Purpose: Severe maternal morbidity (SMM) may be associated with postpartum psychiatric morbidity. However, the direction and strength of this relationship remains unclear. Our goal was to estimate the association between SMM and postpartum inpatient mental health care utilization. Methods: We examined all liveborn deliveries at a large, safety-net hospital in Atlanta, Georgia, from 2013 to 2021. SMM at or within 42 days of delivery was identified using International Classification of Disease (ICD) codes. The primary outcome of interest was hospitalization with a psychiatric diagnosis in the year following delivery. We used inverse probability of treatment weighting based on propensity scores to adjust for demographics, index delivery characteristics, and medical, psychiatric, and obstetric history. We fit log binomial models with generalized estimating equations to calculate adjusted risk ratios (aRRs) and 95% confidence intervals (CIs). Results: Among 22,233 deliveries, the rates of SMM and postpartum hospitalization with a psychiatric diagnosis, respectively, were 6.8% (n = 1,149) and 0.8% (n = 169). The most common psychiatric diagnosis was non-psychotic mood disorders (without SMM 0.4%, n = 79; with SMM 1.7% n = 24). After weighting, 2.2% of deliveries with SMM had a postpartum readmission with a psychiatric diagnosis, compared to 0.7% of deliveries without SMM [aRR 3.2, 95% CI (2.0, 5.2)]. Associations were stronger among individuals without previous psychiatric hospitalization. Conclusion: Experiencing SMM was associated with elevated risk of postpartum psychiatric morbidity. These findings support screening and treatment for mild and moderate postpartum psychiatric disorders in the antenatal period.
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