Combination therapy of rosuvastatin 5mg and ezetimibe 10 mg showed similar achievement rate in decreasing LDL cholesterol level by 50% as single use of rosuvastatin 20 mg.

This trial aims to prove non-inferiority of concomitant usage of low dose rosuvastatin and ezetimibe among patients with acute myocardial infarction who went through percutaneous coronary intervention at decreasing major adverse cardiac events compared to the efficacy of single use of high dose rosuvastatin.

IMPROVE-IT (Improved Reduction of Outcomes: Vytorin Efficacy International Trial) study showed that even when statin is not used as a treatment the rate of decrease of LDL cholesterol is correlated to the risk of heart disease. Yet whether concomitant use of ezetimibe and statin will have similar degree of clinical efficacy as single use of high dose statin in decreasing LDL cholesterol level needs further examination.

Inclusion Criteria:

1. Adults Aged 19 and up
2. Patients diagnosed with myocardial infarction (both ST segment elevation and non-ST segment elevation) who were treated with percutaneous coronary intervention (Myocardial infarction defined as in the 4th Universal Definition of Myocardial Infarction)
3. For female patients who are of childbearing age, subjects that agreed on taking mandatory pregnancy test
4. Patients who agreed and signed on the informed consent form

Exclusion Criteria:

1. Patients with life expectancy of a year or less due to malignancy
2. Patients with chronic liver disease
3. Patients with sensitivity to active ingredient of the research drugs (ezetimibe and/or rosuvastatin) or patients who are prohibited to take ezetimibe and/or rosuvastatin.
4. Pregnant and/or breastfeeding
5. Female patients who are unable to use any means of contraception
6. Patients receiving hemodialysis, peritoneal dialysis patients and/or kidney transplant patients, due to end stage renal disease
7. Patients who participated in other clinical trial(s) within 3 months from the screening (except non-interventional observational study)
8. Patients considered inappropriate for the study for any other reason(s) by the inspector(s)

Aggregate summary data available on reasonable request. Exceptionally, and subject to Steering Committee approval, deidentified core analytic IPD may be accessed in a secure, non-downloadable virtual environment at the coordinating center. Contact PI (Kiyuk Chang) with proposal + ethics documentation; DUA required; costs may apply.