Outcomes in Women Undergoing Coronary Artery Bypass Grafting: Analysis of New Data and Operative Trends

Abstract

In 2019, coronary artery bypass grafting (CABG) made up more than one-half of all adult cardiac surgical procedures in the United States, with an estimated 301,077 procedures performed, of which 161,816 were isolated CABG, and approximately 25% of which were performed in women. Women undergoing CABG are statistically more likely to present for surgery at an older age, with a greater burden of comorbidities such as diabetes and hypertension, and in decompensated clinical states (eg, acute myocardial infarction or cardiogenic shock) versus their male counterparts. However, sex has been shown to be an independent risk factor for worse outcomes even when controlling for these differences.

Although evidence has long suggested that women seem to be at significantly increased risk of adverse perioperative outcomes and worse long-term outcomes, overall trends for patients undergoing CABG in the United States (US) have improved over the last decades. Despite this, the recent evidence from Gaudino et al⁵ suggests that the outcomes gap between men and women has not improved. In their cohort study examining 1,297,204 patients undergoing isolated CABG from 2011 to 2020 in the US, women had a higher unadjusted risk of operative (30-day) morbidity and mortality, with no signs of improvement in this gap over the study period, suggesting that a greater understanding of and attention to sex-based outcomes in CABG operations are warranted. A thorough understanding of this discrepancy and the possible contributing factors is essential to improving outcomes for women undergoing CABG.