Tetralogy of Fallot

SummaryWith Value of Angiocardiography in Tetralogy of FallotInfundibular StenosisThe recognition of an organic pulmonary infundibular stenosis is important. It occurred in 76% of the cases. I t is usually at the crista, and in the sagittal plane, but tends to be in the coronal plane, and more horizontally if very low. It may be “band‐like”, but more often it appears as a “tight” constriction.In fundibular ChamberThe next most favourable group for surgery are those with a high or intermediate pulmonary infundibular stenosis and a small chamber (Group 2).The most difficult group surgically is the group with a high pulmonary infundibular stenosis and no chamber (Group 3), A larger proportion of these cases have pulmonary valve stenosis in addition to pulmonary infundibular stenosis, and many also have hypoplasia of the outflow tract from the valve ring onwards. (Sec paragraph below.)Pulmonary Valve Stenosis (36 cases in all)This occurred in about half of the cases with pulmonary infundibular stenosis, i.e., 19 cases, or and incidence of about 31%. It also occurred isolated in the groups with muscular pulmonary infundibular stenosis (Group 4) and double outlet right ventricle (Group 5