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1 Director of Pediatrics.
2 Assistant Resident in Pediatrics.
Two cases of cor triloculare biatriatum are reported. The first case was complicated by mitral atresia, premature closure of the foramen ovale, and aortic hypoplasia. This was a case of a functionally biloculate heart. The infant died 16 hours after birth.
The second case concerns an infant who died at seven days of age. The main malformation was complicated by defects almost similar to those of the first case, namely: mitral hypoplasia, atresia of the aortic orifice and hypoplasia of the ascending aorta.
The great vessels were transposed in both cases (type 1,A of Rogers and Edwards).
The literature on the subject has been reviewed and an embryological discussion of the abnormality noted in the two hearts follows. The embryopathogenesis of these complex malformations is thought to be due to a primary faulty partitioning of the truncus arteriosus.
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