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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 ]
对于一度房室传导阻滞，心房（P 波）和心室（QRS 波）之间的传导减慢，但没有脱漏的搏动。
