 1. Patients undergoing PCI in whom at least one DES is implanted and in whom PCI of all treated lesions is successful diameter stenosis 30 with TIMI 3 flow in all treated lesions without major complications defined as freedom from procedural death, intra-procedural stent thrombosis, procedural myocardial infarction or sustained vessel closure, or need for emergency bypass graft surgery. One or more bare metal stents BMS may be implanted, and other lesions may be treated without stenting as long as at least one DES is implanted. However, the procedure must be successful and uncomplicated as defined above for all lesions DES BMS non-stent. 