This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Drug used in congenital hea disease to keep PDA patent 
Select and explain. 
A. PGEi, B. PGE2, C. PGI2, D. Indomethacin
A: PGEi
Answer: A: PGEi 
Explanation: Ans. is 'a' i.e., PGE, Prostaglandin El (PGE1) infusion usually effective in keeping the ductus aeriosus open before surgical intervention to reduce hypoxemia and acidemia before surgery in ductus dependent lesion like. Pulmonary atresia TOF with severe PS TOF with pulmonary atresia Transposition of great aeries with VSD and PS Indomethacin is used for ductal closure