Abstract 16253: Temporal Trends and Outcomes of Coronary Artery Bypass Grafting After Acute St-elevation Myocardial Infarction

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Introduction: There is paucity of data on the outcomes of coronary artery bypass grafting (CABG) among patients presenting with ST-segment elevation myocardial infarction (STEMI). Methods: We queried the National Inpatient Sample database (2002-2016) for patients with STEMI who underwent CABG. We reported the trends in utilization of CABG for STEMI, and the associated in-hospital outcomes. Using multivariable analysis, we compared in-hospital outcomes in patients undergoing CABG on hospitalization day 1 vs. day 2 vs. day ≥3 , in the early (2002 to 2009) and contemporary cohorts (2012 to 2016). Results: Our analysis yielded 2,910,960 patients with STEMI, of whom 7.6% underwent CABG (9.6% in 2002 versus 3.9% in 2016, P trend <0.001). There was an increase in in-hospital mortality (5.8% in 2002 versus 7.6% in 2016, P trend <0.001) which corresponded to an increase in comorbidities burden among patients undergoing CABG. There was a rising trend in performing CABG on hospitalization day ≥ 3 corresponding to an increase in the utilization of MCS and pre-CABG PCI during the study years. CABG was more likely to be performed on admission day 1 in patients with anterior STEMI, cardiogenic shock or mechanical complications. In the early cohort, CABG on day 1 and day 2 was associated with higher in-hospital mortality, while in the contemporary cohort only CABG on day 1 was associated with higher in-hospital mortality compared with CABG on day ≥ 3. CABG on day 1 was associated with higher rate of cardiac arrest, hemorrhagic stroke, blood transfusion and cardiac tamponade in the earlier cohort, while in the more contemporary cohort it was associated with higher blood transfusion. Conclusions: There was a downtrend in performing CABG for STEMI, and an uptrend in in-hospital mortality after CABG. Patients undergoing emergent CABG on day 1 were more likely to have mechanical complications and cardiogenic shock and were associated with higher in-hospital mortality.

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