Does Timing of Coronary Artery Bypass Grafting after ST-Elevation Myocardial Infarction Impact Early- and Long-Term Outcomes?

Abstract

Background:  The optimal timing of surgical revascularization after ST-elevation myocardial infarction (STEMI) is controversial, with some suggesting higher mortality rates in patients undergoing early surgery. The aim of the study is to determine the effect of the timing of surgical revascularization on 30-day mortality and long-term outcomes in these patients.

Methods:  Retrospective single-center analysis of patients with STEMI undergoing coronary artery bypass grafting (CABG) between January 2008 and December 2019 at our institution. The cohort was split into three groups based on time from symptom onset until surgical revascularization (Group 1: <12 hours, Group 2: 12-72 hours, Group 3: >72 hours). Statistical analyses were performed with and without patients in cardiogenic shock. Primary outcomes were 30-day mortality and 10-year survival.

Results:  During the study period, 437 consecutive patients underwent surgical revascularization in the setting of STEMI. The mean age was 67.0 years, 96 (22.0%) patients were female, and 281 (64.3%) patients underwent off-pump CABG. The overall 30-day mortality including patients with cardiogenic shock was 12.8%. The 30-day mortality was 16.1, 13.9, and 9.3% in Groups 1, 2, and 3 (p = 0.31), whereas 10-year survival was 48.5, 57.3, and 54.9% (log-rank: p = 0.40). After exclusion of patients in cardiogenic shock, there was no difference between the three groups in 30-day and 10-year mortality. Timing of surgery had no influence on early- and long-term survival.

Conclusion:  In patients with STEMI, early surgical revascularization achieved similar early- and long-term survival rates compared with a delayed surgical revascularization strategy. Hence, when indicated, an early CABG strategy has no disadvantages in comparison to a delayed strategy.