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单项选择题

患者,男性,28岁,2小时前在打篮球感胸闷、胸痛,随即意识丧失,约3分钟清醒。既往体健。父亲3年前猝死,其兄有类似发作。查体:神志清,脉搏66次/分,血压120/75mmHg,双肺未闻及啰音,心界无扩大,胸骨左缘第3~4肋间可闻及粗糙的喷射性收缩期杂音。

最大可能的诊断为

A.室间隔缺损
B.肥厚型心肌病
C.风湿性心脏病
D.不稳定型心绞痛
E.二尖瓣脱垂
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