What are the main elements of pre-procedure preparation for coronary intervention? Preoperative conversation and informed consent signing 1. Informed consent: Before PCI, the interventional surgeon needs to discuss the indications and risks of the procedure with the doctor in charge, discuss the advantages and disadvantages of interventional therapy, CABG and drug therapy with the patient and family, and clarify the benefits and risks, including the possible complications during and after the procedure, in order to obtain the patient’s understanding and consent, and sign the informed consent form. Preoperative medication adjustment 2. For preoperative application of clopidogrel for less than 3 days take 300mg clopidogrel 6 hours in advance, if preoperative preparation is less than 6 hours, apply 600mg loading dose, if it has been applied continuously (75mg/day) for more than 3 days, no more loading dose can be added, if aspirin is not applied, aspirin 300mg is required to be given in the evening of 1 day before surgery. 3.Eating and drinking should be prohibited after midnight. If diabetic patients are scheduled for surgery in the morning, glucose-lowering drugs and insulin should be stopped in the morning of surgery, and if surgery is scheduled in the afternoon, patients can be allowed to eat a small amount of food. 4. Patients who are using heparin or low-molecular heparin should stop using them once in the morning of the day of surgery. 5.Patients with renal insufficiency or at high risk of contrast nephropathy, fully hydrate before surgery and discontinue drugs that may lead to contrast nephropathy, and advise patients to use contrast agents that have relatively little effect on renal function. 6.For those who are allergic or have previous allergy to contrast agents, it is recommended to start taking prednisone 30mg/day 3 days before surgery or give dexamethasone 5mg before surgery. 7.Prepare skin in the inguinal region bilaterally, and prepare skin in both upper limbs for those who intend to perform radial artery puncture. 8.Evaluate the arterial vascular condition of the surgical access by palpating the radial artery pulsation, Allen’s test and, if necessary, the application of vascular ultrasound.