Last few decades have seen tremendous increase in patients with ischemic heart disease and despite advances in medical treatment patients with severe LV dysfunction are on rise due to improved survival rates. The myocardial revascularization has been attempted to aim at improving myocardial function and thereby symptomatic as well as survival benefit. LV dysfunction may be due to myocardial stunning and hibernation which are reversible causes of LV dysfunction and viability testing helps in differentiating them from necrosed myocardium as revascularization in patients with nonviable myocardium has no benefit but may be harmful.

Keywords: Viability; Revascularization; Pet; Spect; Cmr; Dobutamine.