This trial is a multinational, multicenter, randomized, open-label, active-controlled clinical trial comparing the safety of aspirin versus vitamin K antagonists (warfarin) as oral antithrombotic therapy during the initial 6 months following tissue valve replacement (aortic or mitral).
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A composite endpoint is defined as a single outcome that combines multiple clinical events; the occurrence of any one of the component events is considered as meeting the endpoint.
Timeframe: From registration to 6 months