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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 ]
当脑血管存在异常、变得薄弱、或血压过高时,可发生出血性卒中。发生出血性中风时,出血可发生于脑实质内(脑出血)。出血也可能发生在覆盖脑部的内层和中间层组织之间(在蛛网膜下腔),称为蛛网膜下腔出血。