Table 1.

Structural and functional abnormalities encountered in repaired TOF

Structural Abnormalities	Functional Abnormalities
Inherent to TOF repair	RV volume overload
Partial or complete removal of pulmonary valve tissue	Pulmonary regurgitation
Infundibulotomy scar	Tricuspid regurgitation
Resection of RV/infundibular muscle bundles	Left-to-right shunt
Right atriotomy scar	Ventricular septal defect
VSD patch	Atrial septal defect
Residual or recurrent lesions	Aorto-pulmonary collaterals
RV outflow tract obstruction	RV pressure overload
Main or branch pulmonary artery stenosis	RV outflow or pulmonary artery stenosis
Ventricular septal defect	Pulmonary vascular disease
Atrial septal defect	Pulmonary venous hypertension secondary to LV dysfunction
Acquired lesions	RV systolic dysfunction
Tricuspid valve abnormalities	RV diastolic dysfunction
RV outflow tract aneurysm	LV dysfunction
RV fibrosis	Ventricular conduction delay
Associated anomalies	Arrhythmias
Dilated aorta	Atrial flutter
Associated congenital cardiovascular anomalies	Atrial fibrillation
Associated genetic and non-cardiac anomalies	Ventricular tachycardia
	Co-morbidities
	Renal, pulmonary, musculoskeletal, neurodevelopmental abnormalities