Most common cause of heart block in infants is?

Ans. is 'b' i.e., Surgery for congenital heart disease o In children, the most common cause of permanent acquired complete AV block is surgery for congenital heart disease. Postsurgical complete atrioventricular block (AVB) is the msot common cause for acqired AV block in children, resulting from trauma to the AV node at the time of surgery (i.e., hemorrhage, ischemia, necrosis, inflammation, traumatic disruption).o The second most common cause is congenital heart disease associated with complete AV block. Other etiologies of acquired AV block are often reversible and include digitalis and other drug intoxications, viral myocarditis, acute rheumatic fever, lyme disease, and infectious mononucleosis.