Publications by authors named "Jan Dirk Studt"

Article Synopsis
  • The study evaluates the diagnostic significance of two immunoassay tests for heparin-induced thrombocytopenia (HIT) using data from 1393 patients, aiming to clarify the reliability of test results across their ranges.
  • Findings reveal that while both assays correlate results to HIT diagnoses, the strength of this correlation differs, with the CLIA method showing a more pronounced increase in likelihood ratios compared to the ELISA method.
  • A web-based calculator is provided to help clinicians estimate the probability of HIT based on individual test results, enhancing decision-making in patient care.
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Article Synopsis
  • The study looked at how much blood patients lost during surgery if they had high levels of certain blood thinners called FXa inhibitors, without reversing their effects before surgery.
  • Researchers collected data from 32 patients who had emergency operations between 2018 and 2022 and found that blood loss was generally low, even with high levels of the medicine in their systems.
  • The results showed that one type of blood thinner caused a bit more blood loss than another, but overall, the method of waiting and monitoring worked fine, and no serious complications happened.
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Background: Fabry disease (FD) is an X-linked lysosomal storage disorder characterized by the progressive accumulation of globotriaosylceramide (Gb3) leading to systemic manifestations such as chronic kidney disease, cardiomyopathy, and stroke. There is still a need for novel markers for improved FD screening and prognosis. Moreover, the pathological mechanisms in FD, which also include systemic inflammation and fibrosis, are not yet fully understood.

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Article Synopsis
  • New analytical techniques allow for the simultaneous assessment of hundreds of proteins, helping to understand their roles in diseases like heparin-induced thrombocytopenia (HIT).
  • Researchers used four panels of the Olink proximity extension assay on patients suspected of HIT to identify potential new biomarkers related to thrombus formation, inflammation, and the immune response.
  • The study indicated that soluble P-selectin could serve as a significant marker for HIT, with future research planned to evaluate its diagnostic and prognostic value in patient care.
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Importance: Heparin-induced thrombocytopenia (HIT) is a life-threatening condition that requires urgent diagnostic clarification. However, knowledge of the diagnostic utility of the recommended diagnostic tests is limited in clinical practice.

Objective: To evaluate the current diagnostic practice for managing the suspicion of HIT.

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We describe the case of a 38-year-old man with a history of chronic portal vein thrombosis who presented with abdominal pain after a transjugular intrahepatic portosystemic shunt procedure. Under anticoagulation therapy with rivaroxaban, he experienced active splenic bleeding, leading to hemodynamic instability. Emergency interventions, including andexanet alfa and nanoparticle administration, successfully stopped the bleeding.

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Article Synopsis
  • * Caplacizumab, a new treatment that targets von Willebrand factor, isn't approved for use in pregnant or breastfeeding women but shows promise.
  • * A case report demonstrates successful off-label use of caplacizumab during a patient's pregnancy, leading to positive outcomes without major complications.
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Bleeding and thromboembolic (TE) complications in neurosurgical diseases have a detrimental impact on clinical outcomes. The aim of this study is to provide a scoping review of the available literature and address challenges and knowledge gaps in the management of coagulation disorders in neurosurgical diseases. Additionally, we introduce a novel research project that seeks to reduce coagulation disorder-associated complications in neurosurgical patients.

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Anticoagulants are essential in preventing and treating thrombosis. Unfortunately, their use is accompanied by an enhanced risk of bleeding. Since the introduction of direct oral anticoagulants (DOACs), the risk of major bleeding has been reduced but not eliminated.

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Article Synopsis
  • A universal calibrator for anti-Xa inhibitors was tested to improve laboratory accuracy for drugs like rivaroxaban, edoxaban, and apixaban.
  • A study involved 553 patients across nine centers, using the Technochrom anti-Xa assay with the Technoview edoxaban calibrator and liquid chromatography to measure drug concentrations.
  • Results showed high sensitivity (over 92%) and strong correlation (0.95) in detecting relevant drug levels, indicating effective performance of the universal assay.
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Background: COVID-19 is accompanied by a hypercoagulable state and characterized by microvascular and macrovascular thrombotic complications. In plasma samples from patients with COVID-19, von Willebrand factor (VWF) levels are highly elevated and predictive of adverse outcomes, especially mortality. Yet, VWF is usually not included in routine coagulation analyses, and histologic evidence of its involvement in thrombus formation is lacking.

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While implanted port catheters ("PORTs") have historically been the standard device for intravenous systemic anticancer therapy, the use of peripherally inserted central catheters (PICCs) has increased continuously and reliable catheter selection guidelines are lacking. We compare complication rates of PORTs and PICCs in cancer treatment in a retrospective study of 3365 patients with both solid organ (n = 2612) and hematologic (n = 753) malignancies, between 2001 and 2021. 26.

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Article Synopsis
  • The study investigates the correlation between three different tests for diagnosing heparin-induced thrombocytopenia (HIT) in a cohort of 1393 patients, revealing weak correlations among the tests used.
  • Only 8.5% (119 patients) were classified as HIT-positive, with notable differences in 4Ts scoring between HIT-positive and HIT-negative patients.
  • The inconsistent results suggested a need for standardizing these antibody assays to improve their accuracy and comparability in clinical practice.
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Therapeutic plasma exchange (TPE) is frequently performed in critical care settings for heterogenous indications. However, specific intensive care unit (ICU) data regarding TPE indications, patient characteristics and technical details are sparse. : We performed a retrospective, single-center study using data from January 2010 until August 2021 for patients treated with TPE in an ICU setting at the University Hospital Zurich.

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Article Synopsis
  • Diagnosing heparin-induced thrombocytopenia (HIT) is difficult at the bedside, leading to potential delays in diagnosis or overtreatment, and researchers aimed to improve this using machine-learning algorithms.
  • A study with 1393 patients from multiple centers found high accuracy in diagnosing HIT using a machine-learning tool that considered various clinical and lab factors, outperforming the current methods.
  • The machine-learning models significantly reduced false-negative and false-positive rates compared to the existing diagnostic algorithm, demonstrating their potential for better clinical outcomes in HIT diagnosis.
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Prothrombinase-induced clotting time (PiCT) is proposed as a rapid and inexpensive laboratory test to measure direct oral anticoagulant (DOAC) drug levels. In a prospective, multicenter cross-sectional study, including 851 patients, we aimed to study the accuracy of PiCT in determining rivaroxaban, apixaban, and edoxaban drug concentrations and assessed whether clinically relevant drug levels could be predicted correctly. Citrated plasma samples were collected, and the Pefakit PiCT was utilized.

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Background: Applying a single anti-Xa assay, calibrated to unfractionated heparin to measure rivaroxaban, apixaban, and edoxaban would simplify laboratory procedures and save healthcare costs.

Aim: We hypothesized that a heparin-calibrated anti-Xa assay would accurately measure rivaroxaban, apixaban, and edoxaban drug concentrations and correctly predict clinically relevant drug levels.

Methods: This analysis is part of the Simple-Xa study, a prospective multicenter cross-sectional study conducted in clinical practice.

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Background: The differential diagnosis of abdominal pain in pregnant women is broad. Liver diseases as the origin of abdominal pain in pregnancy are rare, and severe forms occur in less than 0.1% of pregnancies.

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Platelets interact with multiple adhesion proteins during thrombogenesis, yet little is known about their ability to assemble fibronectin matrix. In vitro three-dimensional superresolution microscopy complemented by biophysical and biochemical methods revealed fundamental insights into how platelet contractility drives fibronectin fibrillogenesis. Platelets adhering to thrombus proteins (fibronectin and fibrin) versus basement membrane components (laminin and collagen IV) pull fibronectin fibrils along their apical membrane versus underneath their basal membrane, respectively.

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The thrombin generation assay (TG) is a promising approach to measure the degree of anticoagulation in patients treated with direct oral anticoagulants (DOAC). A strong association with plasma drug concentrations would be a meaningful argument for the potential use to monitor DOAC. We aimed to study the correlation of TG with rivaroxaban, apixaban, and edoxaban drug concentrations in a large, prospective multicenter cross-sectional study.

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Immune thrombotic thrombocytopenic purpura (iTTP) is a life-threatening thrombotic microangiopathy. It is caused by a severe ADAMTS13 (a disintegrin and metalloprotease with thrombospondin type 1 motifs, 13) deficiency due to circulating autoantibodies, and is associated with significant morbidity and mortality. Current treatment options include plasma exchange, immunosuppression, and caplacizumab.

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Article Synopsis
  • The activation of platelets leads to a reorganization of their cytoskeleton, crucial for forming clots and healing wounds through adhesion to the extracellular matrix.
  • High-resolution structural details about how the platelet cytoskeleton facilitates cell spreading and adhesion are limited, despite their medical importance.
  • Using cryoelectron tomography, this study provides insights into membrane receptors and the actin network in platelets, revealing unique structural features that support the contractile forces necessary for effective cell adhesion.
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Robust viability assessment of grafts during normothermic liver perfusion is a prerequisite for organ use. Coagulation parameters are used commonly for liver assessment in patients. However, they are not yet included in viability assessment during ex situ perfusion.

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A universal anti-Xa assay for the determination of rivaroxaban, apixaban and edoxaban drug concentrations would simplify laboratory procedures and facilitate widespread implementation. Following two pilot studies analysing spiked samples and material from 698 patients, we conducted a prospective multicentre cross-sectional study, including 867 patients treated with rivaroxaban, apixaban or edoxaban in clinical practice to comprehensively evaluate a simple, readily available anti-Xa assay that would accurately measure drug concentrations and correctly predict relevant levels in clinical practice. Anti-Xa activity was measured by an assay calibrated with low-molecular-weight heparin (LMWH) in addition to ultra-high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS).

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