Electroencephalography (EEG) is a modern auxiliary examination method that applies electronic amplification technology to amplify the spontaneous bioelectric activity of the brain and record the brain wave curve on the scalp, which is mainly used to examine brain function to help diagnose diseases . EEG examination includes conventional EEG (special evoked EEG), dynamic EEG, video EEG (dynamic + video), etc. Video EEG monitoring is a new type of EEG examination developed recently, which can combine the clinical manifestation of the patient’s seizure and the simultaneous changes of EEG activity, and get the video of the patient’s simultaneous clinical manifestation while obtaining the patient’s EEG record. Is it harmful to my body to have an EEG? The EEG is a non-invasive detection technique that does not cause any trauma to the person being examined and is painless. Preparation before EEG 1. Wash your hair: Because the application of head oil and hair wax will affect the electrode conduction, you should wash your hair the day before EEG and avoid applying hair oil and hair wax. 2.Eating: EEG should be done after eating, preferably within 0.5 to 2 hours after meal. 3. Drugs: Some drugs have some effect on the EEG tracing. Therefore, it is necessary to explain to the EEG doctor in detail whether you are taking certain drugs, the dosage and method of medication before the EEG examination. 4. Sleep: Do not be overly tired and lack of sleep before the examination. Because in the case of fatigue and too little sleep, the patient will easily fall asleep, which has a certain effect on the waveform of the EEG. 5.For those who are too young or cannot cooperate with the examination, the examination can be considered under the guidance of clinician after drug sleep if necessary. Under what circumstances can EEG be considered? 1.Epilepsy: It is an important test for diagnosis and typing of epilepsy, and can help observe the effect of treatment and judge the prognosis. There is no test that can replace EEG in epilepsy diagnosis and treatment. 2. Traumatic brain injury: EEG may find abnormalities in minor brain injuries that are difficult to determine by general examination, such as concussion when CT may appear normal, while EEG may have abnormalities. 3, central nervous system infection, such as various meningitis, encephalitis, cerebral parasitic disease, etc. 4.Headache, dizziness, syncope, sleep disorders, mental and emotional disorders, etc. 5.Disorders of consciousness, EEG abnormalities can occur in carbon monoxide poisoning, alcohol poisoning, hypoxia, drug poisoning. 6.It is helpful to diagnose brain tumor. 7.Cerebrovascular disease:cerebral hemorrhage, cerebral infarction. 8.Diseases of intelligence disorders, such as congenital dementia, hydrocephalus, mental retardation, cerebral palsy, etc. 9, metabolic diseases, such as hepatic encephalopathy, hepatomegaly, uremia and other various encephalopathies. Under what circumstances can video EEG be considered? Patients with clinical suspicion of epilepsy, but no seizure abnormal waves are seen on the general EEG due to the short examination time, video EEG may be considered to increase the positive rate of the examination. What are the common typical epileptiform discharge waveforms? Common typical epileptiform discharge waveforms include spike wave, spike wave, spike-slow wave, spike-slow wave, multi-spike wave, multi-spike slow complex wave, etc. At present, the main examination work of EEG machine in our hospital includes: 1.Special evoked EEG. 2.Dynamic EEG (2-hour video EEG). 3.24 hours EEG video monitoring dynamic EEG.