This article demonstrates that the threshold response of initiation of blood clotting to the size of a patch of stimulus is a robust phenomenon under a wide range of conditions and follows a simple scaling relationship based on the Damköhler number. Human blood and plasma were exposed to surfaces patterned with patches presenting clotting stimuli using microfluidics. Perturbations of the comple...

In acute coronary events, plaque rupture and the subsequent formation of the catalytic tissue factor-factor VIIa complex is considered to initiate coagulation. It is unknown whether clotting factors XI and IX are activated in acute coronary events. Therefore, we prospectively investigated the activation of clotting factors XI and IX as well as activation of the contact system and the common pat...

BACKGROUND Russell's viper envenoming is a major problem in South Asia and causes venom induced consumption coagulopathy. This study aimed to investigate the kinetics and dynamics of venom and clotting function in Russell's viper envenoming. METHODOLOGY/PRINCIPAL FINDINGS In a prospective cohort of 146 patients with Russell's viper envenoming, we measured venom concentrations, international n...

Evidence for the involvement of the sixth component of complement (C6) in normal blood coagulation is provided by the description of a coagulation abnormality in rabbits with a genetic C6 deficiency and by its correction with highly purified preparations of C6. Whole blood clotting time in glass or plastic was prolonged and prothrombin consumption was decreased in blood from the deficient anima...

We have studied the platelet release reaction and thrombin generation during the spontaneous clotting of whole blood in vitro. Both thrombin formation and secretion of platelet Factor 4 were detected at least 12 min before clotting (clotting time, 22--26 min). Initially, at low thrombin concentrations (2--5 ng/ml), there is a small increase in plasma platelet Factor 4 (less than 1% of the amoun...

Clotting Factor VII activity emerges as a highly significant predictive factor for development of cardiovascular disease (CVD) In prospective trials. We have previously shown that In hypertriglyceridemlc Individuals a fraction of their clotting Factor VII molecules is present in an activated state In phosphollpase C-sensitive complexes in plasma. These complexes may explain the increased Factor...

Clotting Factor VII activity emerges as a highly significant predictive factor for development of cardiovascular disease (CVD) in prospective trials. We have previously shown that in hypertriglyceridemic individuals a fraction of their clotting Factor VII molecules is present in an activated state in phospholipase C-sensitive complexes in plasma. These complexes may explain the increased Factor...

Prothrombin complex concentrates are haemostatic blood products containing four vitamin K-dependent clotting factors (II, VII, IX and X). They are a useful, reliable and fast alternative to fresh frozen plasma for the reversal of the effects of oral anticoagulant treatments (vitamin K antagonists). They are sometimes used for factor II or factor X replacement in patients with congenital or acqu...