Truncus arteriosus

Q ) Which of the following statements about truncus  arteriosus is false?
A. Most infants do well without operations until late childhood.
B. Cyanosis is a late feature
C. Most infants present with congestive heart failure.
D. Repair requires a conduit from right ventricle to pulmonary arteries.

Answer 

In Truncus arteriosus there is a single arterial trunk arising from the ventricles, with single dysplastic valve with

semilunar leaflets and a subvalvular VSD..

Untreated, most infants  do not survive beyond 6 months. Cyanosis is usually not present early, because mixing
mainly occurs at VSD level and the arterial oxygen saturation is generally greater than  85%, but............Read on