Heart Defects Causing Extra Blood Flow Through the Lungs Heart defects that cause extra blood flow through the lungs require clinical care by a physician or other healthcare professional. Listed in the directory below are some of these defects, for which we have provided a brief overview.
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	Patent Ductus Arteriosus (PDA) Atrial Septal Defect (ASD) Ventricular Septal Defect (VSD) Atrioventricular Canal (AV Canal or AVC) Return to the Cardiovascular Disorders Home Page Return to the Disorders, Diseases and Organ Topics Home Page