Abstract
An 18-years-old adolescent with asymmetric mid-ventricular hypertrophic cardiomyopathy, undiagnosed because he did not present symptoms. The electrocardiogram indicated an increase in the QT interval, without arrhythmias; the transthoracic echocardiogram revealed asymmetric mid-ventricular hypertrophy, with mild obstruction of the left ventricular outflow tract; the mitral valve was thickened and calcified. Symptoms were not found because the outflow tract obstruction was not noticeable; as hypertrophy increased, the symptoms appeared. The thickening and calcification of the mitral valve, uncommon for the patient's age, could cause mitral regurgitation or heart failure. Key Words: Genetic hypertrophic cardiomyopathy, mild outflow tract obstruction, calcification and thickening of the mitral valve.
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