Ostium primum is a defect of the atrioventricular canal with cleft mitral valve constituting approximately 25% of all atrial septal defects.1 The tricuspid valve is either not cleft or it shows minor deficiency. Ostium primum defects are classified into type A, B, or C defects, which describe the various forms of anterior valve defects.
- Left access deviation.
1. Alexander RW, Schlant RC, eds: Hursts The Heart, 8th ed. New York: McGraw-Hill, 1994.Alexander RW, Schlant RC, eds: Hursts The Heart, 8th ed. New York: McGraw-Hill, 1994.
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