Introduction

Partial anomalous pulmonary venous return refers to anomalies in which one or more (but not all) of the pulmonary veins connects to a location other than the left atrium. This causes left to right shunting which may have hemodynamic and therefore clinical significance, warranting repair in some patients. Join CardioNerds to learn about partial anomalous pulmonary venous return! Dr. Dan Ambinder (CardioNerds co-founder), Dr. Josh Saef (ACHD FIT at the University of Pennsylvania and ACHD Series co-chair), and Dr. Tripti Gupta (ACHD FIT at Vanderbilt University and episode lead) learn from Dr. Ian Harris (Director of the Adult Congenital Heart Disease program at University of California, San Francisco). Audio editing by CardioNerds Academy Intern, student doctor Shivani Reddy. The CardioNerds Adult Congenital Heart Disease (ACHD) series provides a comprehensive curriculum to dive deep into the labyrinthine world of congenital heart disease with the aim of empowering every CardioNerd to help improve the lives of people living with congenital heart disease. This series is multi-institutional collaborative project made possible by contributions of stellar fellow leads and expert faculty from several programs, led by series co-chairs, Dr. Josh Saef, Dr. Agnes Koczo, and Dr. Dan Clark. The CardioNerds Adult Congenital Heart Disease Series is developed in collaboration with the Adult Congenital Heart Association, The CHiP Network, and Heart University. See more Disclosures: None Pearls • Notes • References • Guest Profiles • Production Team CardioNerds Adult Congenital Heart Disease PageCardioNerds Episode PageCardioNerds AcademyCardionerds Healy Honor Roll CardioNerds Journal ClubSubscribe to The Heartbeat Newsletter!Check out CardioNerds SWAG!Become a CardioNerds Patron! Pearls - Partial Anomalous Pulmonary Venous Return (PAPVR) What is partial anomalous pulmonary venous return (PAPVR)? PAPVR refers to anomalies in which one or more (but not all) of the pulmonary veins connects to a location other than the left atrium. Often, this means one or more pulmonary veins empty into the right atrium or a systemic vein such as the superior vena cava or inferior vena cava. Physiologically, this produces a left-to-right shunt, allowing for already-oxygenated blood to recirculate into the lungs and result in excessive pulmonary blood flow.  What are the clinical features of PAPVR?Diagnosis is usually incidental on a cross sectional imaging such as CTA or CMR.The most common associated lesion is an atrial-level defect.It is unusual for a single anomalous pulmonary venous connection of only 1 pulmonary lobe to result in significant shunting. Patients with a significant degree of left to right shunting may have right heart dilatation or symptoms of dyspnea on exertion. When are some strategies for managing patients with PAPVR?A surgical correction is recommended for patients with PAPVR when functional capacity is impaired and RV enlargement is present, there is a net left-to-right shunt sufficiently large to cause physiological sequelae (aka: ratio of pulmonary flow (Qp) to systemic flow (Qs) is > 1.5:1), PA systolic pressure is less than 50% systemic pressure and pulmonary venous resistance is less than one third of systemic venous resistance.Surgical repair involves intracaval baffling of the left atrium (Warden procedure) or direct reimplantation of the anomalous pulmonary vein into the left atrium.Pregnancy is well tolerated in patients with repaired PAPVR. In patients with unrepaired lesion who may have right sided heart dilatation and/or pulmonary hypertension, preconception evaluation and counseling should address how pregnancy may affect mother’s and fetus’s health. Antibiotic prophylaxis for infective endocarditis is typically not needed unless patients are less than 6 months from recent surgery, have residual defect at the patch margin or prior history of infective endocarditi...