The indicators for judging the clinical success of PBMV are as follows:

① Diastolic murmur at apex of heart disappears or is obviously weakened. Cardiac function is improved by more than one level.

② the average left atrial pressure was ≤1.5kPa(llmmHg), and the mitral valve pressure difference was ≤18mmHg(2.4kPa).

③ The cardiac output increased, and the whole lung resistance decreased.

④ The mitral valve orifice area is. ≥2cm2。

⑤ No important complications occurred. The technical success rate of PBMV is generally above 95%.