ENDOCARDIAL CUSHION DEFECTS COMMON ATRIO-VENTRICULAR CANAL AND OSTIUM PRIMUM

Abstract
The use of the term "endocardial cushion defects" is proposed to describe the group of cardiac malformations that have in common defective development of the dorsal and ventral atrio-ventricular (A-V) endocardial cushions. They can be divided into three grades: Grade I - persistent ostium premium; Grade II - intermediate forms; and Grade III - persistent common A-V canal. Two illustrative cases are described and recent reports and their bearing on clinical diagnosis are discussed.