text: 在左襻的左心室型单心室，左侧房室瓣（三尖瓣）多为发育不良右侧房室瓣（三尖瓣）往往有明显的反流心尖或胸骨旁彩色多普勒显像可理想显示反流血流，而心尖的脉冲和连续波多普勒检测对测定房室瓣狭窄有用。
entities.entity: 左侧房室瓣
entities.label: bod
entities.entity: 三尖瓣
entities.label: bod
entities.entity: 左侧房室瓣（三尖瓣）多为发育不良
entities.label: sym
entities.entity: 右侧房室瓣
entities.label: bod
entities.entity: 三尖瓣
entities.label: bod
entities.entity: 右侧房室瓣（三尖瓣）往往有明显的反流
entities.label: sym
entities.entity: 心尖
entities.label: bod
entities.entity: 胸骨
entities.label: bod
entities.entity: 彩色多普勒显像
entities.label: pro
entities.entity: 心尖
entities.label: bod
entities.entity: 多普勒检测
entities.label: pro
entities.entity: 房室瓣狭窄
entities.label: dis