Clinical Research Directory

Inclusion Criteria: 1. . Age of Patients ≥18 years old; 2. Acute myocardial infarction patients with onset symptoms\<48 hours require emergency PCI; 3. . Diagnosis: Chest pain and other ischemic symptoms accompanied by ST segment elevation in at least two adjacent leads on electrocardiogram (① V2 or V3 lead: male\<40 years ≥ 0.25mV, ≥ 40 years ≥ 0.2mV; Female ≥1.5mV；② Other leads ≥ 1mV), or new left bundle branch block occurs; 4. Criminal blood vessels with clear requirements for emergency PCI; 5. Coronary artery in situ lesions, with a visual reference lumen diameter of ≥ 2mm and ≤ 4mm; Lesion's length\<40mm； 6. After thrombus aspiration and pre dilation, the lesion stenosis is ≤ 50% and there is no C-type or above dissection. 7. He/she or his/her legal representative voluntarily participates in this study and signs an informed consent form. Exclusion Criteria: 1. The patient has allergies or contraindications to the following medications: Heparin, Aspirin, Clopidogrel, Prasugrel, Ticagrelor, Cilostazol, Indobufen, Contrast Medias (Patients with clear contrast agent allergies such as rash but can be controlled with effective drugs such as glucocorticoids and diphenhydramine in advance can be selected); 2. The patient has active pathological bleeding; 3. History of significant gastrointestinal or urogenital bleeding or bleeding tendency within 3 months prior to surgery, known coagulation disorders (including heparin induced thrombocytopenia); 4. Patients who are pregnant or have the intention to become pregnant during the period of research; 5. Non cardiogenic combined lesions show an expected life expectancy of less than one year; 6. Left main trunk's stenosis ≥ 50% 7. History of coronary artery bypass grafting in the past; 8. Intubation or mechanical ventilation status; 9. . Cardiogenic Shock 10. . Without signature on informed consent