Mitral regurgitation

Etiology

Myxomatous degeneration (eg, mitral valve prolapse, Marfan syndrome)
Infective endocarditis
Subvalvular dysfunction (papillary muscle dysfunction or ruptured chordae tendinae)
Rheumatic heart disease
Dilated cardiomyopathy
Congenital cleft mitral valve
Left atrial myxoma (rare)

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