Coronary angiography is a diagnostic procedure for coronary intervention and is currently the “gold standard” for coronary heart disease diagnosis. Many people ask me, are imaging and stenting the same procedure? In fact, imaging is used to diagnose coronary artery disease and stenting is used to treat coronary artery disease. Both procedures are a surgical access and are two different processes of the whole surgery, if you cannot meet the criteria for placing a stent, just do coronary angiography. According to current standards, if coronary artery stenosis is less than 50% on coronary angiography, it is called coronary atherosclerosis; stenosis greater than 50% can be diagnosed as coronary artery disease; and if the stenosis is greater than 75% and there is evidence of ischemia, stent implantation is recommended. The following is about the preparation for the operation and the precautions for the prognosis. First, pre-operative precautions 1, calm your mind, do not be nervous, before the operation to maintain adequate sleep; 2, normal light diet, 70% to 80% full can be, the general requirements of 2 hours before the operation fasting, 1 hour before the operation, no water, no food and drink is mainly to prevent the operation of vomiting caused by aspiration; 3, clean and loose pajamas, cardigan clothing is preferred; 4, before the operation to urinate; 5, puncture is mainly the right radial artery and the femoral artery (except in special circumstances), pre-operation, the right radial artery and the femoral artery, the right artery and the femoral artery. (except in special circumstances), wash your wrist and perineum before surgery, and the nurse will also shave the surrounding hair before surgery. Precautions during surgery 1, relax emotionally, lying flat; 2, except for special circumstances and discomfort, try not to cough violently, do not deep inhalation, do not talk; 3, have discomfort in time, do not move the limbs, to prevent contamination of the surgical surface as well as fall out of bed. Third, after the operation notes 1, radial artery general compression puncture point 6 hours or so, pay attention to observe whether there is no puncture point around the hematoma, pain, relax the limbs, can stretch and flex the elbow joint, but don’t flex the wrist joint, you can let the family members to massage the hand to promote blood reflux; puncture side of the limb 2 weeks don’t lift heavy objects; 2, puncture the femoral artery need to lie down, the puncture side of the limb braking for 24 hours, 12-16 hours, pay attention to observe the puncture point, and don’t talk; 3, any discomfort timely notification, don’t move the limbs, prevent pollution of the surgical surface and fall into bed. 16 hours, pay attention to observe whether there is hematoma at the puncture, whether the distal limb has cyanosis, etc.; 3, drink more water after the operation, more urination to help drain the contrast agent, generally intermittent drinking water of about 1500 ml (except for those who have cardiac insufficiency); 4, a light diet, 70% or 80% satiety can be; 5, there is discomfort in a timely manner to shout to health care personnel; 6, the key instructions — if the stent is placed, the drug must be used in accordance with the doctor’s orders, and shall not stop the antiplatelet drugs without authorization! Stop the use of antiplatelet drugs, unauthorized discontinuation of drugs have stent in acute occlusion, myocardial infarction and even sudden death risk!