In recent years, newer oral P2Y12 receptor blocker (ticagrelor) has been strong recommendations for management of patients with AMI undergoing (PCI). This drug provided more profound inhibitory effects than clopidogrel, which could lead to marked reduction in ischemic events, with relatively increase in bleeding complication, specific to low body weight, especially in women and East Asian patients.
East Asian patients will be required optimal dose of newer P2Y12 inhibitor (ticagrelor) to determine the safer treatment and better outcome. Whether low dose of ticagrelorI is more adequate for clinical practice in Korea is unclear. Therefore, the investigators aim to evaluate efficacy and safety of low dose of ticagrelor in Acute Myocardial Infarction (AMI) undergoing percutaneous coronary intervention(PCI).