<prompt> Which one of the following congenital heart diseases has cyanosis without cardiomegaly andor congestive heart failureTransposition of great arteriesFallots tetralogyCongenital mitral regurgitaionCongenital pulmonary stenosis  <response>: Cardiomegaly and CHF do not occur in Fallots tetrology.No CardiomegalyFirst you should know the following facts : -Pressure overload to ventricles causes concentric hypertrophy without dilatation.Volume overload to ventricles causes hypertrophy with dilatation Eccentric hypertrophy.Due to pulmonary stenosis, there is pressure overload to right ventricle Concentric hypertrophy of right ventricle without dilatation No Cardiomegaly.No CHFThe VSD of TOF is always large enough to allow free exit to the right to left shunt.Since the right ventricle is effectively decompressed by the VSD, CHF never occurs in TOF. 