After the procedure, the patients who had an uneventful PCI will stay in the hospital for 24 h. Blood samples for Troponin I, creatin kinaze (CK) and CK-MB will be collected at 6, 12 and 24 h after the procedure, and for C reactive protein (CRP) after 24h. Complications of the interventions will be documented in the patients study file. Periprocedural myocardial necrosis is defined as rise in troponin I level three times 99th percentile upper limit of reference range, according to definition of myocardial infarction for clinical trials on coronary interventions.