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The most common form of birth defects are congenital heart defects. This article describes the causes, symptoms, and treatments of congenital heart defects. Cleft Lip and Cleft Palate. The 4th most common birth defect is a cleft lip or palate.
The atrial septal defect (ASD) is the most common congenital heart defect encountered in adults, accounting for up to 15% of all adult CHD (Fig. 1). It results from the failure of proper embryologic development of the atrial septum.