Influence of LV Function : LV functions, whether normal or impaired is important while selecting a patient for CABG and for long-term results of surgical revascularisation. If left ventricular function is normal even in the presence of less than critical blocks in all three coronary arteries, medical treatment gives good results. Depressed LV function is an indication for surgery. If the ejection fraction (El?) is more than 0.3, surgical results cue well. However when ejection fraction is less than that risk of surgery becomes greater with poor long-term benefits. Exercise or resting Thallium 201 scintigraphy, dobutamine stress echocardiography or positron emission tomographic (PET) scanning will help in distinguishing ischaemic viable myocardium from a scar.