Acute myocardial infarction is a clinical emergency and sometimes requires emergency thrombolysis; the indications for thrombolysis in acute myocardial infarction include the following: first, persistent ST-segment elevation in two or more adjacent leads, or a medical history suggesting myocardial infarction combined with left bundle branch block, with an onset time of <12 hours and a patient age <75 years; second, acute myocardial infarction with significant ST-segment elevation and a patient age >75 years, after weighing the advantages and disadvantages, thrombolysis can also be performed; third, if the myocardial infarction is more than 12 hours old, thrombolysis is usually not performed. Second, in acute myocardial infarction with significant ST-segment elevation and age >75 years, after weighing the pros and cons, thrombolysis can be performed considering that the patient can still benefit from thrombolytic therapy; third, if the infarction is more than 12 hours old, thrombolysis is generally not performed; if the onset of ST-segment elevation myocardial infarction is more than 12 hours old, but the patient still has persistent ischemic and progressive chest pain with unstable vital signs, thrombolysis can still be considered within 24 hours.