Fig. 4

Echocardiogram performed (3 months of age) showed an interventricular septal hypertrophy (SIVd 11.2 mm; z-score 5.1) and a significant reduction in left ventricular cavity (EDV 5 ml) with ecocardiographic signs of LV outflow tract obstruction (maximum intraventricular pressure gradient 7.9 mmHg)