Effect of Intravenous Metoprolol Combining RIC on Myocardial Protection in STEMI Patients

This study is a prospective, multi-center, randomized controlled study. It is planned to enroll 1200 patients with anterior STEMI. Immediately after the first medical contact, the patients who were determined by the investigator to meet the inclusion/exclusion criteria were randomized through the interactive web response system (IWRS) and received different pre-reperfusion treatments. The four groups were placebo group, metoprolol group, remote ischemic conditioning (RIC) group and metoprolol \& RIC group. Subsequently, the investigator conduct diagnosis and treatment according to the patient's specific conditions and check the serum level of myocardial damage markers (i.e. CK and CK-MB) at the time of admission, 12, 24, 36, 48, 60 hours, respectively. If the patient undergoes PCI treatment, additional detection of myocardial damage markers immediately after PCI is also required. All patients were followed for 1 year with an office visit or a telephone call at 1, 3, 6, 9 and 12 months to evaluate the health status and adverse clinical events of patients.