Related Experiment Video
Updated: Aug 21, 2026

Determination of the Procoagulant Activity of Extracellular Vesicle (EV) Using EV-Activated Clotting Time (EV-ACT)
Published on: August 4, 2023
[Acquired blood coagulation disorders]
1Charité, Campus Virchow-Klinikum, Medizinische Klinik mit Schwerpunkt Hämatologie und Onkologie, Augustenburger Platz 1, 13353 Berlin, Germany.
Abstract:
Acquired coagulopathies regularly result from underlying diseases such as liver failure or sepsis. Optimal treatment of these underlying diseases defines longterm prognosis. In a few coagulopathies, such as immunocoagulopathies, in a relevant portion of patients an underlying disease cannot be identified. Therapeutic modulation of haemostasis aiming at the prevention of fatal bleeding or thromboembolism is able to improve the prognosis of patients with acquired coagulopathies. Most often this is the result of individualized, lab-controlled treatments, which are difficult to be studied. Within the last years the role of therapeutic modulation of haemostasis to reduce mortality was successfully studied for the first time in the frame of randomized placebo-controlled phase III studies.
Related Concept Videos
Disorders of Hemostasis
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
Anticoagulant Drugs: Low-Molecular-Weight Heparins
Coagulation
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...
Coagulation
Extrinsic and Intrinsic Pathways of Hemostasis
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Blood Transfusion and Agglutination
History
The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...

