二尖瓣返流时可用心导管在肺动脉记录到舒张早期压力波(V 波)。Spring 和 Row 发现增大的舒张早期压力波超过肺动脉收缩压。此外,他们间接发现,肺动脉舒张早期压力波可致使肺动脉瓣提早关闭。然而,舒张早期压力波与肺动脉瓣关闭之间 Mitral regurgitation can be catheterized in the pulmonary artery early diastolic pressure wave (V wave). Spring and Row found that an increased diastolic pressure wave exceeded pulmonary artery systolic pressure. In addition, they indirectly found that early diastolic pulmonary artery pressure wave can cause the pulmonary valve to close early. However, between the early diastolic pressure wave and the pulmonary valve closure