Comparison of Long-term Efficacy of Medical Treatment versus Coronary Artery Bypass Grafting (CABG) in Multivessel Coronary Artery Disease

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The longterm results of medical therapy and coronary artery bypass grafting (CABG) were compared in patients with multivessel disease. All patients were confirmed to have≥75% luminal narrowing of major coronary arteries by coronary arteriogram. When multivessel disease was stratified into double and triple vessel disease, the outcomes varied. In triplevessel disease, the outcome with CABG was good, but the outcome was unfavorable in those employing medical therapy, particularly in patients with decreased left ventricular (LV) function. In patients with doublevessel disease with good LV function, the longterm results with medical therapy were just as favorable as those with CABG. However, doublevessel disease complicated by reduced LV function (ejection fraction≤40%) had a clearly less favorable outcome when treated with medical therapy than with CABG. Thus, it is important for patients with multivessel disease to undergo revascularization if indicated, to improve their prognosis. On the other hand, the incidence of cardiac events arising from vein graft occlusions tended to increase in CABG patients after 5 years or more following surgery.