1, PCI (coronary balloon dilatation) refers to inserting an inflation balloon into the coronary artery through a catheter, and then expanding the narrow coronary artery through the inflation of the balloon to restore smooth blood flow. PCI can be used in electrophysiology laboratory, which usually needs to be performed within a few hours after the onset of myocardial infarction.

2. PPCI (primary coronary intervention) refers to the rapid use of catheter intervention in the treatment of myocardial infarction to restore coronary blood flow and reduce the area of myocardial infarction. PPCI is performed when the patient arrives at the hospital, usually within 90 minutes after the onset of myocardial infarction.