Meta-Analysis of Sex Disparities in In-hospital Care and Outcomes in Patients with ST-Segment Elevation Myocardial Infarction.

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Sex disparities in ST-segment elevation myocardial infarction (STEMI) outcomes continue to be reported worldwide; however, the magnitude of this gap remains unknown. To evaluate gender-based discrepancies in clinical outcomes and identify the primary driving factors a global meta-analysis was performed. Studies were selected if they included all comers with STEMI, reported sex specific patient characteristics, treatments, and outcomes, according to the registered PROSPERO protocol: CRD42020161469. A total of 56 studies (705,098 patients, 31% females) were included. Females were older, had more comorbidities and received less antiplatelet therapy and primary percutaneous coronary intervention (PCI). Females experienced significantly longer delays to first medical contact (mean 42.5 min) and door-to-balloon time (mean 4.9 min). In-hospital, females had increased rates of mortality (odds ratio [OR] 1.91, 95% confidence interval [CI] 1.84-1.99, p<0.00001), repeat myocardial infarction (MI) (OR 1.25, 95% CI 1.00-1.56, p=0.05), stroke (OR 1.67, 95% CI 1.27-2.20, p<0.001), and major bleeding (OR 1.82, 95% CI 1.56-2.12, p<0.00001) compared to males. Older age at presentation was the primary driver of excess mortality in females, although other factors including lower rates of primary PCI and aspirin usage, and longer door-to-balloon times contributed. In contrast, excess rates of repeat MI and stroke in females appeared to be driven, at least in part, by lower use of primary PCI and P2Y12 inhibitors, respectively. In conclusion, despite improvements in STEMI care, women continue to have in-hospital rates of mortality, repeat MI, stroke, and major bleeding up to 2-fold higher than men. Sex disparities in in-hospital outcomes can largely be explained by age differences at presentation but comorbidities, delays to care and suboptimal treatment experienced by women may contribute to the sex gap.

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Authors: Tayyab Shah, Ido Haimi, Yiping Yang, Samantha Gaston, Roy Taoutel, Sameer Mehta, Hyon Jae Lee, Robaayah Zambahari, Andreas Baumbach, Timothy D Henry, Cindy L Grines, Alexandra Lansky, Daniela Tirziu