Table 2. Classification of primary mitral valve diseases.

Classification	No. of cases (%)#
Mechanism of MR (n=76)
Type I (normal leaflet motion)	65 (85.5)
Annular dilatation	18 (23.7)
Cleft leaflet	39 (51.3)
Leaflet defect	31 (40.8)
Type II (leaflet prolapse)	32 (42.1)
Ruptured chordae	7 (9.2)
Elongated chordae	19 (25.0)
Absent chordae	6 (7.9)
Type III (restricted leaflet motion)	9 (11.8)
Short chordae	7 (9.2)
Papillary muscle fusion	2 (2.6)
Mechanism of MS (n=22)
Type A (normal papillary muscle)	20 (90.9)
Supravalvular ring	16 (72.7)
Junctional fusion of papillary muscles	2 (9.1)
Leaflet fusion	2 (9.1)
Type B (abnormal papillary muscle)	2 (9.1)
Parachute valve	2 (9.1)

^#, patients can have mixed mitral valve pathologies. MR, mitral valve regurgitation; MS, mitral valve stenosis.