Inclusion Criteria:  Any patient referred for diagnostic coronary angiography and / or possible PCI in native coronary vessels. Successful (< 30% diameter stenosis and normal TIMI 3 flow post-stenting) and uncomplicated PCI All treated lesions stented with drug-eluting stents (except side-branches of bifurcations)  Exclusion Criteria:  Lesion in saphenous vein or arterial grafts Allergy to aspirin, thienopyridines or ticagrelor precluding treatment for 30 days Sub-optimal PCI result ( >30% residual diameter stenosis and/or <TIMI3 flow) or peri-procedural complications Acute ST-Elevation MI (culprit lesion)