Total Anomalous Pulmonary Venous Return (TAPVR)

Total Anomalous Pulmonary Venous Return (TAPVR) is a rare heart defect present at birth where the veins that carry oxygen-rich blood from the lungs do not connect normally to the heart. Instead of flowing into the left side of the heart, this blood returns to the right side or other abnormal locations, causing mixing of oxygen-rich and oxygen-poor blood. This affects the circulatory system and leads to reduced oxygen delivery to the body, resulting in symptoms like cyanosis (bluish skin), difficulty breathing, and poor feeding in infants. The heart has to work harder to pump blood, which can cause heart failure if untreated. Early diagnosis and treatment are critical to improve oxygenation and overall health. This condition requires specialized care from heart specialists.

Total Anomalous Pulmonary Venous Return (TAPVR) is a congenital cardiac malformation characterized by the failure of all four pulmonary veins to connect normally to the left atrium. Instead, pulmonary venous blood drains anomalously into the systemic venous circulation, commonly via the superior vena cava, coronary sinus, or inferior vena cava. This results in complete mixing of oxygenated and deoxygenated blood in the right atrium, causing systemic hypoxemia and volume overload of the right heart. The condition is classified into supracardiac, cardiac, infracardiac, and mixed types based on the site of anomalous drainage. TAPVR is often associated with an obligatory atrial septal defect or patent foramen ovale, which allows left heart filling. Without surgical correction, TAPVR leads to progressive pulmonary hypertension, right heart failure, and death in infancy. It is a critical diagnosis in neonates presenting with cyanosis and respiratory distress.