Acute mitral regurgitation due to ruptured chordae tendineae in a patient with hypertrophic obstructive cardiomyopathy: a case report.

Hypertrophic cardiomyopathy(HCM)is a genetic disease, characterized by hypertrophy of the left ventricle, with markedly variable clinical manifestations and morphological and hemodynamic abnormalities. The clinical course is relatively benign for the majority of patients, although disease-related complications can develop. However, the site and extent of cardiac hypertrophy and systolic anterior motion of the mitral valve leaflets which contact with the ventricular septum result in obstruction to left ventricular outflow tract (LVOT) in a subset of patients. The presence of LVOT stenosis is an independent predictor of poor prognosis in patients with HCM. Ruptured chordae tendineae represents a rare cause of mitral regurgitation in hypertrophic obstructive cardiomyopathy (HOCM). We describe a case of acute deterioration of mitral regurgitation due to ruptured chordae tendineae identified preoperatively by trans-