患者,男,29岁,劳动时常有胸闷、气短等症状,有时突然站起时会发生眩晕,甚至神志丧失。查体:胸骨左缘第3〜4肋间闻及Ⅲ级粗糙的喷射性收缩期杂音,超声心动图示室间隔肥厚。应考虑为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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