Dangerous period after cardiac stenting is 24-48 hours, after stent placement in myocardial infarction, the stent lining is prone to thrombus formation, if not handled in time, it will cause a secondary blockage, and it is necessary to closely monitor the changes in the condition, and also prevent the formation of ventricular wall tumors after myocardial infarction, or myocardial infarction, such as ventricular tachycardia, ventricular fibrillation, cardiac rupture, sudden death, and other complications thereof, because these complications at any time can lead to life-threatening conditions. 1-2 days after stent placement for myocardial infarction, continuous oxygen should be given, which can reduce the burden on the heart, and at the same time, blood pressure monitoring, blood oxygen monitoring, etc. At the same time, absolute bed rest should be given, avoiding activities, and avoiding straining to pass stools as straining to pass stools will also increase the burden on the heart. Monitor 24-hour water intake and urine output to prevent heart failure after a heart attack or to prevent the occurrence of a second myocardial infarction.