If in lad there are 2 stenosis each 60% and in rca there is one long stenosis 50% .whether cabg may be performed?

More info: Based on those percentage of blockage CABG is probably not indicated now. You should have some performance evaluation to see if the blockages are more severe or affecting your heart when oxygen demand goes up like in exercise. CABG will fail if there is too much flow in the native arteries. Control BP, don't smoke, and modify risk factors through diet and exercise if blockages are not symptomatic

More info needed: This is a tough one. There is some robust data that suggests aggressive medical therapy is non-inferior to "revascularisation" (CABG, PCI) in patients with "stable" angina. That is, not having an acute event. AGgressive med therapy is statins, ASA, beta-blocker at good doses. Maybe even Plavix (clopidogrel). BUT in DM this may be less so. Depending on sxs you should decide & have open dialogue with cardiologi