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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 ]
肺静脉未连接至左心房;相反,整个肺静脉回流通过各种连接进入全身静脉循环(在这种情况下,连接静脉位于心脏上部或心脏上方)。连接静脉也可以位于心脏下方(心脏下)或心脏后面。全身血流取决于从右到左的心房分流。
AO = 主动脉;IVC = 下腔静脉;LA = 左心房; LV = 左心室;PA = 肺动脉;PV = 肺静脉;RA = 右心房;RV = 右心室;SVC = 上腔静脉。