• Can J Cardiol · May 1998

    Review Comparative Study

    The efficacy and safety of combination warfarin and ASA therapy: a systematic review of the literature and update of guidelines.

    • P Loewen, R Sunderji, and K Gin.
    • Vancouver Hospital, University of British Columbia, Vancouver. ploewen@unixg.ubc.ca
    • Can J Cardiol. 1998 May 1; 14 (5): 717-26.

    AbstractThe English-language literature was systematically reviewed to clarify the role of combination antithrombotic therapy with warfarin and acetylsalicylic acid (ASA) versus monotherapy with either agent, including data from several recently published trials. Sixteen published studies with evaluable efficacy and/or safety data were identified. For patients with prosthetic heart valves at high risk of thromboembolism, combined warfarin and ASA therapy may be beneficial compared with warfarin alone. Combination therapy may also be used for primary prevention in patients at high risk for ischemic heart disease, although the expected benefits are small. Evidence does not support the use of combined antithrombotic therapy in patients with established ischemic heart disease, ischemic stroke, coronary artery bypass grafts or atrial fibrillation. Combination therapy is associated with an increased risk of minor and major bleeding. The highest dose of ASA that can be recommended in combination with warfarin is 100 mg daily.

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