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Antithrombotic therapy for prosthetic heart valves: Indications

Authors
Gerard P Aurigemma, MD
Barbara A Konkle, MD
William H Gaasch, MD
Section Editors
Catherine M Otto, MD
Lawrence LK Leung, MD
Deputy Editors
Susan B Yeon, MD, JD, FACC
Jennifer S Tirnauer, MD

INTRODUCTION

Replacement of a diseased heart valve with a prosthetic valve aims to improve symptoms and prolong life but also exposes the patient to potential prosthesis-related complications. The frequency of serious complications depends upon the valve type and position, and other clinical risk factors. Complications include embolic events, bleeding, valve obstruction (due to thrombosis or pannus), infective endocarditis, structural deterioration (particularly for bioprosthetic valves), paravalvular regurgitation, hemolytic anemia, and patient-prosthesis mismatch.

Thromboembolic and anticoagulation-related problems are by far the most frequent complications of mechanical valves. The long-term risk of thromboembolism is generally lower with bioprosthetic valves, though there is an increased risk of thromboembolism for bioprosthetic as well as mechanical valves early after valve implantation.

This topic will review indications for antithrombotic therapy to reduce the risk of prosthetic valve thrombosis and thromboembolism [1-4]. Management of complications and procedures in patients receiving antithrombotic therapy for prosthetic valves, therapeutic use of warfarin, endocarditis prophylaxis, evaluation of valve function, complications of prosthetic valves (including valve obstruction), and management of antithrombotic therapy in pregnant patients with prosthetic heart valves are discussed separately. (See "Antithrombotic therapy for prosthetic heart valves: Management of bleeding and invasive procedures" and "Warfarin and other VKAs: Dosing and adverse effects" and "Antimicrobial prophylaxis for bacterial endocarditis" and "Complications of prosthetic heart valves" and "Overview of the management of patients with prosthetic heart valves" and "Management of pregnant women with prosthetic heart valves".)

GENERAL CONCEPTS

Commonly used agents

Anticoagulants - The anticoagulants used to prevent valve thrombosis and thromboembolic events in patients with prosthetic heart valves are vitamin K antagonists (VKA; generally for long-term therapy) and heparin (mainly unfractionated or low molecular weight heparin; generally for short-term bridging therapy), with indications as described below. (See 'Antithrombotic therapy according to valve type' below.)

Antiplatelet therapy - Aspirin is recommended as an antiplatelet agent in addition to anticoagulation in patients with mechanical valve prosthesis and is suggested in patients with bioprosthetic aortic or mitral valves.

                          

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Literature review current through: Apr 2016. | This topic last updated: May 23, 2016.
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