Inclusion Criteria:  1. In-patients with acute coronary syndrome to undergo PCI 2. Complete revascularization during the index hospitalization 3. Written informed consent  Exclusion Criteria:  1. Periprocedural complications (coronary artery dissection, perforation, myocardial infarction, stroke, death) 2. Planned coronary revascularization at discharge 3. Patients with severe chronic disease (uremia, liver cirrhosis, COPD (chronic obstructive pulmonary disease) 4. Abnormal blood counts caused by hematological diseases 5. Diagnosed malignancy