In which of the following differential cyanosis found ?: (A) VSD with reversal of shunt, (B) PDA with reversal of shunt, (C) ASD with reversal of shunt, (D) Tetralogy of Fallot
Answer is B. In PDA the shunt is between pulmonary aery and aoa distal to subclan aery resulting in differential cyanosis. Ref : Ghai essential of pediatrics, eighth edition, p.no:417