Imaging considerations in tetralogy of Fallot: A comprehensive review

Table 1 Parameters assessed on pre-operative transthoracic echocardiography

Parameter
Assessment of normal atrio-ventricular and ventriculo-arterial relations
Spatial relations of the great arteries
Adequacy of the size of the VSD and the routability of the left ventricle to the aorta. Additional VSDs can also be evaluated
Function of the aortic valve
Level of obstruction in RVOT
Size of the pulmonary annulus, main pulmonary artery, and branch PAs
Coronary origin and presence of any anomalous branch crossing the RVOT
In the presence of pulmonary atresia, the adequacy of native PA size and blood supply to them (via patent ductus arteriosus / aortopulmonary collaterals)
Systolic and diastolic function of the ventricles
Aortic arch abnormalities

VSD: Ventricular septal defect; RVOT: Right ventricular outflow tract; PA: Pulmonary artery.