患者,男,41岁,活动后心悸、气喘1年余,查体轻度贫血,心率快,律整,胸骨右缘第2 肋间闻及响亮而粗糙的收缩期杂音(3/6 级),首先应想到的疾病为
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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