Association of severe maternal morbidity and post-traumatic stress disorder.

BACKGROUND: Severe maternal morbidity refers to the most serious complications of pregnancy. Whether severe maternal morbidity is associated with post-traumatic stress disorder is currently under active investigation. OBJECTIVE: This study aimed to examine the association between severe maternal morbidity and post-traumatic stress disorder at delivery. STUDY DESIGN: This was a retrospective cohort study querying the Healthcare Cost and Utilization Project's National Inpatient Sample, which included 12,857,721 patients for national estimates who had vaginal or cesarean deliveries between January 2016 and December 2019. Patients with mental health conditions other than post-traumatic stress disorder and substance use disorder were excluded. Severe maternal morbidity was defined according to the Centers for Disease Control and Prevention definition (a total of 21 indicators). Main outcomes were trends and characteristics related to post-traumatic stress disorder, assessed with a multivariable binary logistic regression model. Sensitivity analysis included subcohort assessment restricted to patients per clinical and obstetrical demographics. RESULTS: A total of 8880 patients had a diagnosis of post-traumatic stress disorder during the hospital admission for delivery (prevalence rate, 6.9 per 10,000). The prevalence rate of post-traumatic stress disorder increased from 5.0 to 8.8 per 10,000 deliveries between 2016 and 2019. This increasing trend remained independent in multivariable analysis. The adjusted odds ratio, compared with 2016, was 1.26 (95% confidence interval, 1.19-1.35) for 2017, 1.50 (95% confidence interval, 1.41-1.60) for 2018, and 1.73 (95% confidence interval, 1.63-1.84) for 2019. Severe maternal morbidity occurred in 210,605 (1.6%) patients. Patients who had severe maternal morbidity were more likely to have a diagnosis of post-traumatic stress disorder than those without severe maternal morbidity (12.8 vs 6.8 per 10,000 deliveries; adjusted odds ratio, 1.57; 95% confidence interval, 1.39-1.78) in multivariable analysis. This association remained robust in several subcohort analyses including (1) participants aged ≤35 years (adjusted odds ratio, 1.62; 95% confidence interval, 1.41-1.86), (2) those aged ≤35 years without medical comorbidity (adjusted odds ratio, 2.01; 95% confidence interval, 1.70-2.37), and (3) those aged <35 years without medical comorbidity, cesarean delivery, and preterm delivery (adjusted odds ratio, 4.52; 95% confidence interval, 3.56-5.74). CONCLUSION: There has been a gradual increase in the number of patients with a diagnosis of post-traumatic stress disorder at delivery in recent years among those without other mental health or substance use conditions. These data suggest that there is a possible association between severe maternal morbidity and post-traumatic stress disorder.