Long QT syndrome in extensive infective endocarditis complicating hypertrophic obstructive cardiomyopathy.

Infective endocarditis in hypertrophic obstructive cardiomyopathy is uncommon. We present a case of extensive infective endocarditis in a female patient with mild hypertrophic obstructive cardiomyopathy and long QT syndrome. Upon a definite diagnosis, an urgent operation was performed successfully, and the patient had an uneventful postoperative course. The clinical features and the possible mechanisms of long QT syndrome of this patient are discussed.