Search results for "Thromboplastin"
showing 9 items of 49 documents
D-Dimer, Thrombin-Antithrombin III-Komplex (TAT) und Prothrombinfragment 1+2 (PTF)
1997
Two groups of 15 patients each with disseminated intravascular coagulation in association with septic disease were treated with low-molecular-weight heparin (lmw-heparin) in different dosages (group I: 1.5-5 IE/kg body weight (BW) per hour; group II: 8-15 IE/kg BW). We studied the levels of D-dimer, thrombin-antithrombin III complex (TAT), prothrombin fragments 1 and 2 (PTF), and global tests of coagulation like prothrombin time (PT), activated partial thromboplastin time (PTT), thrombin time (TT) and platelet count, plasminogen activation (PA) and fibrinogen concentration to estimate the success of heparin therapy in the two groups. TT and fibrinogen concentration were not suitable to foll…
Factor VIIa-induced interaction with integrin controls the release of tissue factor on extracellular vesicles from endothelial cells.
2019
Essentials Prothrombotic extracellular vesicles (EV) carry agonist pathway-specific proteomes Agonists for protease activated receptor (PAR) 2 signaling have distinct effects on EV composition PAR2 signaling rapidly generates prothrombotic EV and slowly EV with inactive tissue factor (TF) FVIIa integrin ligation restricts TF incorporation into EV from endothelial cells SUMMARY: Background Cell injury signal-induced activation and release of tissue factor (TF) on extracellular vesicles (EVs) from immune and vessel wall cells propagate local and systemic coagulation initiation. TF trafficking and release on EVs occurs in concert with the release of cell adhesion receptors, including integrin …
A perioperative uncontrollable bleeding in an elderly patient with acquired hemophilia A: a case report
2013
Key Clinical Message Acquired hemophilia A should be taken into account in the differential diagnosis of perioperative bleeding in patients without any apparent reason for activated partial thromboplastin time prolongation.
Von Willebrand-Syndrom - Blutungsrisiko bei HNO-Eingriffen im Kindesalter
1994
Von Willebrand's disease (vWD) is the most common inherited bleeding disorder. Typical clinical features such as bleeding after surgery or trauma might suggest the disease. We present a series of 24 patients with vWD treated between 1989 and 1992. Diagnosis was confirmed by a reduction in plasma factor VIII antigen concentration, reduction of ristocetin cofactor activity and reduced factor VIII activity. Seventeen of the patients underwent surgery (7 adenoidectomies, 8 tonsillectomies, 2 paranasal sinus operations) and received preoperative stimulation of von Willebrand factor (vWF) using DDAVP. This resulted in a rapid increase in plasma vWF concentration from an average of 56% before stim…
Complement C5 but not C3 is expendable for tissue factor activation by cofactor-independent antiphospholipid antibodies
2018
The complement and coagulation cascades interact at multiple levels in thrombosis and inflammatory diseases. In venous thrombosis, complement factor 3 (C3) is crucial for platelet and tissue factor (TF) procoagulant activation dependent on protein disulfide isomerase (PDI). Furthermore, C5 selectively contributes to the exposure of leukocyte procoagulant phosphatidylserine (PS), which is a prerequisite for rapid activation of monocyte TF and fibrin formation in thrombosis. Here, we show that monoclonal cofactor-independent antiphospholipid antibodies (aPLs) rapidly activate TF on myelomonocytic cells. TF activation is blocked by PDI inhibitor and an anti-TF antibody interfering with PDI bin…
Severe plasma prekallikrein deficiency : clinical characteristics, novel KLKB1 mutations, and estimated prevalence
2020
BACKGROUND Severe plasma prekallikrein (PK) deficiency is an autosomal-recessive defect characterized by isolated activated partial thromboplastin time prolongation. To date, no comprehensive methodologically firm analysis has investigated the diagnostic, clinical, and genetic characteristics of PK deficiency, and its prevalence remains unknown. PATIENTS/METHODS We described new families with PK deficiency, retrieved clinical and laboratory information of cases systematically searched in the (gray) literature, and collected blood of these cases for complementary analyses. The Genome Aggregation Database (gnomAD) and the population-based Gutenberg Health Study served to study the prevalence …
c.451dupT in KLKB1 is common in Nigerians, confirming a higher prevalence of severe prekallikrein deficiency in Africans compared to Europeans
2020
Essentials Prekallikrein (PK) deficiency is a recessive trait with isolated aPTT prolongation. KLKB1 c.451dupT is common in Nigerians (7/600 alleles) and absent in a European group (0/600). To date, all genotyped PK-deficient patients of African ancestry were homozygous for 451dupT. Diagnostics of isolated aPTT prolongation in African descendants should include PK testing. ABSTRACT: Background Severe prekallikrein deficiency (PK deficiency) is an autosomal-recessive condition thought to be very rare. Recently we reported that the previously unnoticed variant c.451dupT, p.Ser151Phefs*34 in KLKB1, which is listed in databases aggregating genome data, causes PK deficiency and is common in Afri…
Minimalheparinisierung bei Dialysepatienten mit erhöhter Blutungsgefährdung
2008
Abstract In 78 patients (47 men, 31 women; mean age 53 [22-78] years) 174 dialyses were undertaken within one week of a bleeding episode or a diagnostic or therapeutic procedure which may cause bleeding. Minimal anticoagulation with low molecular weight heparin (LMWH) was the aim, using a biocompatible dialyser. During the dialysis coagulation was controlled by global tests (Quick value/international normalized ratio [INR], partial thromboplastin time, thrombin time, antifactor Xa activity), by molecular markers of clotting activity (thrombin-antithrombin III complex [TAT], D-dimers), as well as measurement of elastase (elastase-alpha 1-protein inhibitor complex). The LMWH dosage averaged 9…
Intravenous thrombolysis for acute ischaemic stroke in patients on direct oral anticoagulants.
2018
BACKGROUND AND PURPOSE Whereas intravenous thrombolysis (IVT) is allowed for acute ischaemic stroke in patients on vitamin K antagonists with international normalized ratio ≤1.7, there are no similar recommendations for patients on direct oral anticoagulants (DOACs), notably due to the lack of coagulation tests to assess the therapeutic effects. Although the literature is scarce, consisting of small case series and retrospective studies, considering the frequency of this situation the French Vascular Neurology Society and the French Study Group on Haemostasis and Thrombosis have worked on a joint position paper to provide a practical position regarding the emergency management of ischaemic …