患者,女,19岁,平素体质差,曾有一次运动后晕厥史,查体发现胸骨左缘3~4肋间可闻及3/6级收缩期杂音,下蹲位时杂音减弱,应首先考虑的疾病是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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