Increased prevalence of major congenital anomalies in births with placental abruption.

OBJECTIVE

To examine the association between major congenital anomalies and placental abruption.

METHODS

A register-based retrospective case-control study was carried out from 1987 to 2005. Data on baseline characteristics and birth outcomes were collected from three Finnish national health registers: the Medical Birth Register, National Hospital Discharge Register, and Register of Congenital Malformations. The study population consisted of 4,190 women with singleton birth and placental abruption. Three control women without placental abruption were selected for each case, matched by maternal age, parity, year of birth, and hospital district. The main outcome measure of the study was a major congenital anomaly associated with placental abruption.

RESULTS

In total, 261 (prevalence 623/10,000) births with placental abruption and 415 (prevalence 330/10,000) control births had major congenital anomalies (odds ratio [OR] 1.92, 95% confidence interval [CI] 1.6-2.52). The association was strongest among births with growth restriction and prematurity. Adjusted analysis revealed a significant association with central nervous system anomalies (OR 2.33, 95% CI 1.29-4.23), anomalies of the eyes and ears (OR 1.82, 95% CI 1.08-3.09), cardiovascular anomalies (OR 1.78, 95% CI 1.34-2.37), respiratory anomalies (OR 3.51, 95% CI 1.56-7.90), gastrointestinal anomalies (OR 3.81, 95% CI 2.27-6.41), genitourinary anomalies (OR 2.55, 95% CI 1.73- 3.74), musculoskeletal anomalies (OR 1.67, 95% CI 1.24-2.24), and anomalies of integument (OR 3.29, 95% CI 1.20-8.98) in births complicated by placental abruption.

CONCLUSIONS

Major congenital anomalies are twice as common among neonates born from pregnancies complicated by placental abruption compared with control pregnancies without abruption. This observation applies to several organ systems.

LEVEL OF EVIDENCE

II.