Contemporary Burden of Cardiovascular Disease in Pregnancy: Insights from a Real-World Pregnancy Electronic Health Record Cohort

Importance

Cardiovascular disease (CVD) is the leading cause of maternal morbidity and mortality, however the contemporary burden and secular trends in pregnancy-related CV complications are not well characterized.

Objective

We sought to examine contemporary trends in prevalence of maternal cardiometabolic comorbidities and established CVD, as well as future pregnancy-related CV complications across a large multi-institutional health system.

Design

Retrospective analysis of longitudinal electronic health record (EHR)-based cohort of pregnancies

Setting

Multi-institutional healthcare network in New England

Participants

Pregnancy encounters between 2001 to 2019 identified using diagnosis and procedure codes followed by manual adjudication within a previously validated primary care EHR cohort. Estimated gestational ages recovered from unstructured notes using regular expressions (RegEx) were used to define individual pregnancy episodes.

Main Outcomes and Measures

We quantified the prevalence of maternal cardiometabolic comorbidities and established CVD at time of pregnancy, as well as the incidence of pregnancy-related CV complications assessed within 1 year postpartum. We examined trends in cardiometabolic risk factors and CVD burden over nearly two decades.

Results

Our EHR pregnancy cohort comprised 57,683 pregnancies among 38,997 individuals (mean age range at start of pregnancy 27 to 37 years). RegEx recovered gestational age for 74% of pregnancies, with good correlation between gestational age ascertained via RegEx vs manual review (Pearson r 0.9). Overall prevalence of maternal CVD was 4% (age-adjusted 7%) and increased over 19 years of follow-up (age-adjusted prevalence of maternal CVD: 1% in 2001 to 7% in 2019, p <0.001). The incidence of pregnancy-related CV complications was 15% (age-adjusted 17%) and also increased over the follow-up period (age-adjusted incidence 11% in 2001 to 14% in 2019, p <0.001). Finally, CV complications were more likely to occur in individuals with greater burden of maternal CV comorbidities and CVD (diabetes: 6% vs 3%, hypertension: 23% vs 5%, pre-existing CVD: 10% vs 3%, P<0.001 for all).

Conclusions and Relevance

Analysis of a large-scale EHR-based pregnancy cohort spanning two decades demonstrates rising prevalence of both maternal cardiometabolic comorbidities and CVD at the time of pregnancy, as well as increasing incidence of subsequent pregnancy-related CV complications. Pregnancy represents a critical opportunity for cardiometabolic health optimization.

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