患者,男,31岁,劳累时心悸,胸骨后疼痛2 年。查体可闻及主动脉瓣区收缩期粗糙的喷射性杂音,主动脉瓣区第二心音减弱。X 线检查示:左室扩大和升主动脉扩张。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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