Abstract 17438: Sex Differences and Temporal Trends in Revascularization and Outcomes of ST-Elevation Myocardial Infarction in Older Adults in the United States

Abstract

Background: Prior studies have suggested that women with ST-elevation myocardial infarction (STEMI) have higher in-hospital mortality risk than younger men with STEMI. However, there is a significant STEMI risk in older patients. We analyzed temporal trends and sex differences in revascularization and other in-hospital outcomes in older STEMI patients. Methods: National Inpatient Sample databases from 2005 to 2014 were utilized to identify all STEMI patients with age greater than 60 years old. We studied the temporal trends and sex differences in revascularization therapies and in-hospital mortality. Results: There were N=192,204 older adults diagnosed with STEMI. Older women with STEMI were less likely to undergo coronary angiography (adjusted OR: 0.90; 95% CI: 0.88 to 0.93) and receive reperfusion (percutaneous coronary intervention (PCI) adjusted OR: 0.90; 95% CI: 0.87 to 0.92) compared to older men. Also, the adjusted odds ratio comparing the likelihood of receiving PCI between women and men decreased by an annual average of 0.9% (P=0.028). Older men were more likely to receive PCI on Hospital Day 0 compared to older women. There was a decreasing trend in both sexes for use of coronary artery bypass graft (CABG), though older men consistently underwent CABG more often than older women (Figure). Older women had higher in-hospital mortality than men (adjusted OR: 1.12; 95% CI: 1.08 to 1.17). However, the differences decreased with increasing patient age. There was no significant change in adjusted in-hospital mortality in both genders (all P>0.05). Conclusions: Older women were less likely to receive revascularization for STEMI than men, and this gap increased over the study period. Older women had higher in-hospital mortality compared with older men, but there was no significant temporal change for both genders. Further research is needed to identify the reasons why older women receive less revascularization.