ONE of the landmarks in the history of the coagulation of the blood is the observation of Fredericq [1878] that heat coagulation occurs when the blood in the excised jugular of a horse is heated to 55-57°, after the subsidence of the' corpuscles. As the fibrinogens of the laboratory prepared by the method of Hammarsten [1879] and of'Schmidt [1892] coagulate at 560, it is commonly believed that ...

The inherent variability of conformational diseases is demonstrated by two families with different mutations of the same conserved aminoacid in antithrombin. Threonine 85 underlies the opening of the main beta-sheet of the molecule and its replacement, by the polar lysine, in antithrombin Wobble, resulted in a plasma deficiency of antithrombin with an uncharacteristically severe onset of thromb...

The heparin binding site of the anticoagulant protein antithrombin III (ATIII) has been defined at high resolution by alanine scanning mutagenesis of 17 basic residues previously thought to interact with the cofactor based on chemical modification experiments, analysis of naturally occurring dysfunctional antithrombins, and proximity to helix D. The baculovirus expression system employed for th...

INTRODUCTION Percutaneous coronary intervention (PCI) has changed significantly over the past decade with the uptake of radial access and the development of newer and more potent antiplatelets and safer antithrombins. This survey examined the default access route and pharmacology choice and their interaction in UK interventional practice. METHODS An email-based survey invited interventional c...

Few data are available on the risk of recurrent venous thromboembolism (VTE) associated with the rare inherited deficiencies of natural anticoagulants. We studied 602 patients with previous VTE: the incidence of first recurrence in the absence of anticoagulation was retrospectively estimated in 64 patients with deficiency of antithrombin (AT, n=14), protein C (PC, n=28), or protein S (PS, n=22)...

a-Thrombin derivatives obtained either by site-specific modification at lysyl residues (phosphopyridoxylated) or by limited trypsinolysis (yT-thrombin) were compared to correlate structural modifications with the functional reactivity toward fibrin(ogen) and heparin. a-Thrombin phosphopyridoxylated in the absence of heparin (unprotected) showed approximately 2 mol of label incorporated/mol of t...

Inactivation of thrombin (T) by the serpins heparin cofactor II (HCII) and antithrombin (AT) is accelerated by a heparin template between the serpin and thrombin exosite II. Unlike AT, HCII also uses an allosteric interaction of its NH(2)-terminal segment with exosite I. Sucrose octasulfate (SOS) accelerated thrombin inactivation by HCII but not AT by 2000-fold. SOS bound to two sites on thromb...

There is no consensus on the dose of low-molecular-weight (LMW) heparin for thromboprophylaxis in pregnant women at increased risk of thrombosis. Based upon monitoring with anti-factor Xa activity, the studies showed conflicting results suggesting either fixed dosages throughout the pregnancy or dosages adapted to the gestational age. We tested whether monitoring thromboprophylaxis with D-dimer...

In the course of a study of the blood coagulation reaction involving the use of partially purified reagents it was thought of some interest to determine effects of fibrinolytic enzyme on these isolated materials. It is well known that serum lysin (fibrinolysin, plasmin) will lyse or destroy both fibrinogen and fibrin. It may be thrombinolytic (1). Seegers and Loomis (2) have stated that it dest...

Dabigatran etexilate is a relatively new anticoagulant from the class of direct thrombin inhibitors which is administered orally and does not require routine blood work monitoring. Dabigatran may be attractive to both clinicians and patients because of both its convenience and efficacy; however, clinical complications are still being elucidated. Here, we present a previously unreported case of ...