Patient selection: age <= 20 years of age
Pathologic mitral regurgitation – all of the following:
(1)
mitral valve regurgitation seen in 2 views
(2) regurgitant jet length >= 2 cm in any view
(3) regurgitant jet velocity >= 3 m/s for one complete envelope
(4) pansystolic regurgitant jet seen in at least one envelope
Pathologic mitral stenosis:
(1) stenosis AND mean gradient >= 4 mm Hg
Morphologic features of mitral valve – total number present:
(1) thickening of anterior leaflet >= 3 mm
(2) thickening of chordae
(3) restriction in leaflet motion
(4) excessive leaflet tip motion during systole
