The term<unk>  refers to a collection of abnormalities in the heart's structure that are present at birth. An<unk>  may be interchangeably called an endocardial cushion<unk>  or atrioventricular septal<unk> . Regardless of name, this<unk>  refers to the formation of a hole between the upper chambers of the heart (called atria). It also refers to problems involving the valves that work to maintain blood flow in the heart. Often, these valves overcircualte blood to the lungs causing the heart to be overworked and may even result in tissue enlargement of the heart muscle.
Atrioventricular canal defect
Atrioventricular septal defect
Ventricular septal defect
Accessory auricle
Atrial septal defect
Endocardial cushion defect
Persistent truncus arteriosus
Deviated septum