The Burden of Indirect Causes of Maternal Morbidity and Mortality in the Processof Obstetric Transition: A Cross-Sectional Multicenter Study

Abstract Objective The aim of this study is to evaluate the burden of indirect causes of maternal morbidity/mortality in Brazil. Methods Secondary analysis of a multicenter cross-sectional study conducted in 27 referral obstetric units within the Brazilian Network for Surveillance of Severe Maternal Morbidity. Results A total of 82,388 women were surveilled: 9,555 women with severe maternal morbidity were included, and 942 (9.9%) of them had indirect causes of morbidity/ mortality. There was an increased risk of higher severity among the indirect causes group, which presented 7.56 times increased risk of maternal death (prevalence ratio [PR]: 7.56; 95% confidence interval [95%CI]: 4.99-11.45). The main indirect causes of maternal death were H1N1 influenza, sepsis, cancer and cardiovascular disease. Non-public antenatal care (PR: 2.52; 95%CI: 1.70-3.74), diabetes (PR: 1.90; 95%CI: 1.24-2.90), neoplasia (PR: 1.98; 95%CI: 1.25-3.14), kidney diseases (PR: 1.99; 95%CI: 1.14-3.49), sickle cell anemia (PR: 2.50; 95%CI: 1.16-5.41) and drug addiction (PR: 1.98; 95%CI: 1.03-3.80) were independentlyassociatedwithworseresultsintheindirectcausesgroup.Someprocedures for the management of severity were more common for the indirect causes group. Conclusion Indirect causes were present in less than 10% of the overall cases, but they represented over 40% of maternal deaths in the current study. Indirect causes of maternal morbidity/mortality were also responsible for an increased risk of higher severity, and they were associated with worse maternal and perinatal outcomes. In middle-income countries there is a mix of indirect causes of maternal morbidity/ mortality that points to some advances in the scale of obstetric transition, but also reveals the fragility of health systems.