Keele Research Repository

Background There are limited data on the management strategies, temporal trends and clinical outcomes of patients who present with non-ST-segment-elevation myocardial infarction and have a prior history of CABG. Methods and Results We identified 287 658 patients with non-ST-segment-elevation myocardial infarction between 2010 and 2017 in the United Kingdom Myocardial Infarction National Audit Project database. Clinical and outcome data were analyzed by dividing into 2 groups by prior history of coronary artery bypass grafting (CABG): group 1, no prior CABG (n=262 362); and group 2, prior CABG (n=25 296). Patients in group 2 were older, had higher GRACE (Global Registry of Acute Coronary Events) risk scores and burden of comorbid illnesses. More patients underwent coronary angiography (69% versus 63%) and revascularization (53% versus 40%) in group 1 compared with group 2. Adjusted odds of receiving inpatient coronary angiogram (odds ratio [OR], 0.91; 95% CI, 0.88-0.95; P<0.001) and revascularization (OR, 0.73; 95% CI, 0.70-0.76; P<0.001) were lower in group 2 compared with group 1. Following multivariable logistic regression analyses, the OR of in-hospital major adverse cardiovascular events (composite of inpatient death and reinfarction; OR, 0.97; 95% CI, 0.90-1.04; P=0.44), all-cause mortality (OR, 0.96; 95% CI, 0.88-1.04; P=0.31), reinfarction (OR, 1.02; 95% CI, 0.89-1.17; P=0.78), and major bleeding (OR, 1.01; 95% CI, 0.90-1.11; P=0.98) were similar across groups. Lower adjusted risk of inpatient mortality (OR, 0.67; 95% CI, 0.46-0.98; P=0.04) but similar risk of bleeding (OR,1.07; CI, 0.79-1.44; P=0.68) and reinfarction (OR, 1.13; 95% CI, 0.81-1.57; P=0.47) were observed in group 2 patients who underwent percutaneous coronary intervention compared with those managed medically. Conclusions In this national cohort, patients with non-ST-segment-elevation myocardial infarction with prior CABG had a higher risk profile, but similar risk-adjusted in-hospital adverse outcomes compared with patients without prior CABG. Patients with prior CABG who received percutaneous coronary intervention had lower in-hospital mortality compared with those who received medical management.