A nurse is caring for an infant who has a congenital heart defect. Which of the following defects is associated with increased pulmonary blood flow?

Rationale: A. Coarctation of the aorta is a narrowing of the aorta, leading to obstructed blood flow, not increased pulmonary blood flow. B. Patent ductus arteriosus (PDA) allows blood to flow from the aorta back into the pulmonary artery, increasing pulmonary blood flow. C. Tetralogy of Fallot is a cyanotic defect that decreases pulmonary blood flow due to right ventricular outflow obstruction. D. Tricuspid atresia involves absence of the tricuspid valve, leading to decreased pulmonary blood flow.