In this study, 63% of patients with a substantial amount of viable myocardium showed an increased left ventricular ejection fraction (LVEF) 12 ± 3 months after coronary artery bypass grafting. In 93% of these patients, increased LVEF persisted at 4.5 ± 1 years of follow-up. Conversely, in nonviable patients, LVEF did not increase at 12 ± 3 months or at follow-up of 4.5 ± 1 years.

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Journal The American Journal of Cardiology
Rizzello, V, Poldermans, D, Biagini, E, Kertai, M.D, Schinkel, A.F.L, Boersma, H, … Bax, J.J. (2004). Comparison of long-term effect of coronary artery bypass grafting in patients with ischemic cardiomyopathy with viable versus nonviable left ventricular myocardium. The American Journal of Cardiology, 94(6), 757–760. doi:10.1016/j.amjcard.2004.05.059