When Some Pulmonary Veins Return to the Wrong Side of the Heart Introduction Congenital cardiac defects can often be understood by asking: Where is the blood returning from? Where is it actually draining? And how much extra blood is being sent back through the lungs? Partial Anomalous Pulmonary Venous Return — PAPVR — is usually … Continue reading Partial Anomalous Pulmonary Venous Return