The purpose of this study is to compare the prognosis of patients with clopidogrel after early discontinuation of ticagrelor/prasugrel with patients who maintained aspirin and ticagrelor/prasugrel as standard therapy in patients with acute myocardial infarction who underwent percutaneous coronary intervention.
Myocardial infarction is defined according to icd-10 using the data base of South korea National Health Insurance Corporation, where personal identification information has already been removed, and detailed results are derived for each drug category.