<prompt> Commonest cause of hea failure in infancy is -MyocarditisRheumatic feverCardiomyopathyCongenital hea disease  <response>: Ans. is d i.e., Congenital hea disease Congestive hea failure o Congestive hea failure is state in which the hea cannot produce the cardiac out required to sustain the metabolic needs of the body, without evoking ceain compensatory mechanism. o The most common cause of CHF in infants -- Congenital hea disease. o The most common cause of CHF in the older children -- Rheumatic fever rheumatic hea disease. 