The LVOT diameter was obtained from LVOT images in the long-axis view. In this case, we took measurements three times with +LVOT Diam, ×LVOT Diam, and ▪ LVOT Diam, and used the average value of these results.LVOT, left ventricular outflow tract; CO, cardiac output; SV, stroke volume; RV, right ventricle; Ao, aorta.