Study suggests surgery improves survival in subset of patients with unstable angina.
D000368:Aged; D000787:Angina Pectoris / Q000601:surgery*; D000789:Angina, Unstable / Q000188:drug therapy / Q000601:surgery*; D001026:Coronary Artery Bypass; D006801:Humans; D008297:Male; D011379:Prognosis; D011897:Random Allocation