EEG is a painless and non-invasive brain function test, which is a very important auxiliary test for diagnosing epilepsy and brain function, but it is relatively influenced by the scalp, patient status and other factors. Patients should stop taking sedatives, stimulants, anti-epileptic drugs and other drugs that act on the nervous system 24 hours before the examination, so as not to affect the accurate judgment of the results; 3, patients need to eat before the EEG examination, and should not fast. The doctor will arrange for the patient to take 50g of glucose powder or 50% glucose solution orally or intravenously to prevent the patient from hypoglycemia, which may affect the test results. 4.