Fetal Growth Outcomes in a Cohort of Polydrug- and Opioid-Dependent Patients.

OBJECTIVES

To evaluate the effects of prenatal polydrug and exclusive opioid use on fetal growth outcomes.

METHODS

This analysis relied on the data obtained from two prospective cohorts at the University of New Mexico. For both cohorts, pregnant women were recruited during one of their prenatal care visits and followed up to delivery. The merged sample included 59 polydrug users, 22 exclusive opioid users, and 278 abstinent controls. Continuous growth measures (birth weight, height, occipital frontal circumference [OFC], and corresponding sex-specific percentiles) were compared by ANOVA and ANCOVA in bivariate and multivariable analyses, respectively. Categorical outcomes (prevalence of small-for-gestational age [SGA] for weight, length, and OFC) were compared among groups by Chi-square and multivariable logistic regression analyses..

RESULTS

The sample included a large proportion of ethnic minorities (78.8% Hispanic) and patients with low educational attainment (68% ≤ high school). The risk of microcephaly (OFC<10 percentile) was significantly greater in the polydrug (OR=4.7; 95% CI: 2.0; 10.8) and exclusive opioid (OR=2.8; 95% CI: 1.0; 8.1) groups compared to abstinent controls.

CONCLUSION

Given that microcephaly is often associated with serious neurocognitive and behavioral deficits later in life, our finding of 49.2% incidence of microcephaly among polydrug users is alarming and requires further investigation.