Echocardiogram in Tetralogy of Fallot

Parasternal long axis view showing colour flow from right ventricle to aorta through the ventricular septal defect with overriding aorta. Flow is predominantly blue in colour because it is away from the transducer kept at the parasternal region. Right ventricle is an anterior structure and aortic root is relatively posterior to it, and hence the anteroposterior flow depicted in blue colour.