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  • Title: Heparin and warfarin: use of anticoagulants in the prevention and treatment of venous thrombosis and pulmonary embolism.
    Author: Rosen RL.
    Journal: J Fam Pract; 1979 May; 8(5):923-7. PubMed ID: 438753.
    Abstract:
    The physician frequently encounters the problems of deep vein thrombosis and pulmonary embolism. Recently, a number of studies have been published which are of considerable help in the management of these disorders. It has been shown that in many cases, low-dose heparin is effective in the prevention of both venous thrombosis and pulmonary embolism. However, once venous thrombosis has already occurred, it is necessary to use full-dose heparin, preferably by the continuous intravenous route, with maintenance of the partial thromboplastin time (PTT) at 1 1/2 times the control at all times. Although monitoring the PTT may not prevent hemorrhage, it will help prevent further thrombosis. Heparin is generally continued for seven to ten days. During this time warfarin is generally begun, and it is important to continue the patient on warfarin for five to seven days while the patient is receiving intravenous heparin therapy. After stopping heparin, oral anticoagulation with warfarin should be continued for six weeks. Then, in the absence of a previous history of venous thromboembolism or a known predisposing condition, it is safe to abruptly discontinue anticoagulation in most patients.
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