Many people do not know enough about coronary angiography, and some patients have a fearful mindset about it. As people’s understanding and treatment of coronary artery disease continues to improve, especially with the rapid progress of coronary artery disease screening and treatment, more and more patients are receiving such screening and treatment. Of course, it becomes more and more important to know more about coronary angiography. What is coronary angiography? Coronary angiography is considered the “gold standard” for the diagnosis of coronary artery disease. A coronary angiogram is a test that uses a contrast medium and special x-rays to show the inside of the coronary arteries. The coronary arteries are responsible for supplying oxygen-rich blood to the heart. A waxy substance called plaque can form in the coronary arteries. A build-up of plaque in the coronary arteries is called coronary heart disease. Do I have to have a coronary angiogram? If you are one of the following people, then your doctor will definitely recommend coronary angiography: 1. Patients with a history of coronary heart disease (coronary heart disease) angina or myocardial infarction; 2. Patients with chest tightness or chest pain and high suspicion of coronary heart disease (coronary heart disease); 3. Patients with recurrent angina after coronary stenting or surgical bypass surgery; 4. Patients over 50 years old who need major surgery 5. Patients with unexplained ECG abnormalities that require exclusion of coronary heart disease (coronary heart disease). Who is not suitable for coronary angiography? Uncontrolled severe ventricular arrhythmias; 2. Uncontrolled hypertension; 3. Uncontrolled cardiac insufficiency; 4. Uncorrected hypokalemia, digitalis toxicity, electrolyte disorders; 5. Fever and infectious diseases; 6. Coagulation disorders; 7. Contrast allergy; 8. Severe liver and kidney dysfunction; 9. Acute myocarditis. These are not absolute contraindications, but relative ones. If these conditions exist, it is necessary to assess which is greater between benefits and risks. What if coronary angiography is not adapted? If you really don’t fit, it is better to do coronary CT. 320-row CT is recommended if conditions allow, the effect is similar to coronary angiography, the price is not too much, and the accuracy is higher. 64-row or 32-row is not good and cannot be used as a basis for diagnosis. What are the precautions before and after coronary angiography? Pre-operative: 1. Tell the doctor the medical history and which medications you are currently taking; 2. Dress comfortably, preferably in a cardigan; 3. Rest the night before the procedure and maintain good sleep quality; 4. All tests requested by the doctor should be completed before the procedure; 5. Fasting and abstaining from food and drink before the procedure according to the doctor’s request. Post-operative: 1. You should drink more water within 24 hours after the operation to expel the contrast agent from your body as soon as possible; 2. You should notify your doctor promptly of any uncomfortable symptoms. After understanding the above, do you have more knowledge about coronary angiography? Here I would like to remind you that coronary angiography is invasive, so many patients refuse to undergo the test because they are worried that it will cause serious damage to their bodies. In fact, according to the current medical level, this kind of worry is not necessary.