Thrombolysis in myocardial infarction should preferably be performed within 3 hours. If thrombolysis is performed within 3 hours of onset, it is not much different from the effect of stenting, which is the best time for thrombolysis. If 3 hours have elapsed, thrombolysis within 6 hours is also possible. After 6 hours, 12 hours is fine. In general, the longer the time, the less effective it is. After 24 hours, it is usually not suitable for thrombolysis, and after 12 hours, it is usually not suitable for thrombolysis. The best time is within 3 hours, and thrombolysis within 3 hours of heart attack is the most suitable, the sooner the better.