Abnormalities in any part of the HEART SEPTUM resulting in abnormal communication between the left and the right chambers of the heart. The abnormal blood flow inside the heart may be caused by defects in the ATRIAL SEPTUM, the VENTRICULAR SEPTUM, or both.

Synonyms: Septal Defects, Cardiac, Heart Septal Defect, Defect, Heart Septal, Septal Defect, Cardiac, Septal Defects, Heart, Cardiac Septal Defect, Defects, Cardiac Septal, Defects, Heart Septal, Septal Defect, Heart, Heart Septal Defects, Defect, Cardiac Septal, Cardiac Septal Defects