Publications by authors named "Petros S"

The most advanced monoclonal antibodies (mAbs) and vaccines against malaria target the central repeat region or closely related sequences within the circumsporozoite protein (PfCSP). Here, using an antigen-agnostic strategy to investigate human antibody responses to whole sporozoites, we identified a class of mAbs that target a cryptic PfCSP epitope that is only exposed after cleavage and subsequent pyroglutamylation (pGlu) of the newly formed N terminus. This pGlu-CSP epitope is not targeted by current anti-PfCSP mAbs and is not included in the licensed malaria vaccines.

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  • The proliferation of brain connectome data has allowed researchers to develop neural mass models that simulate whole brain activity, integrating interaction strength and tract lengths between regions.
  • A new neural mass model derived from spiking cortical cell networks can account for both chemical and electrical synapses, demonstrating its capability to replicate functional connectivity patterns observed in neuroimaging studies.
  • This study underlines the necessity of aligning theoretical models with biological principles and provides C++ code for efficient simulation of these neural mass networks, allowing for the exploration of delayed interactions within brain dynamics.
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  • The Total Thrombus-formation Analysis System (T-TAS) is an automated tool designed to evaluate thrombus (blood clot) formation under simulated blood flow conditions, particularly in patients receiving antiplatelet therapy.
  • This study examined T-TAS's effectiveness in detecting responses to dual antiplatelet therapy (DAPT) among 60 patients with peripheral artery disease (PAD) after a surgical procedure.
  • Findings indicated that the platelet-chip (PL-chip) of T-TAS was able to identify low responders to DAPT more effectively than traditional aggregation tests, suggesting it could be a useful tool for monitoring treatment responses in PAD patients.
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The COVID-19 pandemic had an unprecedented impact on the well-being of individuals working in the healthcare sector. Though many studies exist that focus on physician and nurse well-being, few have specifically identified stressors that affect professionals working within the end-of-life interdisciplinary team. The primary objective of this study was to expand research on moral distress and clinician well-being to include healthcare professionals working with patients with chronic and life-limiting illnesses during the COVID-19 pandemic.

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Background: Surviving sepsis can lead to chronic physical, psychological and cognitive impairments, which affect millions of patients worldwide, including survivors after COVID-19 viral sepsis. We aimed to characterize the magnitude and trajectory of functional dependence and new impairments post-sepsis.

Methods: We conducted a prospective cohort study including sepsis survivors who had been discharged from five German intensive care units (ICUs), until 36 months post-discharge.

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Background: The passive leg raising (PLR) test is a simple test to detect preload responsiveness. However, variable fluid doses and infusion times were used in studies evaluating the effect of PLR. Studies showed that the effect of fluid challenge on hemodynamics dissipates in 10 min.

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  • The study investigates how well the diluted Russel's Viper Venom Time (dRVVT) tests can detect leftover activity from direct oral anticoagulants (DOAC) in patients, aiming to find an efficient screening method for this purpose.
  • A total of 80 patients received one of four DOAC medications, and their blood was tested at various times to measure dRVVT alongside DOAC plasma levels.
  • Results show that while dRVVT is very effective at indicating significant levels of DOAC, especially with the LA2 assay, it can help in emergency settings to quickly assess anticoagulant effects and make treatment decisions.
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Background: Toxic renal effects of myoglobin following rhabdomyolysis can cause acute kidney injury (AKI) with the necessity of kidney replacement therapy (KRT). Fast elimination of myoglobin seems notable to save kidney function and intensify kidney repair. Clinical data regarding efficacy of KRT in critical care patients with rhabdomyolysis and AKI are limited.

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Introduction: Recombinant porcine factor VIII (rpFVIII) is a treatment option for break-through bleeds in patients with congenital haemophilia A with inhibitors (CHAwI) on emicizumab. However, there are limited data about the measurement of rpFVIII in the presence of emicizumab.

Aim: To analyse whether rpFVIII can be measured with a chromogenic assay with bovine component (bCSA) in plasma from CHAwI on emicizumab treatment.

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This second position paper of the Section Metabolism and Nutrition of the German Interdisciplinary Association for Intensive Care and Emergency Medicine (DIVI) provides recommendations on the laboratory monitoring of macro- and micronutrient intake as well as the use of indirect calorimetry in the context of medical nutrition therapy of critically ill adult patients. In addition, recommendations are given for disease-related or individual (level determination) substitution and (high-dose) pharmacotherapy of vitamins and trace elements.

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Background: The optimal dose of tinzaparin for prophylaxis in obese medical patients is not well defined.

Objectives: To evaluate the anti-Xa activity in obese medical patients on tinzaparin prophylaxis adjusted for actual bodyweight.

Methods: Patients with a body mass index of ≥30 kg/m treated with 50 IU/kg tinzaparin once daily were prospectively included.

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[Fluid and vasopressor therapy in sepsis].

Med Klin Intensivmed Notfmed

March 2023

Sepsis is one of the most common and lethal conditions in intensive care medicine. Besides adequate treatment of the infection, timely hemodynamic management is essential to treat tissue hypoperfusion due to sepsis. Adequate fluid resuscitation plays a central role, and this should be carried out with dynamic monitoring of the hemodynamic response.

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Thrombotic thrombocytopenic purpura (TTP), which comprises thrombocytopenia, elevated lactate dehydrogenase levels, and anemia in the combination of organ involvement, is a rare but life-threatening condition associated with an extremely high lethality in the acute phase if left untreated. Using the example of a 49-year-old woman admitted to the hospital with unexplained abdominal symptoms and subfebrile temperatures, recommendations for the emergency situation are presented. Increased awareness of the disease and targeted further diagnostics with determination of the PLASMIC score or ADAMTS13 activity may lead directly to diagnosis of TTP; delayed diagnosis is usually associated with secondary complications.

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Monitoring of vitamin K antagonist treatment with the international normalized ratio (INR) is obligatory, whereas this only applies to direct oral anticoagulants (DOAC) or low molecular weight heparin in the context of selected clinical scenarios. For DOAC the focus is on the determination of trough and peak plasma levels of the drug but for low molecular weight heparins the focus is on anti-Xa activity. The timing of blood sampling in relation to drug intake is essential for the interpretation of the results.

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  • The article is divided into two parts and explores coagulation diagnostics through five common clinical scenarios, focusing on the need for accurate bleeding assessments before invasive procedures.
  • Part 1 highlights that traditional tests like Quick and activated partial thromboplastin time are not reliable indicators of bleeding risk for elective interventions, as they often miss primary hemostasis disorders.
  • Acquired causes, such as the use of anticoagulants and certain diseases, are typically responsible for most clinical bleeding tendencies, making accurate preanalytical processing and contextual interpretation of test results crucial.
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At the time of admission to an intensive or intermediate care unit, assessment of the patients' nutritional status may have both prognostic and therapeutic relevance with regard to the planning of individualized medical nutrition therapy (MNT). MNT has definitely no priority in the initial treatment of a critically ill patient, but is often also neglected during the course of the disease. Especially with prolonged length of stay, there is an increasing risk of malnutrition with considerable prognostic macro- and/or micronutrient deficit.

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Chest compressions during cardiopulmonary resuscitation (CPR) may be associated with iatrogenic chest wall injuries. The extent to which these CPR-associated chest wall injuries contribute to a delay in the respiratory recovery of cardiac arrest survivors has not been sufficiently explored. In a single-center retrospective cohort study, surviving intensive care unit (ICU) patients, who had undergone CPR due to medical reasons between 1 January 2018 and 30 June 2019, were analyzed regarding CPR-associated chest wall injuries, detected by chest radiography and computed tomography.

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Background: The role of thrombolytic treatment in patients with intermediate high-risk pulmonary embolism (IHR-PE) remains controversial.

Objectives: In this study, we assessed whether systemic thrombolysis decreases hemodynamic decompensation and mortality in a cohort of unselected patients with IHR compared with patients with conventional anticoagulation.

Methods: Between January 2014 and December 2018, 137 patients with IHR-PE were identified among 539 consecutive patients treated for symptomatic PE.

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  • * It included plasma samples from 703 patients on rivaroxaban and 252 on apixaban, revealing significant correlations between DOAC levels and TG parameters, except for lag time with apixaban.
  • * The findings indicate that rivaroxaban has a stronger impact on TG compared to apixaban, particularly at higher plasma levels, with over 85% accuracy in predicting low DOAC levels based on normal TG parameters.
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Background: Patients with cancer are at increased risk of thromboembolic events contributing significantly to cancer-related morbidity and mortality. Because cholangiocarcinoma is a rare type of cancer, the incidence of thromboembolism in this patient population is not well defined.

Methods: Patients with cholangiocarcinoma treated at the University Cancer Center Leipzig between January 2014 and December 2018 were analyzed retrospectively regarding the incidence of arterial and venous thromboembolism.

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