Search results
Results from the WOW.Com Content Network
VKAs diminish vitamin K levels in the body and inhibit the synthesis of vitamin K dependent clotting factors. [27] Thus, by inhibiting vitamin K, a key element by which the body produces clots, the risk of prolonged bleeding increases. [28] Traditionally, vitamin K has been used as a reversal agent for VKAs.
Phytomenadione, also known as vitamin K 1 or phylloquinone, is a vitamin found in food and used as a dietary supplement. [6] [7] It is on the World Health Organization's List of Essential Medicines. [8] It is used to treat certain bleeding disorders, [7] including warfarin overdose, vitamin K deficiency, and obstructive jaundice. [7]
The menadione core is apparent in the structure of vitamin K. It is an intermediate in the chemical synthesis of vitamin K by first reduction to the diol menadiol, which is susceptible to coupling to the phytol. [10] It is a useful intermediate for organic synthesis in general, as it can be made and modified in a number of ways. [11]
The term "vitamin K antagonist" is a misnomer, as the drugs do not directly antagonise the action of vitamin K in the pharmacological sense, but rather the recycling of vitamin K. Vitamin K is required for the proper production of certain proteins involved in the blood clotting process.
Vitamin K is a family of structurally similar, fat-soluble vitamers found in foods and marketed as dietary supplements. [1] The human body requires vitamin K for post-synthesis modification of certain proteins that are required for blood coagulation ("K" from Danish koagulation, for "coagulation") or for controlling binding of calcium in bones and other tissues. [2]
High doses of vitamin K should be avoided to reduce the time for rewarfarinisation once the stomach bleeding has stopped. Prothrombin complex concentrates are preferred for severe bleeding. Recombinant factor VIIa is reserved for life-threatening bleeding because of its high risk of thromboembolism. [ 15 ]
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
Vitamin K 1-deficiency may occur by disturbed intestinal uptake (such as would occur in a bile duct obstruction), by therapeutic or accidental intake of a vitamin K 1-antagonist such as warfarin, or, very rarely, by nutritional vitamin K 1 deficiency. As a result, Gla-residues are inadequately formed and the Gla-proteins are insufficiently active.