This document discusses several types of cardiac dysfunction including atrial and ventricular septal defects, patent ductus arteriosus, atrioventricular septal defect, coarctation of the aorta, aortic stenosis, pulmonary stenosis, tetralogy of Fallot, tricuspid atresia, transposition of the great arteries, total anomalous pulmonary venous return, and truncus arteriosus. For each condition, it describes the pathophysiology, clinical manifestations, diagnostic evaluations, and management/treatment approaches.