EEG is a kind of modern auxiliary examination method which can help diagnose the disease by using the EEG recording instrument, which is a kind of modern auxiliary examination to help diagnose the disease. EEG in brain diseases has certain diagnostic value. However, due to various conditions of the restrictions, so in most cases cannot serve as the sole basis for diagnosis, and the need to combined with the patient's symptoms, signs, laboratory examination and auxiliary examination to comprehensive analysis. EEG is mainly used for the examination of intracranial organic diseases, such as epilepsy, encephalitis, cerebral vascular diseases and intracranial space occupying lesions. EEG is very susceptible to interference of various factors, should pay attention to the recognition and exclusion.

Inspection purpose

1 epilepsy: the value of EEG in the diagnosis of epilepsy is the largest, can help determine the diagnosis and classification, to judge the prognosis and analysis of curative effect;

2 brain trauma: ordinary examination is difficult to determine the slight damage to the EEG may be found abnormal;

3 for the diagnosis of brain tumors or injury has a certain help;

4. To determine the brain have implement qualitative sex pathological change, especially to judge is mental disease or encephalitis, and other diseases caused by mental symptoms are valuable, can distinguish hysteria, or malingering is real brain diseases.

5 for biofeedback therapy.

Preparation before examination

1 hair wash, do not rub oil, so as not to affect the inspection;

2 meal, to prevent hypoglycemia effect;

3 check the 3 days before stopping all kinds of drugs, can not stop the drug to explain the name, dosage and usage, so that the doctor's reference.

matters needing attention

1 check the spirit not to be nervous, placed on the scalp to receive electrodes, not power;

2 total body muscle relaxation to avoid interference with emg;

3 by the doctor, eyes open, eyes closed or excessive breathing.

British doctor Richard Caton first observed the brain waves in animals in 1875. Inspired by the success of William Einthoven's electrocardiogram, Hans Berger decided to use the wire current meter to measure electrical activity in the brain.

Figure: the electric wave displayed by color scanning. Red and yellow are active in the brain, while blue is not active.

First, Berger exposed the surface of the dog's brain to the external currents of the brain. Then, he put electrodes in the brain surgery in the scalp off part of the skull. Finally he could through the skull to record brain waves, and collected his family members, friends and other volunteers electroencephalogram (EEGs).

Berger was the first to identify two different types of brain waves, which he called a and B waves, and later used other Greek letters to name the other waveforms. When people think, rest and sleep, the EEG will show different patterns of radio waves. Left: EEG trajectory during epileptic seizure.

EEGs is very useful in the diagnosis of epilepsy. Epilepsy is a disease that involves sensory, motor, and consciousness disorders. Any person may be caused by an accident, an electric shock, or a high fever. Those who are particularly susceptible to seizures should take drugs to reduce the likelihood of seizures.

Human tissue cells are always in spontaneous and constantly real estate with a very weak bio electrical activity. The electrical activity of the brain cells leads to and after amplification electroencephalograph recorded on special paper, namely that certain waveform, amplitude, frequency and phase of the graphics and curves, namely the EEG using electrodes placed on the scalp. When the brain tissue pathological or functional changes, this curve is the corresponding changes, so as to provide evidence for clinical diagnosis and treatment. The clinical significance of EEG: abnormal EEG can be divided into mild, moderate and severe abnormalities.

1 mild abnormal EEG alpha rhythm is irregular or very unstable, eyes disappeared or not significantly inhibit the reaction. High amplitude beta waves appear in frontal area or area. Q wave activity increases, some parts of the Q activity is dominant, and sometimes all the district see Q wave. High amplitude Q wave after ventilation.

2 the activity frequency of moderate abnormal EEG was slowed down, and there was a significant asymmetry. Diffusion Q activity. Paroxysmal Q wave activity. After the gas is over, the high wave amplitude delta waves appear in groups or groups.

3 severe abnormal EEG diffusion Q and delta activity dominant, in the slow wave between the high voltage Delta activity. Alpha rhythm disappears or becomes slow. Paroxysmal Delta wave. Spontaneous or induced high wave spike wave, sharp wave or spike slow wave complex. There burst suppression activity or flat activity. [edit this paragraph] EEG abnormalities have certain help to the diagnosis of the following diseases: 1 consciousness disorders (Shi Shui, coma, etc.).

2 intracranial space occupying lesions: including brain tumors, brain abscess, brain metastases and chronic subdural hematoma, etc..

3 epilepsy.

4 traumatic brain injury: brain concussion, brain contusion, etc..

5 cerebral vascular disease: cerebral hemorrhage, cerebral thrombosis.

6 intracranial inflammation and encephalopathy: viral encephalitis.

What is the significance of EEG in the diagnosis of cerebral vascular disease?

Electroencephalogram is a technology which is used to enlarge the biological activity of human brain tissue, which is mainly used for the examination of nervous system diseases. Because it reflects the "living" of the brain function of the state, so since the 30's, the diagnosis of neurological diseases has been playing a major role.

EEG is mainly used in the diagnosis of epilepsy, brain injury, brain tumor and other diseases. Cerebral vascular disease of the EEG, although no specific changes, but the diagnosis and prognosis of the judgment, as well as with the identification of brain tumors is still very