The influence of trisomy 21 on the incidence and severity of congenital heart defects in patients with duodenal atresia.

Duodenal atresia is associated with a wide variety of congenital malformations. Trisomy 21 occurs in approximately one-thirds of infants with duodenal atresia. Congenital heart disease in patients with trisomy 21 and duodenal atresia is well known. However, the frequency and spectrum of congenital heart defects in infants with duodenal atresia and a normal karyotype has not been outlined in the literature. Therefore, we conducted a retrospective chart review to clarify our knowledge about this population. Retrospective review of the medical record was performed on patients with duodenal atresia/stenosis from January 1995 to September 2007. Demographic data included birth weight and gestational age. Variables of interest included cardiac defects and karyotype. Surgical repair for duodenal and cardiac malformations were reviewed. Ninety-four patients with duodenal atresia/stenosis were identified. Average gestational age was 36 weeks and birth weight was 2,536 g. Trisomy 21 was identified in 39 (41%) patients. Overall, 37 patients (39.3%) had a congenital heart defect. Defects were identified in 24 (61.5%) patients with trisomy 21, when compared to 13 (23.6%) patients with a normal karyotype. Of the patients with congenital heart defects and trisomy 21, 11 (28.2%) required operative repair compared to the 6 (10.9%) patients with a defect and normal karyotype. Therefore, in patients with duodenal atresia, the presence of trisomy 21 carries a relative risk of 2.61 for congenital heart defects, and relative risk of 2.59 for open heart surgery. In patients with duodenal atresia, the presence of trisomy 21 carries a 2.5-fold increased risk of cardiac defect and the same increased risk for repairing a cardiac defect.