Atrioventricular septal defect
Atrioventricular septal defect ( AVSD) refers to a spectrum of cardiac malformation that include abnormalities in the development of the inter aerial septum.AVSD is also referred to as atrioventricular canal defects or endocardial cushion defects. ASDV are usually divided into partial, inter mediate and complete forms. (55)
Classification of atrioventricular septal defect
AVSD are not associated with other cardiac malformation. In type AVSD, the anterior superior bridging leaflet is attached almost entirely to the left ventricular, and its commissure with the anterior tricuspid leaflet lies along the right anterior- superior rim of the ventricular.
Type B of AVSD is the rarest form of a complete defect and consists of a large anterior septal bridging leaflet over hanging the ventricular septum to greater degree than occurs in type A. (56)
AVDS is frequently associated with other congenital cardiac abnormalities such as tetralogy of fallot, double outlet right ventricular complete transposition of the great arteries and hetero taxic syndromes.(57)