A study of more than 10,000 patients who had major noncardiac surgeries found that those who took aspirin during the perioperative period were no less likely to die or suffer a heart attack within 30 days of their surgeries than those who took a placebo. In addition, more patients who received aspirin experienced major bleeding than those in the placebo group. "We should stop aspirin during the perioperative period, because we're only putting patients at risk without an apparent benefit," study author Dr. P.J. Devereaux said. The findings were reported at the American College of Cardiology annual meeting and published in the New England Journal of Medicine.