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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
通过听诊器听诊，当血液在异常心脏瓣膜处产生湍流时会出现血液湍流的杂音。当血液流经狭窄或不规则的动脉时听诊可闻及相似的声音称为杂音。颈动脉上的杂音提示血管内存在动脉粥样硬化，这是引起短暂性脑缺血发作或中风的主要危险因素。
音频由 Morton Tavel 医学博士提供。
