Objective: To sum up clinical experience of 256 cases patients over 65-year-old with artificial heart valve replacement surgery.
目的：总结256例65岁以上患者行人工心脏瓣膜置换手术的临床经验。
Objective To determine the surgical point and technique of artificial mechanical valve replacement in children with heart valve diseases.
目的：探讨儿童心脏瓣膜病的人工机械瓣膜置换手术要点及方法。
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