If your heart rate is too fast when you have an ECG, you can relieve your tension through psychological counseling, listening to songs, etc. However, it is not recommended to take medication to lower your heart rate, as it will cover up your condition. 1. Psychological guidance: you can take a few deep breaths to relax, adjust the heart rate and relieve tension. And let the muscles relax, do not let the muscles in tension. 2. Or try to divert your attention, listen to songs, chat, etc. to relieve tension. Maybe the first time to do ECG will be a little bit of psychological pressure, will be a little bit afraid, but routine ECG is a non-invasive examination, usually will not have any damage to the body, so need to popularize the ECG related knowledge, so that the patient understands, so as to rest assured and relaxed to do the examination. It is normal for the heart rate to increase when doing ECG, if the heart rate is still too fast when not doing ECG, it is recommended to actively consult the doctor and follow the doctor’s instructions for reasonable diagnosis and treatment.