An AVSD is a congenial heart defect in which part of the wall or septum between the two upper chambers (atria) and the two lower chambers (ventricles) of the heart has holes or defects (ASD and VSD, respectively). In addition, the heart valves separating the atria from the ventricles are defective. Instead of having two valves, the mitral and the tricuspid valves, there is one common atrioventricular valve...read more. jmarkmoralesmd.com/cardiothoracic-procedures/atrioventricual-septal-defect.html Like us on Facebook www.facebook.com/ccheartplace or visit our website www.ccheartplace.com