It is relatively independent of loading condition.Especially in pseudonormal pattern it has important value in identification,particularly when pulmonary venous flow cannot be detected successfully.

• 结论:二尖瓣环e/a比率反映的是组织结构运动的变化，具有相对不依赖血流负荷的影响，在二尖瓣血流频谱假性正常化时，具有重要的鉴别价值；