Hypertrophic cardiomyopathy (HCM) is a diffuse or segmental left ventricular hypertrophy in the absence of systemic or cardiac disease. Asymmetric involvement of the interventricular septum is the most common HCM. The criteria for diagnosing is septal thickness greater than or equal to 15 mm (normal wall thickness is 12 mm or less, measured during diastole) or ratio of septal thickness to the thickness of the left ventricular inferior wall at the mid-ventricular level is greater than 1.5.