Intervention: 1) Medical therapy. This is the current, conservative practice. Each local investigator will decide the best medical treatment consistent with that given to any patient scheduled for elective vascular surgery. In patients with coronary artery disease, long-term treatment would be expected to include a combination of antiplatelet agents, beta-blockers, calcium channel blockers, and nitrates. Vascular surgery should occur as soon as possible but no later than three months after randomization. 2) Coronary artery revascularization. Repair of the heart in patients with coronary artery disease may aid in the protection of these patients when they undergo vascular surgery. The surgeon is free to choose between coronary artery bypass grafting (CABG) and percutaneous transluminal coronary angioplasty (PTCA). Coronary artery revascularization should occur as soon as possible after randomization. Vascular surgery should occur between one and three months following CABG or between three to four days and three months following PTCA.