Cardiography is a kind of interventional surgery, before and at the time of cardiography as well as after cardiography, you need to pay attention to the following aspects:1. Avoid tension and rest well before cardiography, if you have hypertension or diabetes mellitus, you need to control your blood pressure and glucose strictly within the normal range, and diabetic patients should stop taking metformin for more than 48 hours before cardiography.2. Maintain a stable emotional state during the imaging process, because many people will be nervous when having an imaging, and nervousness will cause the heart rate to be too fast, and the blood vessels will be easy to spasm and contract.3. Because many people will be nervous when doing imaging, nervousness will lead to rapid heart rate, blood vessels are prone to spasm, contraction. 3, after the imaging should be appropriate to drink water, because drinking water will help the excretion of contrast medium, as the wrist will be placed at the wrist after the imaging, the purpose of the compressor is to prevent arterial hemorrhage, the compressor needs to be decompression every 1-2 hours, and also to observe the arm with or without swelling.