Mixed Heart Defects

Strictly, a mixed congenital heart defect contains two or more structural lesions, such as an atrial septal defect with a ventricular septal defect or a patent ductus arteriosus with coarctation. The combination can create left-to-right shunting, volume overload of one or both ventricles, and progressive pulmonary vascular disease. The lesion-specific patterns are included because they teach the same bedside reasoning used in complex mixed defects: identify whether blood cannot mix, systemic or pulmonary flow depends on the ductus, pulmonary flow is excessive, or pulmonary venous return is obstructed. The immediate nursing priority is determined by that circulation problem—not by the murmur or diagnostic label alone.