三尖瓣狭窄的最常见病因仍为风湿热,常伴关闭不全、二尖瓣和主动脉瓣损害。其他少见病因尚有类癌瘤、心内膜弹力纤维增生症及右心房肿瘤等。正常三尖瓣口面积>7.0cm[sup]2[/sup],<1.5cm[sup]2[/sup]时,出现血流动力学异常,产生舒张期三尖瓣跨瓣压差,右心房压和体循环静脉压增高、淤血,同时右室排血量减少。二尖瓣狭窄的肺部表现可因伴有明显的三尖瓣狭窄而减轻。...
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