<qa>  What is the metabolic status of the patients with stable coronary artery disease?Patients with stable coronary artery disease and successful DES implantation in native coronary arteries will be eligible. They will be stratified at entry according to their metabolic status DM, MS, or no DMMS. Measurements will be performed 6-24 hours after clopidogrel loading dose acute effects and 4 months later under clopidogrel maintenance dose chronic effects. 