Source:http://linkedlifedata.com/resource/umls/id/C0018818
MSH: Developmental abnormalities in any portion of the VENTRICULAR SEPTUM resulting in abnormal communications between the two lower chambers of the heart. Classification of ventricular septal defects is based on location of the communication, such as perimembranous, inlet, outlet (infundibular), central muscular, marginal muscular, or apical muscular defect.,NCI: The presence of a defect (opening) in the septum that separates the two ventricles of the heart. The VSD can be congenital or acquired.