Motor vehicle collision-related accidents in pregnancy

Motor vehicle accidents (MVA) are a major contributor of worldwide morbidity and mortality; however, relatively little is known about the incidence and consequences of traffic accidents on pregnant women. Our aim is to compare rates and outcomes of motor vehicle collision-related accidents in pregnant women.

We conducted a population-based retrospective cohort study using the Healthcare Cost and Utilization Project Nationwide Inpatient Sample database from 2003 to 2011. The risk of different MVA and injuries were compared among pregnant and non-pregnant subjects using conditional logistic regression.

We identified 5936 cases of collision-related MVA in pregnancy and age-matched them at a 1:10 ratio to 59,360 non-pregnant women with collision-related MVA. As compared to non-pregnant women, pregnant women who were admitted after an MVA suffered less severe injuries and consequently required fewer therapeutic interventions and a shorter hospital stay. Pregnant women who had a collision-related MVA were, however, at increased risk of requiring genitourinary surgery (odds ratio [OR], 1.45; 95% confidence interval [CI], 1.24-1.69). When restricted to women with a fracture, pregnant women were even more likely to require genitourinary surgery (OR, 2.93; 95%CI, 2.32-3.71) as well as require a blood transfusion (OR, 1.21; 95%CI, 1.01-1.44).

Pregnant women admitted to hospital after a collision-related MVA tend to sustain less severe injuries compared to non-pregnant women. However, the influence of admissions for fetal monitoring, rather than maternal injury, could not be determined from our dataset. Pregnant women who experienced a collision-related MVA also required less surgical intervention, with the exception of genitourinary surgery, which may be indicative of more cesarean deliveries.