患者、男、30岁,常感疲乏无力,劳累后感胸骨后疼痛,主动脉瓣区喷射性粗糙的收缩期杂音,主动脉瓣第三心音减弱,脉搏细弱,X线检查有左心室肥厚及升主动脉扩张,可能的诊断是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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