Sequential Therapy of Atorvastatin Improve Outcomes of ST-elevated Acute Myocardial Infarction

Inclusion Criteria: * Sighed informed consent * Diagnosised as acute myocardial infarction * Time frame less than 12 hours since the occurance of chest pain * Aggred to receive sirolimus-eluted coronary stents * Patients willing to accepte follow-up Exclusion Criteria: * Allegy to statins or with a history against statin therapy * Allegy to any products that will be used during PPCI * Disagreed to receive PPCI and other related therapy * Existing sever liver dysfuntion that statins can not be used according to the guildlines * Sever kidney dysfunction (creatinine \>3mg/dl or eGFR\<30ml/min) * Sever left ventricular dysfunction (Killip grade 3) * Patients are currently taking medicine that may influence the use of statin * Patients with a history of alcohol abuse or durg abuse * Woman during pregnancy or lactation * Patients who has attended other clinical trials * Patients who has received PCI or CABG previously * Patients who can not agree to accept study protocol * Other conditions that may not sutible for the current study