text: 在非常大型的室间隔缺损时，左向右分流量取决于肺血管的阻力，由于右心室是在收缩期接受来自左心室的分流，此时右心室腔已较小，分流血流直接进入肺动脉，右心室只起到管道的作用，因此，室间隔缺损并不导致右心室容量负荷的增加，而左心室却在舒张期接纳额外的血流而出现容量负荷过重。
entities.entity: 室间隔缺损
entities.label: dis
entities.entity: 肺血管
entities.label: bod
entities.entity: 右心室
entities.label: bod
entities.entity: 左心室
entities.label: bod
entities.entity: 右心室腔
entities.label: bod
entities.entity: 血流
entities.label: bod
entities.entity: 肺动脉
entities.label: bod
entities.entity: 右心室
entities.label: bod
entities.entity: 管道
entities.label: bod
entities.entity: 室间隔缺损
entities.label: dis
entities.entity: 右心室
entities.label: bod
entities.entity: 左心室
entities.label: bod
entities.entity: 血流
entities.label: bod