Heparin also works by preventing certain cofactors, namely thrombin and fibrin, from working correctly. These proteins are called “cofactors.” Vitamin K controls the creation of these cofactors in your liver, and warfarin reduces clotting in your blood by preventing vitamin K from working correctly. Warfarin and heparin work in slightly different ways, but both block the production of certain proteins in your liver that work together to help your blood to clot. Blood clots can cut off circulation to your arms, legs, lungs (pulmonary embolism), brain (stroke), and heart (heart attack). It is rare for a blood clot to migrate to another part of the body and block one of your blood vessels, but if it does (a condition doctors call a thromboembolism), it is always serious. Sometimes these antiphospholipid antibodies (called anticardiolipin, lupus anticoagulant, or anti-beta2glycoprotein I) can lead to blood clots-thromboses-such as deep venous thrombosis, stroke, or heart attack.Ī blood clot by itself is called a thrombus a blood clot that breaks off and travels elsewhere in your circulatory (blood) system is called an embolus. ![]() ![]() About one-third of people with lupus have antibodies to molecules in the body called phospholipids. Warfarin (Coumadin) and heparin are anticoagulants (“blood thinners”), medications that decrease the ability of the blood to clot. Fondaparinux (Arixtra) What are anticoagulants and why are they used in lupus treatment?
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