20
Table 14. Stages of MS
Stage Definition Valve Anatomy
A At risk of MS • Mild valve doming during diastole
B Progressive MS • Rheumatic valve changes with
commissural fusion and diastolic
doming of the MV leaflets
• Planimetered MVA >1.5 cm
2
C Asymptomatic severe MS • Rheumatic valve changes with
commissural fusion and diastolic
doming of the MV leaflets
• Planimetered MVA ≤1.5 cm
2
• (MVA ≤1.0 cm
2
with very severe
MS)
D Symptomatic severe MS • Rheumatic valve changes with
commissural fusion and diastolic
doming of the MV leaflets
• Planimetered MVA ≤1.5 cm
2
Mitral Stenosis
