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Decisions surrounding the use of bypass surgery in patients with ischemic left ventricular systolic dysfunction (LVSD) are challenging. First, although some consider it an article of faith that bypass for multivessel coronary disease provides the greatest benefit for patients with LVSD, the clinical trials that underlie this belief almost entirely excluded patients with severe LVSD. Furthermore, medical therapy has evolved considerably since publication of the seminal coronary artery bypass grafting (CABG) trials. Second, although some evidence supports an association between myocardial viability and recovery of LV function after revascularization, whether CABG improves more-meaningful outcomes in patients with myocardial viability is not e…