Atrioventricular septal defect (atrioventricular canal or endocardial cushion defect): the effect of a shunt at the ventricular side will result in different hemodynamic effect than at an atrial side. Understanding the types of ventricular septal defects are simplified as well as full understanding of the atrioventricular canal defect is made simple with the aid of real echo and cardiac MRI videos and images. Enjoy your journey and start learning.