Effect of Shexiang Tongxin Dropping Pills on Microcirculation in Patients With AMI

Inclusion Criteria: * Age ≥ 18 years old, no gender limit; * Anterior wall STEMI within 12 hours of onset (diagnostic criteria: ischemic chest pain lasting ≥30min; ST-segment elevation or new left bundle branch block in two or more adjacent leads on the ECG; with or without Elevated myocardial markers), emergency PCI treatment is planned; * Infarct-related coronary vascular anatomy is suitable for PCI treatment; * Agree and cooperate to participate in this research, and sign an informed consent form Exclusion Criteria: * Past history of myocardial infarction history; * The arteries related to infarction have received PCI in the past; * Past CABG history; * Killip grade of cardiac function ≥ grade III or cardiogenic shock; * Systolic blood pressure ≤90mmHg; * Bradycardia, heart rate \<60 beats/min, or atrioventricular block of degree II or more; * Allergic to Shexiang Tongxin Dropping Pills * Past history of asthma or severe COPD; * Severe liver and kidney dysfunction; * Participate in other clinical trials within 3 months; * Pregnancy or breastfeeding.