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Institute
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Hintergrund. Die Achtung der individuellen Autonomie ist eines von vier medizinethischen Prinzipien, das im Kontext von Medizin und Forschung insbesondere in Bezug auf die informierte Einwilligung einer Person thematisiert wird. Menschen mit Demenz können aufgrund innerer oder äußerer Faktoren in ihrer Einwilligungsfähigkeit beeinträchtigt sein, was zu einer Einschränkung ihres Rechts auf Selbstbestimmung führen kann. Im diesbezüglichen Spannungsfeld zwischen Fürsorge und Autonomie soll Entscheidungsassistenz zur Ermöglichung selbstbestimmter Entscheidungen beitragen.
Zielrichtung der Arbeit. Ziel der vorliegenden Dissertation ist die Definition, Implementierung und Evaluation von Entscheidungsassistenzmaßnahmen für Menschen mit Demenz, um deren Autonomie in Entscheidungsprozessen zu unterstützen. Drei Teilprojekte umfassen die Ermittlung des internationalen Forschungsstands zu Entscheidungsassistenz bei Demenz, die Definition und Pilotierung von Unterstützungstools in der Praxis und die Analyse des individuellen Erlebens der vereinfachten Aufklärungsgespräche durch Menschen mit Demenz.
Methode. Im ersten Teilprojekt wurde eine am PRISMA-Standard orientierte systematische Literaturrecherche in Medline und PsycINFO durchgeführt. Die extrahierten relevanten Informationen wurden inhaltlich systematisiert. Aufbauend auf diesen Ergebnissen wurden im zweiten Teilprojekt konkrete Unterstützungstools definiert und in reale Aufklärungsgespräche (Lumbalpunktion) implementiert. Die Tools wurden in der Pilotierung in der Praxis sowie in einem iterativen Diskussionsprozess mit Experten weiterentwickelt. Im dritten Teilprojekt wurde das individuelle Erleben der Teilnehmer der vereinfachten Aufklärungsgespräche mittels problemzentrierter Interviews untersucht und die Daten einer qualitativen Inhaltsanalyse unterzogen.
Ergebnisse. Die Datenbankrecherche ergab initial 2348 Treffer. Nach Screenings der Titel, Abstracts und Volltexte konnten 11 Artikel eingeschlossen werden. Vier der eingeschlossenen Studien sind Interventionsstudien, die übrigen sieben qualitative Interviewstudien. Die identifizierten Unterstützungsmaßnahmen wurden zunächst den beiden Kategorien Interventionen und Strategien und anschließend unter Zuhilfenahme des Konzepts des Contextual Consents fünf komplexitätssteigernden Dimensionen einer Entscheidungssituation zugeordnet (individuelle, soziale, medizinische, informationelle und Folgendimension). Darauf aufbauend wurden im zweiten Teilprojekt acht Entscheidungsassistenzmaßnahmen abgeleitet: (1) Gesprächsstruktur, (2) Elaborierte klare Sprache, (3) Ambiente / Raumgestaltung, (4) Stichwortlisten, (5) Prioritätenkarten, (6) Visualisierung, (7) Vereinfachte schriftliche Einverständniserklärung sowie (8) Personenzentrierte Haltung des Entscheidungsassistenten (1-7: Tools, 8: Grundeinstellung). Die Tools zielen überwiegend auf eine Komplexitätsreduktion in der informationellen Dimension unter Berücksichtigung der fähigkeitsbezogenen und der bedürfnisbezogenen individuellen Dimension ab. Durch Anpassungen der Informationsdarbietung oder der kommunikativen Interaktion im Gespräch dienen sie mehrheitlich der Förderung des (Informations-) Verständnisses. Die Analyse der qualitativen Daten im dritten Teilprojekt zeigt, dass die Erfahrung der vereinfachten Aufklärungsgespräche durch drei übergreifende Themen gekennzeichnet ist. Die Kategorie Formalität versus Informationsgewinn illustriert die individuelle Bedeutung des Aufklärungsgesprächs für die Teilnehmer und deren Bewertung des Prozesses der informierten Einwilligung. Die Kategorie Wahrnehmung der Unterstützung skizziert die Bewertungen der angewandten Unterstützungstools durch die Teilnehmer. Die Kategorie Der Wahrheit ins Auge sehen müssen stellt dar, dass die erlebte Situation des vereinfachten Aufklärungsgesprächs wesentlich durch die Verdachtsdiagnose Demenz bestimmt ist, die im Rahmen aller Aufklärungsgespräche besprochen wurde.
Fazit. Bislang gibt es wenig empirische Forschung zu Entscheidungsassistenz für Menschen mit Demenz und Unterstützungsmaßnahmen werden überwiegend unsystematisch entwickelt und angewendet. Die Wirksamkeit einzelner Unterstützungsmaßnahmen kann aufgrund fehlender Interventionsstudien selten beurteilt werden. Unterstützungsmaßnahmen zielen überwiegend auf eine Komplexitätsreduktion in der Informationsdarbietung und im kommunikativen Interaktionsprozess ab, wobei sie kognitive Beeinträchtigungen und Interaktions-/ Entscheidungsbedürfnisse von Menschen mit Demenz berücksichtigen. Die definierten Tools können als erste konkret handhabbare Werkzeuge verstanden werden, die das strukturierte Leisten von Entscheidungsassistenz für Menschen mit Demenz erleichtern sollen. Sie sind übertragbar auf verschiedene Entscheidungssituationen. Eine Bewertung der Wirksamkeit der definierten Tools sollte in weiteren Entscheidungssituationen und mit größeren Stichproben weiteruntersucht werden. Die Ergebnisse der Evaluation liefern jedoch erste Hinweise darauf, dass einige Teilnehmer sich von einzelnen Tools unterstützt gefühlt haben und die anvisierte Komplexitätsreduktion in der informationellen Dimension in einigen Fällen erfolgreich war. Eine wesentliche Komplexitätssteigerung in der untersuchten Entscheidungssituation entstand durch die negative Emotionen auslösende Vermittlung einer potentiellen Demenzdiagnose (Folgendimension). Dieses Ergebnis impliziert, dass die definierte „verständnisfördernde Toolbox“ um Unterstützungsmaßnahmen zur emotionalen Entlastung von Menschen mit Demenz erweitert werden muss, da davon ausgegangen werden kann, dass vielfältige Entscheidungssituationen für Menschen mit Demenz emotional hoch belastend sind.
100 Jahre Dieter Janz
(2020)
The 20 April 2020 marks the centenary of Dieter Janz’s birth. This issue of Zeitschrift für Epileptologie is published in his honor with the aim of tracing the work of Dieter Janz over the last five decades and summarizing new findings on the Janz syndrome (Juvenile Myoclonic Epilepsy), which is named after him.
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.
In this paper we present a new approach to deterministic modelling of COVID-19 epidemic. Our model dynamics is expressed by a single prognostic variable which satisfies an integro-differential equation. All unknown parameters are described with a single, time-dependent variable R(t). We show that our model has similarities to classic compartmental models, such as SIR, and that the variable R(t) can be interpreted as a generalized effective reproduction number. The advantages of our approach are the simplicity of having only one equation, the numerical stability due to an integral formulation and the reliability since the model is formulated in terms of the most trustable statistical data variable: the number of cumulative diagnosed positive cases of COVID-19. Once this dynamic variable is calculated, other non-dynamic variables, such as the number of heavy cases (hospital beds), the number of intensive-care cases (ICUs) and the fatalities, can be derived from it using a similarly stable, integral approach. The formulation with a single equation allows us to calculate from real data the values of the sample effective reproduction number, which can then be fitted. Extrapolated values of R(t) can be used in the model to make reliable forecasts, though under the assumption that measures for reducing infections are maintained. We have applied our model to more than 15 countries and the ongoing results are available on a web-based platform [1]. In this paper, we focus on the data for two exemplary countries, Italy and Germany, and show that the model is capable of reproducing the course of the epidemic in the past and forecasting its course for a period of four to five weeks with a reasonable numerical stability.
Purpose: Auditory functional MRI (fMRI) often uses silent inter-volume delays for stimulus presentation. However, maintaining the steady-state of the magnetization usually requires constant delays. Here, a novel acquisition scheme dubbed “pre-Saturated EPI using Multiple delays in Steady-state” (SEPIMS) is proposed, using spin saturation at a fixed delay before each volume to maintain steady-state conditions, independent of previous spin history. This concept allows for variable inter-volume delays and thus for flexible stimulus design in auditory fMRI. The purpose was to compare the signal stability of SEPIMS and conventional sparse EPI (CS-EPI). Methods: The saturation module comprises two non-selective adiabatic saturation pulses. The efficiency of the saturation and its effect on the SEPIMS signal stability is tested in vitro and in vivo. Results: Data show that SEPIMS yields the same signal stability as CS-EPI, even for extreme variations between inter-volume delay durations. However, dual saturation pulses are required to achieve sufficiently high saturation efficiency in compartments with long T1 values. Importantly, spoiler gradient pulses after the EPI readout have to be optimized to avoid eddy-current-induced image distortions. Conclusion: The proposed SEPIMS sequence maintains high signal stability in the presence of variable inter-volume durations, thus allowing for flexible stimulus design.
Background: Brodalumab is a fully human monoclonal immunoglobulin IgG2 antibody that binds to the human IL-17 receptor subunit A and by that inhibits the biologic action of IL-17A, IL-17F, IL-17C and IL-17E. Therapy with fumaric acid esters (FAE) is a well established and widely used first-line systemic treatment for subjects with moderate-to-severe plaque psoriasis. Objectives: To compare brodalumab to FAE in terms of clinical efficacy, patient-reported outcomes and safety in subjects with moderate-to-severe plaque psoriasis who were naïve to systemic treatment. Methods: Eligible subjects were randomized 1 : 1 to 210 mg brodalumab injections or oral FAE according to product label in this 24-week, open-label, assessor-blinded, multi-centre, head-to-head phase 4 trial. The primary endpoints were having PASI75 and having sPGA score of 0 or 1 (sPGA 0/1). Subjects with missing values for the primary endpoints were considered non-responders. Results: A total of 210 subjects were randomized. 91/105 subjects completed brodalumab treatment and 58/105 subjects completed FAE treatment. At Week 24, significantly more subjects in the brodalumab group compared to the FAE group had PASI75 (81.0% vs. 38.1%, P < 0.001) and sPGA 0/1 (64.8% vs. 20.0%, P < 0.001). In the brodalumab group, the median time to both PASI75 and to PASI90 was significantly shorter than in the FAE group (4.1 weeks vs. 16.4 weeks, and 7.4 weeks vs. 24.4 weeks, respectively, P < 0.0001 for both). The rate of adverse events was lower in subjects treated with brodalumab compared to subjects treated with FAE (616.4 vs. 1195.8 events per 100 exposure years). No new safety signals were detected for brodalumab. Conclusions: Brodalumab was associated with rapid and significant improvements in signs and symptoms of moderate-to-severe plaque psoriasis, with a superior efficacy profile to what was observed with FAE in systemic-naïve subjects over 24 weeks.
Background: Combined inhibition of phosphatidylinositol 3-kinase (PI3K) and the mammalian target of rapamycin (mTOR) complexes may be an efficient treatment for acute leukemia. The primary objective of this phase I single center open label study was to determine the maximum tolerated dose (MTD) and recommended phase II dose (RP2D) of the dual pan-class I PI3K and mTOR inhibitor BEZ235 in patients with advanced leukemia.
Methods: Herein patients > 18 years of age who had relapsed or showed refractory leukemia were treated with BEZ235 (orally at 300–400 mg BID (cohort − 1/1)) to assess safety, tolerability, preliminary efficacy and pharmacokinetic (PK). Adverse events data and serious adverse events were analyzed and haematological and clinical biochemistry toxicities were assessed from laboratory test parameters. Response was assessed for the first time at the end of cycle 1 (day 29) and after every subsequent cycle. Pharmacokinetic and pharmacodynamic analyses of BEZ235 were also included (BEZ235 plasma levels, phosphorylation of AKT, S6 and 4EBP1). On statistics this trial is a multiple ascending dose study in which a following variant of the 3 + 3 rule (“Rolling Six”), a minimum of 6 and a maximum of 12 patients was recruited for the dose escalation and another 5 were planned for the expansion phase.
Results: Twenty-four patients with ALL (n = 11) or AML (n = 12) or CML-BP (n = 1) were enrolled. All patients had failed one (n = 5) or more lines of therapy (n = 5) and 14 patients were in refractory / refractory relapse. No formal MTD was defined, stomatitis and gastrointestinal toxicity at 400 mg BID dose was considered incompatible with prolonged treatment. The RP2D of BEZ235 was defined as 300 mg BID. Four of 24 patients showed clinical benefit. Twenty-two of 24 patients discontinued because of progression, (median time to progression 27 days (4d-112d). There was no association between PK parameters and efficacy or tolerability.
Conclusions: Combined inhibition of PI3K and mTOR inhibits a clinically meaningful driver pathway in a small subset of patients with ALL, with no benefit in patients with AML.
Trial registration: ClinicalTrials.gov, identifier NCT01756118. retrospectively registered 19th December 2012, https://clinicaltrials.gov/ct2/show/NCT01756118.
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.