• Kazuhiro Hashimoto.
• Department of Cardiovascular Surgery, Jikei University School of Medicine, Tokyo, Japan.
• Nihon Geka Gakkai Zasshi. 2007 Mar 1; 108 (2): 69-72.

AbstractThe use of bioprosthetic heart valves has dramatically increased over the last decade. In 2004, the ratio was 52% for mechanical and 48% for bioprosthetic valves in a survey by the Japanese Association for Thoracic Surgery. This increase in the use of bioprosthetic valves is related to evidence demonstrating the durability of such valves over the last 20 years. The guidelines of the Japanese Circulation Society recommend selection of prosthetic heart valves by considering the patient's age. In patients who received a mechanical valve in previous cardiac surgery, selection of another mechanical valve is inevitable. The age of 65 years is when patients are separated into groups receiving either mechanical (<64 years) or bioprosthetic (> or =65 years) valves. However, the evidence that a bioprosthetic valve is better for patients in their 60s is somewhat questionable, particularly in Japanese with a long life expectancy. Anticoagulation with warfarin in patients with mechanical valves leads to a higher incidence of hemorrhagic complications compared with bioprosthetic valves, although the incidence of thromboembolism is the same. Thus patients with contraindications to warfarin or a low risk of thromboembolism who are more than 65 years old are reasonable candidates for a bioprosthetic valve. It is also recommended that women of childbearing age receive bioprosthetic valves after being informed of the possibility and risks of reoperation. In addition to the information in the guidelines and physicians' preference for valve selection, factors such as the patient's lifestyle, wishes, cardiac function, other complications, and longevity must always be considered when selecting a valve prosthesis.

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