Class I indications for myocardial revascularization for improvement of prognosis:
silent cardiac ischaemia + left main coronary artery stenosis of > 50%, 
silent cardiac ischaemia proximal LAD stenosis of > 50%,
silent cardiac ischaemia + impaired LV function + multi-vessel coronary artery disease,
silent cardiac ischaemia + single patent coronary artery stenosis of > 50%,
silent cardiac ischaemia including > 10% of left ventricular and caused by coronary artery stenosis of > 50%.

Class III indication for myocardial revascularization for improvement of prognosis:
silent cardiac ischaemia including < 10% of left ventricular + one-vessel coronary artery disease + absence of proximal LAD stenosis