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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 ]
外界空气通过咽鼓管进入中耳，以维持耳膜两侧的气压平衡。如果咽鼓管阻塞，空气不能进入中耳，中耳压力降低。中耳压力低于外耳道压力时，耳膜内陷。压差可能引起疼痛、鼓膜血肿或破裂。
