Before commissurotomy

After commissurotomy

P value

Mean

SD

Mean

SD

Mean diastolic

Pressure Gradient

9.6

2.3

6.4

1.5

<0.001

across MV (mmHg)

RVSP (mmHg)

35.3

3.2

23.8

3.3

<0.001

LA pressure Mean (mmHg)

12.7

2.6

6.3

1.8

<0.001

LV pressure Mean (mmHg)

105.5

10.6

128.0

7.1

<0.001