation unterstrich damit die Komplexität der Zusammenhänge und wies auf den Stellenwert von Geschlechterunterschieden hin. Weiterführende Untersuchungen sind nötig, um die Ergebnisse zu bestätigen und um den Stellenwert der Larynxasymmetrie für Frauen zu klären.
Einleitung In ihrer klinischen Symptomatik lassen sich der ischämische Schlaganfall (IS) und die intrazerebrale Blutung (ICH) nicht sicher unterscheiden. Hinsichtlich der Akuttherapie, die eine möglichst schnelle Wiederherstellung der zerebralen Sauerstoffversorgung („time is brain“) zum Ziel hat, ist diese Differenzierung jedoch essentiell. Das Ziel der vorliegenden Arbeit ist der Nachweis serologischer Biomarker in der Frühphase des Schlaganfalls zur Differenzierung zwischen IS und ICH. Hypothesen-gestützt wurden aufgrund pathophysiologischer Überlegungen hierfür die ZNS-spezifischen Proteine GFAP, UCH-L1, pNf-H, MBP und Tau untersucht. In einem hypothesenfreien Ansatz wurden Serumproben von Schlaganfallpatienten massenspektrometrisch analysiert.
Material und Methoden Die Patientenrekrutierung für die vorliegende Arbeit erfolgte im Rahmen der prospektiven, multizentrischen BE FAST II-Studie zur Evaluation von GFAP als Biomarker der akuten ICH. Von Mai 2012 bis April 2014 wurden Serumproben von Patienten mit akuter Schlaganfallsymptomatik in der Klinik für Neurologie der Goethe-Universität Frankfurt am Main gesammelt. Mittels kommerziell verfügbaren ELISA-Kits wurden die Serumkonzentrationen der Proteine UCH-L1, pNf-H, MBP und Tau bestimmt. Die Analyse der GFAP-Serumkonzentration erfolgte durch Roche Diagnostics mit Hilfe des Elecsys®-Systems, einem Elektrochemiluminiszenz-Immunoassay. Für die Massenspektrometrie wurden Serumproben aus der BE FAST-I-Studie, die von Ende des Jahres 2010 bis Anfang des Jahres 2011 asserviert wurden, eingesetzt. Die massenspektrometrischen Untersuchungen wurden in der Abteilung „Funktionelle Proteomics“ im Fachbereich Medizin der Goethe-Universität Frankfurt am Main durchgeführt.
Ergebnisse Tau und MBP ließen sich in den meisten Serumproben nicht nachweisen. In der pNf-H-Messung lag die Konzentration bei 27 von 35 Patienten oberhalb der Nachweisgrenze, wobei sich kein signifikanter Unterschied zwischen IS und ICH ergab (p = 0,69). UCH-L1 ließ sich bei 28 von 29 Patienten nachweisen. In der IS-Gruppe war eine signifikant (p = 0,005) höhere UCH-L1-Konzentration nachweisbar (Median 5,71 ng/ml) als in der ICH-Gruppe (Median 2,37 ng/ml). GFAP war bei allen 45 Patienten nachweisbar mit signifikant (p < 0,00005) höherer Konzentration in der ICH-Gruppe (Median 2,87 ng/ml) verglichen mit der IS-Gruppe (Median 0,01 ng/ml). Zudem fand sich eine positive Korrelation der UCH-L1-Werte in der IS-Gruppe mit dem Patientenalter (r = 0,62, p = 0,01), sowie eine positive Korrelation der GFAP-Werte in der ICH-Gruppe mit dem Patientenalter (r = 0,54, p = 0,03), dem NIHSS-Wert (r = 0,69, p = 0,04) und mit dem ICB-Volumen (r = 0,60, p = 0,01). In der massenspektrometrischen Analyse ließ sich eine Top Liste aus 22 Proteinen erstellen, die jeweils signifikante Unterschiede zwischen IS und ICH aufweisen.
Diskussion Die Rolle des Ubiquitin-Proteasom-System (UPS) und insbesondere von UCH-L1 beim IS ist bislang noch nicht abschließend geklärt. Nach einer zerebralen Ischämie ist jedoch eine Upregulation von UCH-L1 beschrieben, u.a. durch eine verstärkte UPS-Aktivität durch Aggregate fehlgefalteter Proteine. Daneben reagieren Neurone sensibler auf eine Hypoxie als Gliazellen mit einer dominierenden Freisetzung neuronaler Proteine wie UCH-L1. Bei ICH kommt es dagegen eher zu einer unspezifischen Destruktion des Hirngewebes mit vorwiegender glialer Schädigung und rascher Freisetzung glialer Proteine wie GFAP. Mit UCH-L1 und GFAP konnten zwei Proteine als erfolgsversprechende Kandidaten zur Differenzierung zwischen IS und ICH in der Frühphase identifiziert werden. Zur weiteren Validierung sind Untersuchungen an einer großen Population notwendig, die auch kleinere Infarkte und Hirnblutungen einschließt. Auch der Einfluss epidemiologischer und klinischer Faktoren wie z.B. dem Patientenalter muss weiter evaluiert werden.
Die mittels Massenspektrometrie erstellte Top Liste aus 22 Proteinen enthält vielversprechende Biomarker-Kandidaten, die signifikante Unterschiede zwischen IS und ICH aufweisen und ebenso an einem großen Patientenkollektiv weiter untersucht werden müssen.
Limb stump pain after amputation, due to sensitized neuromas, is a common condition that can cause a great deal of suffering in affected patients. Treatment is difficult, requiring a multidisciplinary approach that is often unsatisfactory. One treatment used to mitigate pain is electrical stimulation (EStim), administered using several different therapeutic approaches. The research described in this dissertation sought to characterize changes in peripheral nerve morphology, and neuroma formation, following limb amputation, with an eye toward developing better treatment strategies, that intervene before neuromas are fully formed. Another focus of this study was to evaluate the effect EStim has on changes in peripheral nerve morphology, and neuroma formation, following limb amputation.
Right forelimbs of 42 male Sprague Dawley rats were amputated. At 3, 7, 28, 60 and 90 days post amputation (DPA) 6 limb stumps, in each group, were harvested and changes in peripheral nerve morphology, and neuroma formation were measured. In addition, limb stumps of 6 EStim treated, 6 sham-treated (deactivated EStim devices), and 6 non-treated rats were harvested at 28 DPA.
Analysis revealed six distinct morphological characteristics of peripheral nerves during nerve regrowth and neuroma development; 1) normal nerve, 2) degenerating axons, 3) axonal sprouts, 4) unorganized bundles of axons in connective tissue, 5) unorganized axon growth into muscles, and 6) unorganized axon growth into fibrotic tissue (neuroma). At the early stages (3 & 7 DPA), normal nerves could be identified throughout the limb stump tissues and small areas of axonal sprouts were present near the distal tip of the stumps. Signs of degenerating axons were evident from 7 to 90 DPA. From day 28 on, variability of nerve characteristics, with signs of unorganized axon growth into muscle and fibrotic tissue, and neuroma formation, became visible in multiple areas of stump tissue. These pathological features became more evident at 60 and 90 DPA. EStim treated stumps revealed neuroma formation in 1 out of 6 animals, whereas in sham and controls, neuroma formation was seen in 4 out of 6 stumps respectively.
We were able to identify 6 separate histological stages of peripheral nerve regrowth and neuroma formation over 90 days following amputation. Axonal regrowth was observed as early as 3 DPA, and signs of unorganized axonal growth and neuroma formation were evident by 28 DPA. Our observations suggest that EStim-based treatment and/or other prevention strategies might be more effective if administered in the initial dynamic stages of neuroma development.
Das Projekt „Geo-Social Analysis of Physicians' Settlement" (kurz GAP) wurde ins Leben gerufen, um potentielle Lücken in der ambulanten medizinischen Versorgung deutscher Großstädte aufzudecken, insbesondere in Bezug auf den sozioökonomischen Status der in einem Praxisumfeld lebenden Bewohner. In der vorliegenden Studie erfolgte die Untersuchung des Niederlassungsverhaltens von Ärzten und Psychotherapeuten in Berlin-West im Hinblick auf sozioökonomische, demographische und topographische Faktoren.
Das Untersuchungsgebiet Berlin-West wurde in 251 Praxisumfelder untergliedert. Für diese wurden Daten zu Einwohnerzahl, Altersstruktur und Wohnlage sowie Arbeitslosen- und Ausländerquoten zusammengetragen. In vergleichenden Analysen konnten dann die Unterschiede im Niederlassungsverhalten der 20 Fachgebietskategorien hinsichtlich des sozialen Status der Praxisumfelder herausgearbeitet werden. Weitere Auswertungen beinhalteten eine genderspezifische Praxisumfeld-Analyse sowie Analysen nach Praxisform, Fremdsprachenkenntnissen der Ärzte und Psychotherapeuten sowie des Praxis-Jahres-Überschusses als Maß für das ärztliche Einkommen.
Im Rahmen einer Fachgebiet-Sozialindikatoren-Analyse ergab sich weder für die hausärztliche noch für den Großteil der fachärztlichen Versorgung in Berlin-West eine signifikante Bevorzugung von Gebieten mit einem höheren sozialen Status. Lediglich für die Gruppe der Ärztlichen und Psychologischen Psychotherapeuten zeigte sich, dass diese eindeutig vermehrt in Gegenden mit hohem sozialen Status niedergelassen sind. In der Gender-Analyse konnte gezeigt werden, dass Ärztinnen und Psychotherapeutinnen sozial schwächere Gegenden seltener als Niederlassungsstandort wählen. Im Rahmen einer Störfaktoren-Analyse konnten Zentrumsdistanz und Einwohnerdichte als mögliche Einflussfaktoren auf die Standortwahl der Ärzte und Psychotherapeuten ausgeschlossen werden.
Insgesamt zeigen die Ergebnisse, dass über eine Unterteilung der einzelnen Großstädte in mehrere Planungsbereiche – statt sie wie bisher als einen einzelnen großen zu betrachten – nachgedacht werden sollte. Um die medizinischen Bedürfnisse der sozial schlechter gestellten Bevölkerung besser abdecken zu können, wäre die Einführung eines Sozialfaktors, ähnlich dem des bereits existierenden Demographiefaktors (zur Anpassung an die Altersstruktur der Bevölkerung) für die Berechnung des tatsächlichen Ärztebedarfs empfehlenswert. Auf diese Art und Weise könnte zukünftig eine bedarfsgerechtere Planung der Ärzteverteilung erfolgen und somit ein gleichmäßigerer Zugang zu ambulanter vertragsärztlicher Versorgung für alle GKV-Versicherten gewährleistet werden.
Suspected Blood Indicator (SBI) ist ein Modus in der RAPID® Reader 6 Software des Kapselendoskopie (KE) Systems, PillCam® SB2 (Given Imaging Ltd., seit 2015 Medtronic GmbH), welcher den Behandler bei der Auffindung potenzieller Dünndarmblutungen unterstützt. Ziel dieser Arbeit ist es, die Sensitivität sowie die Spezifität des SBI-Modus der zweiten Kapselgeneration (PillCam® SB2) zu evaluieren.
Es handelt sich um eine retrospektive Studie, bei der KE-Aufnahmen von insgesamt 199 Patienten, die sich in der Zeit von Juni 2008 bis März 2013 in der Universitätsklinik Frankfurt einer KE-Untersuchung unterzogen hatten, beurteilt wurden. Die Aufnahmen wurden von erfahrenen Behandlern konventionell durchgesehen und auf blutende sowie potenziell blutende Läsionen untersucht. Gleichzeitig wurden die SBI-Markierungen in diesen Aufnahmen von einem unabhängigen Mitarbeiter gezählt und die Ergebnisse den Befunden und Diagnosen der erfahrenen Behandler gegenüberge-stellt.
Das Patientenkollektiv bestand aus 64 weiblichen und 135 männlichen Patienten (mitt-leres Alter 59 Jahre, Spannweite 12–91 Jahre). Die häufigsten Indikationen zur KE-Untersuchung waren in 97/199 Fällen eine mittlere gastrointestinale Blutung und in 50/199 Fällen eine Eisenmangelanämie. In 157/199 Fällen hatten die erfahrenen Be-handler keine Blutung feststellen können. In 137/199 Aufnahmen setzte SBI jedoch mindestens eine Markierung (durchschnittlich 18,4 Markierungen pro Aufnahme) und in 20/199 Aufnahmen gab es keine Markierung. In 13/199 Untersuchungen stellten die Behandler wenig Blut fest, SBI fand hier ebenfalls Blut und setzte durchschnittlich 36,1 Markierungen. In 29 Aufnahmen wurde von dem Behandler viel Blut festgestellt, mit durchschnittlich 46,7 Markierungen pro Aufnahme. SBI setzte Markierungen in insge-samt 179 Aufnahmen, nur in 42 davon hatten auch die erfahrenen Behandler Blutun-gen festgestellt. Alle aktiven Blutungen wurden von SBI erkannt mit einer Sensitivität von 100 % und einer Spezifität von 13 %. Bei der ROC-Analyse wurde der optimale Grenzwert für die Bestimmung einer aktiven Blutung bei 51 SBI-Markierungen (viel Blut) und bei 31 SBI-Markierungen für kleinere Läsionen (wenig Blut) festgesetzt.
Zusammenfassend kann man sagen, dass der SBI-Modus eine hervorragende Hilfe zum Ausschluss einer aktiven Blutung ist. Die hohe Sensitivität Blutungen zu erkennen, kann im Klinikalltag von weniger geübten Mitarbeitern dazu genutzt werden, Patienten oh-ne aktive Blutung schneller zu erkennen und dadurch früher entlassen zu können. Für das Auffinden aktiver Blutungsquellen oder anderer Läsionen sowie für eine genaue Diagnosestellung ist jedoch eine Inspektion der Aufnahme durch einen erfahrenen Behandler weiterhin unabdingbar.
Langzeitbeobachtung der Therapie von Hämophilie A-Patienten mit einem humanen Faktor VIII-Konzentrat
(2019)
This doctoral thesis entitled “Long-term surveillance of the therapy of haemophilia A patients with a human plasma-derived factor VIII concentrate” was performed to assess the influence of the chronic long-term therapy with a human plasma-derived factor VIII concentrate in daily clinical practice on the health of haemophilia A patients.
Haemophilia A is a chronic disease, caused by a congenital deficiency of coagulation factor VIII, which requires life-long haemostatic treatment. The severity of bleedings, as the main clinical feature of haemophilia A, is generally correlated with the residual activity of coagulation factor VIII.
Until recently, factor VIII preparations, used to replace the deficient factor VIII, were the only treatment option for haemophilia A. Development of inhibitory antibodies against factor VIII is the most serious complication associated with the use of factor VIII products, rendering the administered factor VIII ineffective.
To date, all novel treatments still rely on some factor VIII replacement therapy. At least in the near future and probably for longer, (concomitant) therapy with factor VIII concentrates will continue to be necessary for treatment of haemophilia A, emphasising the continuous need for efficacy and safety data in terms of pharmacovigilance on factor VIII replacement therapy.
Medicines to treat haemophilia A, are authorised for use, when evidence of its efficacy and safety is limited to data of a small number of investigated patients during short-term observation periods of about six months, and thus have not been systematically assessed in all patient groups until marketing authorisation. Long-term efficacy and safety data from post-marketing surveillance are important to prove that a chronic treatment is efficacious and safe in the real-life setting by monitoring “real-life” patients of all age groups, rather than a carefully selected patient population. Medical and scientific analyses of such long-term data are crucial to detect, understand, and potentially prevent the harm resulting from (new) adverse drug reactions, including those, which only rarely occur and therefore are difficult to detect.
Therefore, data from two prospective surveillance studies investigating real-life therapies with the same human plasma derived factor VIII concentrate were combined and analysed retrospectively. It was hypothesised that the chronic long term therapy with a human plasma-derived factor VIII concentrate in daily clinical practice is effective, safe, and well tolerated with no unexpected adverse effect on the health of haemophilia A patients. It was the aim of this analysis to investigate the influence of the chronic long-term treatment with the factor VIII concentrate on the health of patients with severe as well as nonsevere haemophilia A including all age groups in a real-life setting. In addition, the influence of prophylactic factor VIII treatment or the switch to this regimen on the annual bleeding rate of all haemophilia A patients, and the long-term effects of this regimen on the patients’ annual bleeding rates were investigated.
Starting in 1998 until 2015, data of 1418 patient-years from 198 haemophilia A patients representing all age groups and haemophilia A severities were analysed. This study covered 18 years of documentation time with a mean observation period of more than seven years per patient. It is the longest study of a single factor VIII concentrate conducted so far, investigating the therapy of haemophilia A. The only observed side effects involved low incident factor VIII inhibitor formation in patients at risk (13 % of previously untreated patients, compared with usually about 30 %). Factor VIII inhibitor development was mainly transient, with low titers, and without clinical relevance. Any, even low frequent prophylaxis was found to be significantly better than on demand and had the greatest effect on the annual bleeding rate of patients, irrespective of their age or haemophilia A severity. Patients suffered during continuous prophylaxis from a very low bleeding rate (median 1.3 compared with 31.4 under on demand), down to no bleeding per year. Patients whose regimen changed to continuous prophylaxis benefitted most (median annual bleeding rate 1.1), irrespective of age or haemophilia A severity.
This analysis demonstrates that the chronic long-term therapy with the plasma-derived factor VIII concentrate in daily clinical practice is effective, safe, and well tolerated. Thus, data on efficacy and safety obtained during chronic long-term therapy with the human plasma-derived factor VIII concentrate reaffirm that there is no unexpected adverse effect on the health of haemophilia A patients.
These results support the therapeutic concept of a life-long prophylaxis of haemophilia A patients with a human plasma-derived factor VIII concentrate.
Eine positive Einstellung von Medizinstudierenden gegenüber Impfungen ist wichtig, um hohe Impfquoten unter Mitarbeitern des Gesundheitswesens zu erreichen. Das Wissen von Medizinstudierenden zum Thema Impfen zeigte sich in vorangegangen Befragungen lückenhaft, dabei ist ausreichendes Wissen der zukünftigen Ärzte nötig, um gerade impfskeptischen Patienten zu begegnen. In den Vorlesungen der klinischen Semester werden vor allem theoretische Informationen zu Impfungen vermittelt. Im späteren Arbeitsalltag müssen Ärzte jedoch anhand eines mehr oder weniger gut geführten Impfpasses erforderliche Impfungen identifizieren. Ziel dieser Dissertation war es, zu untersuchen, inwieweit ein Impfkurs an der Goethe-Universität Frankfurt am Main zur Verbesserung von Einstellungen, Wissen und praktischen Fertigkeiten der Studierenden im Umgang mit dem Impfpass beitragen kann.
Zu diesem Zwecke wurde ein Impfseminar entwickelt und als Pflichtkurs in die Zentrale Unterrichtswoche des Blockpraktikums Innere Medizin (zweites bzw. drittes klinisches Semester) integriert. Studierende wurden entweder in einem praktischen Kurs mit Übungen an beispielhaften Impfpässen oder in einem theoretischen Kurs mit einem Vortrag unterrichtet. Vor und nach dem Kurs sollte ein Pretest- bzw. Posttest-Fragebogen ausgefüllt werden. Der Pretest enthielt vier Fragen zur Einstellung gegenüber Impfungen (Antworten auf einer fünf- oder siebenstufigen Skala vom Likert-Typ), eine Wissensfrage (Antwort auf einer fünfstufigen Skala vom Likert-Typ) sowie vier Fragen zur Selbsteinschätzung impfpraktischer Fertigkeiten (Schulnoten). Der Posttest wiederholte die Fragen zu Einstellung und Wissen und enthielt zusätzlich eine Frage zum korrekten Vorgehen nach einer Nadelstichverletzung sowie Fragen zum Umgang mit dem Impfpass. Diese mussten mit einem beispielhaften Impfpass bearbeitet werden. Abschließend fand eine freiwillige Evaluation des Kurses statt. Die statistische Analyse erfolgte mittels Microsoft Office Excel 2007 und BiAS. für Windows.
Im Wintersemester 2017/2018 absolvierten insgesamt 149 Studierende den Impfkurs (65,8 % im praktischen Kurs), von denen 99,3 % auch an der Studie teilnahmen. Der praktische Kurs wurde in der Online-Evaluation besser bewertet als der theoretische Kurs (Note 1,9 vs. 2,9; p=0,02). Teilnehmer am praktischen Kurs bewerteten die Kursinhalte als relevanter für den späteren Arbeitsalltag (p<0.01).
66,2 % (n=98) der Studienteilnehmer waren weiblich, 44,2 % (n=65) hatten in der vorangegangen Saison eine Impfung gegen Influenza erhalten. Gegen Influenza geimpfte Studierende nannten vor allem Selbstschutz und den Schutz von Patienten als Gründe für ihre Impfung (75,4 % bzw. 73,8 %). Die häufigste Antwort nicht geimpfter Studierender war ein Mangel an Gelegenheit (68,3 %). Die Studierenden wiesen generell eine positive Einstellung gegenüber Impfungen auf. Bei Studierenden, die schon vor dem Kurs eine hohe Zustimmung zum Thema Impfen aufwiesen, konnte der Zustimmungs-Score durch den Kurs signifikant gesteigert werden (p=0,01). Bei Studierenden mit mittlerer Zustimmung oder skeptischer Haltung gegenüber Impfungen zeigte der Kurs keinen Einfluss auf den Grad der Zustimmung. Influenza-geimpfte Studierende wiesen sowohl zu Beginn als auch nach Ende des Kurses einen statistisch signifikant höheren Zustimmungs-Score als nicht Influenza-geimpfte Studierende auf (p=0,03 bzw. p=0,02). Das Wissen der Studierenden zu Impfthemen konnte durch den Kurs signifikant gesteigert werden; unabhängig von Kursformat, Alter, Geschlecht oder Influenza-Impfstatus.
Die Selbsteinschätzung, fehlende Impfungen anhand eines Impfpasses zu identifizieren, fiel signifikant (p<0,001) schlechter aus als die Einschätzung für andere Fähigkeiten. Zwischen den beiden Kursgruppen konnte, gemessen am Impfpass-Score, kein signifikanter Unterschied im Umgang mit dem Impfpass festgestellt werden. Jedoch irrten sich die Teilnehmer des praktischen Kurses häufiger bei der Identifikation abgeschlossener Grundimmunisierungen (p=0,04), vor allem bei der Meningokokken-Impfung. Zusätzlich erkannten Teilnehmer des theoretischen Kurses häufiger die Notwendigkeit einer Varizellen-Impfung (p=0,02).
Das leicht bessere Abschneiden der Teilnehmer des theoretischen Kurses erklärt sich am ehesten durch die Wiederholung der Impfempfehlungen, die deshalb in den praktischen Kurs, der aufgrund der interaktiven Lehrmethode besser bewertet wurde, integriert werden sollte.
Der Kurs konnte die Einstellung impfskeptischer Studierender nicht verändern. Ungeklärt ist, worin diese Einstellungen begründet sind und wann sie entstehen. Es zeigte sich eine Diskrepanz zwischen der positiven Einstellung zu Impfungen und der Influenza-Impfquote. Es bleibt abzuwarten, ob die Implementierung des Impfkurses zu einer Steigerung der Influenza-Impfquoten beiträgt. Gegenstand weiterer Untersuchungen sollte sein, welche Maßnahmen zielführend sind, um die generell positive Einstellung und hohe Impfabsicht in einer hohen Impfquote abzubilden.
Infektionen mit HBV, HCV und HIV verlaufen potentiell chronisch und besonders bei HIV auch tödlich. Komplexe, zum Teil lebenslange Therapien stellen eine große Belastung für die betroffenen Patient*innen und das Gesundheitssystem dar. Die Sicherheit von Blutprodukten hat sich durch Testung auf HBV, HCV und HIV in den vergangenen Jahrzehnten weltweit stark verbessert. Ein kontinuierliches Risikoassessment ist notwendig um diesen Trend aufrecht zu erhalten und auf Änderungen von Einflussfaktoren rechtzeitig reagieren zu können. Die Zusammenschau der Spendenscreeningdaten des DRK Baden-Württemberg Hessen, Nord-Ost, West und des Bayrischen Roten Kreuzes aus den Jahren 2008 bis 2015 ergab, dass in allen Blutbanken unterschiedliche Testsystem verwendet wurden. In zurückliegenden Analysen kamen zudem verschiedene mathematische Modelle zur Anwendung um die TTVI-Risiken in Deutschland abschätzen zu können. Ein direkter Vergleich der Blutspendedienste untereinander sowie eine Analyse der Risikoentwicklung über die Zeit sind somit erschwert. Eine Vereinheitlichung der verwendeten Testsysteme sowie der angewandten Modelle ist anzustreben. Die Anwendungen der Risikomodelle von Busch et al., Hourfar et al. und Weusten et al. ergaben für alle untersuchten Blutbanken Ergebnisse, die geringfügig höher als die beobachteten Risikowerte ausfielen. Das von Weusten et al. entwickelte Modell erwies sich als am besten geeignet zur Risikostratifizierung, da unterschiedliche Eigenschaften der Viren am genauesten berücksichtigt und TTVI-Risiken im Vergleich mit den anderen Modellen sowie zu den beobachteten Fallzahlen konservativ eingeschätzt werden. Nach diesem Modell lagen die Risiken für eine Transmission pro eine Million transfundierter Einheiten in den Jahren 2008 bis 2015 für HBV bei 1, für HCV bei 0,3 und für HIV bei 0,1. Der Vergleich der Zeiträume 1997 bis 2005 und 2008 bis 2015 mittels des Modells von Hourfar et al. ergab aktuell höhere Risiken für TTVIs mit HCV und HIV, wohingegen die Risiken von TTVIs mit HBV gesunken sind. Diese Entwicklungen sind auf erhöhte HCV- und HIV-NAT Only Inzidenzen sowie auf den wachsenden Anteil HBV-geimpfter Spender*innen zurückzuführen. Modellierungen anhand der Spenderscreeningdaten des DRK Baden-Württemberg Hessen mittels des Modells von Weusten et al. zeigten, dass der Faktor Plasmavolumen nicht zur Risikooptimierung geeignet ist. Ein erhöhter Forschungsbedarf im Bereich minimal infektiöse Dosen konnte betont werden, da sich der Einfluss der N50 auf die Risiken als sehr hoch herausstellte und eine Übersicht aktueller Arbeiten teils stark differierende Werte ergab. Die Verkleinerung der Poolgrößen erwies sich als potente Option zur Risikoreduktion, bedarf jedoch weiter Kosten-Nutzen-Analysen bei aktuell bereits sehr geringen TTVI-Risiken. Eine Vergrößerung der Spendeintervalle konnte als ebenso wirkungsvolle Möglichkeit zur Verringerung der Transmissionsrisiken ermittelt und eingeordnet werden. In diesem Zusammenhang wurde überdies gezeigt, dass TTVI-Risiken von Aphereseprodukten um ein Vielfaches höher liegen als die Risiken von Vollblutspenden.
Acute and chronic inflammation play a pivotal role in various diseases, such as rheumatoid arthritis, atherosclerosis, bacterial as well as viral infections and therefore are an everyday-challenge in clinical practice. In this context, biologically active products of the cyclooxygenases and the prostanoid synthases, e.g. prostaglandins, critically contribute to various aspects of the inflammatory response in almost every tissue of the body. Emerging evidence over the past decades has demonstrated that these mediators are not only responsible for a pro-inflammatory response, but also show anti-inflammatory and pro-resolving properties. The relevance of biologically active lipids in this context is strengthened by the clinical efficacy of nonsteroidal anti-inflammatory drugs (NSAIDs), e.g. Aspirin®, which block the biosynthesis of the mediators via the cyclooxygenase (COX) enzymes. Notably, microsomal prostaglandin E synthase-1 (mPGES-1)-derived prostaglandin E2 (PGE2) is a well-studied, functionally versatile PG, which promotes its effects via specific G protein-coupled receptors (GPCRs). Activation of these receptors elicits an internal signal transduction cascade, including activation of the adenylyl cyclase (AC). Active AC contributes to an elevated intracellular cyclic adenosine monophosphate (cAMP) level, which in turn activates the transcription factor cAMP response element-binding protein (CREB) via phosphorylation.
While the role of PGE2 in the inflammatory context has been well-documented in previous literature, relatively little is known about CREB-dependent transcriptional changes in inflammation. Therefore, the aim of this study was to investigate the effect of mPGES-1-derived PGE2 on CREB-mediated transcriptional changes specifically in murine wild-type (WT) and mPGES-1 knock-out (KO) macrophages in an inflammatory context. To address this issue, bone marrow-derived macrophages (BMDMs) were treated with either the bacterial cell wall component lipopolysaccharide (LPS) in combination with interferon-γ (IFN-γ) or the yeast extract zymosan. To analyze effects on CREB activation we determined protein expression profiles of relevant PGE2-synthesizing enzymes, i.e. COX-2 and mPGES-1, as well as activity of the downstream transcription factor CREB. The activity of mPGES-1 was simultaneously determined by the analysis of the prostanoid kinetics. Under these experimental conditions we showed that COX-2 is strongly induced, and we also observed elevated activated CREB levels in WT as well as in mPGES-1 KO macrophages. Further, both LPS+IFN-γ and zymosan increased expression of mPGES-1 in WT but not in mPGES-1-deficient macrophages. These findings go in hand with largely similar alterations in the PGD2, TXB2, PGF2α profiles in WT and mPGES-1 KO macrophages upon stimulation. Of note, an elevated PGE2 production was also observed in mPGES-1-deficient macrophages at later stages upon inflammatory conditions. Subsequently, potential CREB-regulated targets were identified in macrophages upon inflammatory stimuli after 16 h by chromatin immunoprecipitation (ChIP) followed by Next-Generation-Sequencing (NGS). Surprisingly, despite equal levels of pCREB the characterization of CREB binding sites revealed different targetome profiles between WT and mPGES-1 KO macrophages. Specifically, the fatty acid metabolic processes-associated targets appeared to be selectively lost in mPGES-1-deficient vs. WT macrophages. We further validated one of those targets, i.e. the endoplasmic reticulum lipid raft-associated protein 1 (Erlin1), at the mRNA expression level, which indeed was differentially transcribed in response to different PGE2 synthesizing conditions.
Mechanistically, CREB is a well-characterized phosphorylation-dependent transcription factor in cell survival, proliferation, differentiation, and immune responses. Yet, our understanding of the functions of CREB in inflammation, specifically with respect to its activation by PGE2, is insufficient. Due to its biological relevance in inflammation it clearly requires additional studies to shed light on the details of CREB activation in macrophages to provide possibilities of therapeutic interventions.
Das Ziel dieser Studie war der retrospektive Vergleich zweier fortschrittlicher robotergestützter Angiographie-Systeme in Bezug auf Strahlendosis und Bildqualität bei der Bildgebung im Rahmen der konventionellen transarteriellen Chemoembolisation (cTACE) von bösartigen Lebertumoren.
Dafür haben wir 106 Patienten (insgesamt 57 Frauen und 49 Männer; Durchschnittsalter 60 ± 11 Jahre), welche eine cTACE Therapie an einem der zwei Generationen von Roboter-Angiographieplattformen erhalten hatten, einbezogen. Die Patienten wurden in zwei Gruppen eingeteilt (n=53): Gruppe 1 (Behandlung am Gerät der ersten Generation) und Gruppe 2 (Behandlung am Gerät der zweiten Generation). Die Strahlendosis für die Fluoroskopie und die digitale Subtraktions-Angiographie (DSA) wurde zwischen den Angiographiegeräten der ersten bzw. zweiten Generation verglichen. Zu den besonderen Merkmalen des Systems der zweiten Generation- im Vergleich zum System der ersten Generation - gehörten ein verfeinertes kristallines Detektorsystem, zur verbesserten Rauschunterdrückung und eine fortschrittliche CARE-Filtersoftware, zur Senkung der Strahlendosis. Die Strahlendosis wurde mit einer herkömmlichen im Gerät verbauten Ionisationskammer gemessen. Die Bildqualität wurde von drei unabhängigen Radiologen anhand einer 5-Punkt-Likert-Skala bewertet. Beide Gruppen waren in Bezug auf Anzahl und Lage der Läsionen sowie Körpergewicht, BMI-Werte und anatomische Varianten der versorgenden Leberarterien vergleichbar (alle p > 0,05).
Das Dosisflächenprodukt (DAP) für die Fluoroskopie war in Gruppe 2 signifikant niedriger (1,4 ± 1,1 Gy·cm2) als in Gruppe 1 (2,8 ± 3,4 Gy·cm2; p = 0,001). Für DSA war DAP in Gruppe 2 (2,2 ± 1,2 Gy·cm2) signifikant niedriger (p = 0,003) gegenüber Gruppe 1 (4,7 ± 2,3 Gy·cm2). Die Ergebnisse für die DSA-Bildqualität (IQ) zeigten signifikante Verbesserungen für Gruppe 2 um 30% im Vergleich zu Gruppe 1 (p = 0,004). In der Fluoroskopie waren die Werte für den IQ in Gruppe 2 76% höher als in Gruppe 1 (p = 0,001). Eine gutes bis sehr gutes Inter-rater-agreement mit Kappa- Fleiss-Koeffizienten von κ = 0,75 für Gruppe 1 und κ = 0,74 für Gruppe 2 wurde erreicht.
Zusammenfassend ließ sich feststellen, dass die neueste Generation der robotergestützten Angiographiegeräte im Zusammenhang von cTACE der Leber eine erhebliche Reduzierung der Strahlendosis bei gleichzeitiger Verbesserung der Bildqualität in der Fluoroskopie und DSA-Bildführung ermöglicht.
The carpal tunnel syndrome (CTS) is a chronic compression of the median nerve in the carpal tunnel, a condition in which the nerve is constricted especially under the flexor retinaculum (FR). The disease predominantly appears between 40 and 83 years of age. Women are significantly more often affected than men. The same applies to overweight people in comparison to normal weight people. Abnormal sensations at night, including paresthesias and dysesthesias, are classical CTS symptoms, predominately involving the middle fingers, later also the thumb. Diagnosis of CTS usually proceeds by motor nerve conduction study (mNCS) and determination of the distal motoric latency (DML). In conformity with electrophysiology, peripheral nerve ultrasonography has also attained an important diagnostic informative value. In principle, there is an open surgical procedure and an endoscopic carpal roof cleavage. The goal of therapy is the complete open division of the flexor retinaculum (FR) in order to relieve the median nerve from compression.
This work examines the morphological alterations of the median nerve at the site of the carpal tunnel after surgical decompression by means of high-resolution neurosonography in the scope of a prospective study. More than 100 patients were examined between October and December 2014 for planned decompressions surgery due to CTS. A total of 81 patients were prospectively included, 5 of which could not take part in the follow-up after six months and were excluded from this evaluation. A medical CTS case history, clinical examination findings, as well as a neurographic result were included. Patients with a relapse operation were not considered in this regard. Apart from a clinical examination and questioning of the patient three and six months after surgery, an electrophysiological examination and a high-resolution sonography of the median nerve were also carried out. Electroneurography and nerve sonography of the median nerve were applied to both hands. A prolonged distal motor latency of the median nerve amounting to 4ms, as well as a slowed nerve conduction velocity below the benchmark value of approx. 45m/s, were classified as pathological findings. In sonography, the largest cross-section area (CSA) of the median nerve was measured by applying transversal slicing to the distal transverse creases of the skin on the palmar surface of the wrist (rasceta) as well as 5cm proximal to the rasceta. The highest CSA values were determined visually. In cases of doubt several transversal slices were made until the highest CSA value could be identified.
The average age at which the disease was contracted amounted to 56.9 years. With one exception, all patients complained of nocturnal brachialgia before surgery (74, 96.2%). As far as neurological symptoms were concerned, 72 patients had paresthesias (93.6%) and 29 patients (37.7%) felt permanent numbness. A thenar atrophy of higher degree was diagnosed in two patients (2.6%). These complaints had improved in the patients surveyed in the scope of postoperative evaluations after three and six months.
Patients with motor deficits had a statistically significantly longer preoperative distal motor latency (10.5 ± 2.8ms vs. 6.5 ± 2.3ms). We observed an improvement of distal motor latency in 98% of the patients three months and six months after surgical decompression, displaying a statistically significant DML decrease from 6.6 ± 2.4ms to 4.8 ± 1.0ms and from 6.6 ± 2.4ms to 4.4 ± 1.0ms, respectively. There was a statistically significant correlation between the decrease of the nerve cross-section area and the decrease of distal motor latency.
At the time of the follow-up examination, three months after surgery, we were able to document a decrease in the CSA value in 80% of the patients. The mean CSA value decreased from 14.7 ± 4.4mm² to 12.4 ± 3.4 mm². Six months after surgical decompression the mean CSA value decreased from 14.3 ± 4.4mm² to 9.6 ± 2.3mm². Patients with a preoperative CSA value of ≥ 12mm² displayed a significantly greater relative reduction of their postoperative CSA value. Concerning all preoperative and postoperative parameters in patients who had undergone either open or endoscopic surgery, none revealed significant differences. Neither could an exploratory analysis (i.e. age, diabetic diseases) reveal any significant correlation between the parameters. Prior to surgery, a flattening of the median nerve or a loss of its fascicular structure (texture) had also been seen to exist in patients, apart from the nerve's larger cross-section area. Nerve sonography is an inexpensive and fast method. It is also extraordinarily reliable in the assessment of the CTS diagnosis and suits the necessary demands. We achieved a good efficiency with our sonographic examinations in the study presented here. New and improved developments show that high-resolution sonography will gain more and more significance in future CTS diagnostics.
The genetic mutation of the coagulation factor VIII (fVIII) results in a defective or missing protein, leading to a malfunctioning blood coagulation. The resulting disease is called hemophilia A. Depending on the severity of the mutation, affected patients experience an increased risk of pathologic bleeding after minor trauma or even sudden bleeding events. Substitution therapies with extrinsic fVIII exist using plasmatic or recombinant fVIII products. Due to an insufficient immune tolerance towards substituted fVIII, about 30 % of patients develop allogenic neutralizing antibodies (inhibitors) against substituted fVIII products. The gold standard of treating inhibitors is the immune tolerance induction (ITI), where patients are given frequent, high doses of fVIII to induce an immune tolerance. ITI therapy fails in about 30 % of patients. Mechanisms of action of ITI are part of research, as insufficient knowledge about mechanisms and prognostic factors complicate treatment. For example, the development of anti-idiotypic antibodies, which occur naturally as a regulatory mechanism of the immune system, are being studied. Such anti-idiotypes have been detected in immunoglobuline preparations and in patients after successful ITI.
Inhibitors interfere with fVIII function in coagulation by binding functional epitopes within fVIII domains. Inhibitors against the A2 and C2 domain are predominantly found, however also the C1 domain has been shown to be highly immunogenic in some patients. The polyclonality of inhibitors aggravates the understanding and treatment of these. The present project therefore focusses on the selection of synthetic anti-idiotypic antibodies to target inhibitors in patients. The phage display method was applied to, for one, isolate anti-idiotypic single chain variable fragments (scFvs) specific against human polyclonal anti-fVIII antibodies and second against two C1 domain-specific inhibitory monoclonal antibodies (mAbs).
In the first project, anti-fVIII antibodies were purified from human plasma to serve as target molecules. A previous project showed that using full plasma as a target did not yield anti-idiotypic antibodies from phage display. For the purification, protein A chromatography and fVIII coupled Affi Gel® chromatography were applied. The isolated antibodies were next used as targets for the selection of anti-idiotypic scFvs. Analysis revealed that none of the selected phages solely bound the anti-fVIII antibody target. Consequently, the test protocol was modified, which resulted in a reduction of unspecific binders. Yet, no target-specific binders were isolated from phage pools. Reason for this may have been the high diversity of the polyclonal antibody target and the limited diversity of the phage libraries.
The aim of the second project, was the selection and characterization of scFvs, that target the paratopes of C1 domain-specific mAbs GMA8011 and LE2E9. From a therapeutic viewpoint, the preparation of an anti-idiotypic antibody pool, tailored to each patient’s inhibitor population, could help neutralize inhibitors in patients. Ultimately, one GMA8011-specific scFv-carrying phage clone (H2C1) and two specifics to LE2E9 (H3G7, H3F10) were isolated. In further experiments, only the GMA8011-specific scFv showed competitive behavior in presence of fVIII, pointing towards an anti-idiotypic binding to the inhibitor paratope. The LE2E9-specific scFvs did not prevent binding of the inhibitor to fVIII. Hence, no anti-idiotypic behavior could be determined. For further characterization, selected scFvs were genetically fused to Fc antibody fragments and recombinantly produced. In this antibody format, all three scFvs showed concentration dependent binding to the target and the isotype control. The binding specificity to the target, observed in phage context, could not be reproduced. Competition experiments with fVIII confirmed that none of the scFvs bound the paratope of their target inhibitor.
The selection of anti-idiotypic scFvs from phage display libraries proves to be effortful. Polyclonal anti-fVIII antibodies purified from hemophilic plasma appear to be unsuitable as a target for phage display, likely due to the high diversity of the target molecules. Furthermore, the preparation of an individualized anti-idiotypic pools for patients by selecting scFvs against single inhibitory mAbs proves to be difficult. The selection of scFvs against anti-C1 inhibitors GMA8011 and LE2E9 produced three promising scFv-carrying phages. However, analysis could not detect anti-idiotypic behavior. Further research with inhibitors, monoclonal and polyclonal, and anti-idiotypic antibodies should be performed to bring better insight into the highly complex paratope-epitope interaction.
Die Sepsis ist mit einer hohen Letalität im Krankenhaus verbunden. Ein wesentlicher Auslöser der Sepsis ist das Endotoxin. Es führt zu Entzündungsreaktionen im Organismus mit Ausbildung eines septischen Schocks bis hin zum Multiorganversagen. Zudem führt es zu Veränderungen im Gerinnungssystem mit unterschiedlich schweren Ausprägungen. Das Endotoxin wird physiologisch im menschlichen Körper durch IgM neutralisiert. In dieser Studie wurde der Effekt von IgM angereichertem intravenösen Immunglobulin auf die Endotoxinaktivität untersucht. Zusätzlich wurden die Auswirkungen einer IgM-IVIg-Therapie auf Entzündungsparameter und auf viskoelastische und konventionelle Gerinnungsparameter betrachtet. Patienten mit schwerer Sepsis und septischem Schock auf einer anästhesiologisch-chirurgischen Intensivstation wurden rekrutiert. Nach dem Studieneinschluss von 15 Patienten erfolgte die Implementierung einer neuen SOP, in der die Anwendung von IgM-IVIg (5g/kg/d für 3 Tage) integriert wurde. Daraus bildeten sich eine Kontroll- und eine IgM-IVIg Gruppe. Der Beobachtungszeitraum umfasste 4 Tage. Es wurde der Endotoxin Activity Assay® (EAA®) zur Messung der Endotoxinaktivität an Vollblutproben durchgeführt. Die durchgeführte Rotationsthrombelastometrie ROTEM® diente neben der Messung der Gerinnungszeiten auch zur Erfassung der mechanischen und zeitlichen Stabilität eines Blutgerinnsels. Als Maß für die Aggregation von Thrombozyten diente die Impedanzaggregometrie Multiplate®. Die Routinelaborparameter wurden nach allgemeinem Standard erhoben. Eingeschlossen wurden die Daten von 26 Patienten. Die IgM-IVIg-Gruppe zeigte am ersten Tag, 6 und 12 Stunden nach Behandlungsbeginn, eine Reduktion der Endotoxinaktivität (0,51±0,06 vs. 0,26±0,07, p<0,05) und unterschied sich signifikant im Vergleich zur Kontrollgruppe 6 Stunden nach Behandlungsbeginn (0,26±0,07 vs. 0,43±0,07, p<0,05). Die Thrombozytenzahl war signifikant höher in der IgM-IVIg- Gruppe im Beobachtungszeitraum (200/nl±43 vs. 87/nl±20, p<0,05). Die Fibrinogenkonzentration war in der Kontrollgruppe am zweiten (311mg/dl±37 vs. 475mg/dl±47 (p=0,015)) und am vierten Tag (307mg/dl±35 vs. 420mg/dl±16 (p=0,017)) signifikant niedriger. Es konnten keine Unterschiede in den thromboelastometrischen oder aggregometrischen Untersuchungen, oder bei den Entzündungsparametern beobachtet werden. Die präsentierten Ergebnisse müssen aufgrund der geringen Stichprobengröße sorgsam interpretiert werden. Dennoch könnten die Ergebnisse die Basis für weitere Studien in der Zukunft sein, die auf IgM-IVIg als eine therapeutische Option bei Patienten mit einer hohen Endotoxinaktivität abzielen. In der vorliegenden Studie fanden wir Hinweise, dass eine IgM-IVIg-Therapie bei Patienten mit schwerer Sepsis und septischem Schock die Endotoxinaktivität vermindert. Zudem scheint IgM-IVIg bei o.g. Patienten eine pathognomonische Thrombozytopenie positiv zu modelieren.
Aims: Long non-coding RNAs (lncRNAs) have been shown to regulate numerous processes in the human genome, but the function of these transcripts in vascular aging is largely unknown. We aim to characterize the expression of lncRNAs in endothelial aging and analyse the function of the highly conserved lncRNA H19.
Methods and results: H19 was downregulated in endothelium of aged mice. In human, atherosclerotic plaques H19 was mainly expressed by endothelial cells and H19 was significantly reduced in comparison to healthy carotid artery biopsies. Loss of H19 led to an upregulation of p16 and p21, reduced proliferation and increased senescence in vitro. Depletion of H19 in aortic rings of young mice inhibited sprouting capacity. We generated endothelial-specific inducible H19 deficient mice (H19iEC-KO), resulting in increased systolic blood pressure compared with control littermates (Ctrl). These H19iEC-KO and Ctrl mice were subjected to hindlimb ischaemia, which showed reduced capillary density in H19iEC-KO mice. Mechanistically, exon array analysis revealed an involvement of H19 in IL-6 signalling. Accordingly, intercellular adhesion molecule 1 and vascular cell adhesion molecule 1 were upregulated upon H19 depletion. A luciferase reporter screen for differential transcription factor activity revealed STAT3 as being induced upon H19 depletion and repressed after H19 overexpression. Furthermore, depletion of H19 increased the phosphorylation of STAT3 at TYR705 and pharmacological inhibition of STAT3 activation abolished the effects of H19 silencing on p21 and vascular cell adhesion molecule 1 expression as well as proliferation.
Conclusion: These data reveal a pivotal role for the lncRNA H19 in controlling endothelial cell aging.