In: Anatomy and Physiology
Anabelle is a 70-year old female with a history of atrial fibrillation. This condition puts her at risk for an embolic stroke. Her physician prescribed her the “blood thinner” coumadin. Her physician advised her to limit her intake of kale, spinach and similar vegetables. Why was she given this advice? What test must she have routinely done to assure therapeutic levels of this medication. What is the mechanism of action for coumadin?
Kale, spinach and similar vegetable are rich in vitamin K, these vitamin K works against drugs like coumadin which mainly contains Warfarin. Vitamin K aids clotting, so patients on the anti-clotting drug like warfarin are often warned by their physicians to limit the amount of foods rich in the nutrient.The blood test, called prothrombin time, is used to calculate your International Normalized Ratio (INR). Your INR helps your healthcare provider determine how well warfarin is working to prevent blood clots and if the dose needs to be adjusted.
Liver produces certain co factors which are responsible for clotting, Vitamin K controls the creation of these cofactors in your liver, a drug like coumadin work by competitively inhibits the vitamin K epoxide reductase complex (VKORC1), which is an essential enzyme responsible for activating the vitamin K available in the body, this can deplete functional vitamin K reserves and therefore reduce the synthesis of active clotting factors. By blocking the process early on, coumadin ultimately help to reduce blood clots from forming in your body.