Echocardiogram of infundibular ventricular septal defect

Transthoracic echocardiogram showing an infundibular or supracristal defect with and without color flow Doppler in systole and diastole. Aortic valve prolapse is seen in early systole (A). As blood is ejected from the left ventricle (LV), the anatomically unsupported coronary cusp and aortic sinus are driven into the right ventricle (RV) by a Venturi effect. Color flow Doppler shows left-to-right shunt across the VSD (B). In diastole (C), the unsupported cusp does not coapt with the other coronary cusps, resulting in aortic regurgitation.