Comparison of Biolimus A9 and Everolimus Drug-Eluting Stents in Patients With ST Segment Elevation Myocardial Infarction

The primary objective of this study is: * comparison of a safety and effectiveness of third generation DES (biolimus A9 and everolimus) in patients with STEMI treated by primary PCI with OCT guidance. A rate of 9 month MACE (deaths, myocardial infarction, ischemia driven TLR) will be assessed in both groups. The secondary outcomes are a comparison of (using OCT): * number of uncovered stent struts * number of malapposed stents struts * in-stent neointimal volume * in-segment assessment of vessel wall response to DES