Coronary revascularization after myocardial infarction can reduce risks of noncardiac surgery

Abstract

Background: Recent studies suggest that preoperative coronary revascularization overall does not improve outcomes after noncardiac surgery. It is not known whether this holds true for high-risk patients with a history of recent MI. Our objective was to determine whether preoperative revascularization improves outcomes after noncardiac surgery in patients with a recent MI.

Study design: Using the California Patient Discharge Database, we retrospectively analyzed patients with a recent MI who underwent hip surgery, cholecystectomy, bowel resection, elective abdominal aortic aneurysm repair, and lower extremity amputation from 1999 to 2004 (n = 16,478). Postoperative 30-day reinfarction and 30-day and 1-year mortality were compared for patients who underwent preoperative revascularization (percutaneous transluminal coronary angioplasty, coronary stenting, or coronary artery bypass graft) and those who were not revascularized using univariate analyses and multivariate logistic regression. Relative risks with 95% confidence intervals were estimated using bootstrapping with 1,000 repetitions.

Results: Patients with a recent MI who were revascularized before surgery had an approximately 50% decreased rate of reinfarction (5.1% versus 10.0%; p < 0.001) and 30-day (5.2% versus 11.3%; p < 0.001) and 1-year mortality (18.3% versus 35.8%; p < 0.001) compared with those who were not. Stenting within 1 month of surgery was associated with a trend toward increased reinfarction (relative risk: 1.36; 95% CI, 0.96-1.97), and coronary artery bypass graft was associated with a decreased risk (relative risk: 0.70; 95% CI, 0.55-0.95).

Conclusions: This large sample representing real world practice suggests that patients with a recent MI can benefit from preoperative revascularization. Coronary artery bypass graft can improve outcomes more than stenting, especially when surgery is necessary within 1 month of revascularization, but additional prospective studies are indicated.