Delivery-associated sepsis: trends in prevalence and mortality

Abstract

Background: Sepsis is a leading cause of pregnancy-related mortality. Previous studies have reported an increased prevalence of sepsis during pregnancy. Despite national campaigns to increase sepsis awareness, there is a lack of pregnancy-specific guidelines.

Objective: We aimed to provide updated national estimates of the prevalence and trends of sepsis, sepsis-related in-hospital mortality, and factors associated with in-hospital mortality among women with sepsis at delivery.

Study design: We conducted a serial, cross-sectional analysis using data from the 2002-2015 National Inpatient Sample, the largest publicly available all-payer inpatient database in the United States. We used International Classification of Diseases, ninth edition, Clinical Modification diagnosis and procedure codes to identify the study sample of delivery-associated hospitalizations and to capture diagnoses of sepsis (defined as infection with associated end-organ dysfunction). The primary outcome was in-hospital mortality. Obstetric comorbidities and pregnancy-related outcomes were also analyzed. Logistic regression was used to explore factors associated with sepsis during pregnancy and, among those with sepsis, to identify predictors of in-hospital mortality. Joinpoint regression was used to estimate the temporal trends in both sepsis and in-hospital mortality.

Results: Of the more than 55 million delivery-associated hospitalizations, 13,129 women met criteria for sepsis, corresponding to a rate of 2.4 per 10,000 deliveries. This rate increased from 1.2 to 3.7 per 10,000 over the study period, representing an annual increase of 6.6% (95% confidence interval, 4.2-9.1). The highest crude rates of sepsis (per 10,000) were among deliveries paid for by Medicare (14.8), deliveries to women aged 40 years or older (8.0), and deliveries to non-Hispanic black women (4.6). Compared with women without sepsis, women with sepsis had a greater than 10-fold increased prevalence of most selected obstetric comorbidities. One in 11 women with sepsis died prior to discharge, compared with 1 death in every 15,411 deliveries without sepsis. The sepsis-related mortality rate decreased 21.8% each year from 2010 through 2015. Maternal age greater than 40 years and nonprivate insurance demonstrated the highest odds of sepsis-related in-hospital mortality.

Conclusion: While rates of delivery-associated sepsis have increased, case fatality has decreased.

Keywords: National Inpatient Sample; childbirth; in-hospital mortality; infection; maternal death; maternal morbidity; maternal mortality; pregnancy.