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Warfarin is one of several drugs often referred to as a "blood thinner"; this is not technically correct, as these drugs reduce coagulation of blood, increasing the clotting time, without affecting the viscosity ("thickness") as such of blood. [84] Warfarin inhibits the vitamin K-dependent synthesis of biologically active forms of the clotting ...
Vitamin K antagonists (VKA) are a group of substances that reduce blood clotting by reducing the action of vitamin K. The term "vitamin K antagonist" is technically a misnomer, as the drugs do not directly antagonize the action of vitamin K in the pharmacological sense, but rather the recycling of vitamin K. Vitamin K antagonists (VKAs) have ...
Prior to the introduction of direct factor Xa inhibitors, vitamin K antagonists such as warfarin were the only oral anticoagulants for over 60 years, and together with heparin have been the main blood thinners in use. People admitted to hospital requiring blood thinning were started on an infusion of heparin infusion, which thinned blood ...
He also notes that watercress' high vitamin K content can interact with certain medications, especially blood thinners like warfarin (Coumadin). "Vitamin K plays a vital role in blood clotting, so ...
4-Hydroxycoumarins are a class of vitamin K antagonist (VKA) anticoagulant drug molecules. Chemically, they are derived from coumarin by adding a hydroxy group at the 4 position to obtain 4-hydroxycoumarin , then adding a large aromatic substituent at the 3-position (the ring-carbon between the hydroxyl and the carbonyl).
Warfarin, a synthetic derivative of coumarin, is the most widely used oral anticoagulant in the US. In some European countries, other coumarin derivatives (phenprocoumon and acenocoumarol) are used. These agents known as vitamin K antagonists (VKA), inhibit the vitamin K-dependent carboxylation of Factors II (prothrombin), VII, IX, X in the ...
Lengyel M (December 2004). "[Warfarin or acenocoumarol is better in the anticoagulant treatment of chronic atrial fibrillation?]". Orvosi Hetilap. 145 (52): 2619– 2621. PMID 15724697. Ufer M (2005). "Comparative pharmacokinetics of vitamin K antagonists: warfarin, phenprocoumon and acenocoumarol". Clinical Pharmacokinetics. 44 (12): 1227– 1246.
The reduction of vitamin K epoxide is then responsible for the carboxylation of glutamic acid residues in some blood-clotting proteins, including factor VII, factor IX, and factor X. [5] [7] VKORC1 is of therapeutic interest both for its role in contributing to high interpatient variability in coumarin anticoagulant dose requirements and as a ...
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