患者,男,64岁,头晕、心悸4〜5年,心尖搏动向左下移位,呈抬举性搏动,于胸骨左缘第3、4肋间闻及叹气样舒张期杂音,为递减型,向心尖传导,在心尖区闻及隆隆样舒张早期杂音,股动脉可闻及枪击音,首先应想到的诊断为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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