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### Preamble ### Preamble It is important that the medical profession play a significant role in critically evaluating the use of diagnostic procedures and therapies in the management or prevention(More)
BACKGROUND Mechanical heart valves are durable but thrombogenic, and their use requires that the patient receive anticoagulants. In contrast, bioprosthetic valves are less thrombogenic, but they have(More)
This executive summary and recommendations appears in the November 3, 1998, issue of Circulation . The guidelines in their entirety, including the ACC/AHA Class I, II, and III recommendations, are(More)