ventricular septal defect subarterial ventricular septal defect VSD, Type 1 abnormal communications between the two lower chambers of the heart, located beneath the pulmonic valve, communicating with the RV outflow tract above the supraventricular crest, and are associated with aortic regurgitation secondary to the prolapse of the right aortic cusp supracristal ventricular septal defect MP:0010417 conal septal ventricular septal defect MPheno.ontology subarterial doubly committed ventricular septal defect infundibular ventricular septal defect Fyler:1330 conus ventricular septal defect csmith 2010-09-27T04:09:31Z subpulmonic ventricular septal defect outlet ventricular septal defect conal septal defect