Protective Effect of Beraprost Sodium Tablets on Reperfusion Therapy for Acute STEMI

Inclusion Criteria: * It meets the diagnostic criteria of acute ST segment elevation myocardial infarction: ischemic chest pain lasts for more than 30 minutes and can not be relieved by taking nitroglycerin; ST segment elevation of ECG with two or more adjacent leads, limb lead ≥ 1mm, chest lead ≥ 2mm; Or new left bundle branch block; The serum markers of myocardial necrosis increased at least twice the normal value * Acute myocardial infarction was confirmed by coronary angiography * The clinical and angiographic data were complete * Direct PCI was performed within 12 hours after onset Exclusion Criteria: * Those who do not cooperate in the inspection, have poor compliance and cannot guarantee the completion of the test * Conscious disorder, obvious intellectual disorder and mental disorder * With metal foreign bodies, such as metal prosthesis, intraocular metal foreign bodies, intracranial aneurysm clamp, etc * People with claustrophobia * Had a history of myocardial infarction, PCI and coronary artery bypass grafting * Factors affecting ST segment changes of ECG: complete left bundle branch block, preexcitation syndrome, pacemaker ECG, etc