Ventricular septal defect Gerbode ventricular septal defect 2012-04-08T09:34:01Z Echocardiography may visualize a jet across a small defect between left ventricle and right atrium. UMLS:C0265812 A type of ventricular septal defect communicating directly between the left ventricle and right atrium. This is anatomically possible because the normal tricuspid valve is more apically displaced than the mitral valve. SNOMEDCT_US:41893002 HP:0011621 UMLS:C4023265 Left ventricular - right atrial communication