The function and significance of EEG

We know, beware of the former district is not timely, to do ECG examination; stomach is not timely, it should be gastroscopy; and when the head is not timely, sometimes the doctor will be on your EEG check. So, why do you want to carry out an EEG examination, EEG can find out what the disease? The human body's brain has 14 billion brain cells, which have more and more nerve cells. Nerve cell activity can produce a variety of bio electrical signals, EEG is the use of EEG recording the human body's brain electrical information. As long as the EEG machine detector electrodes attached to the scalp, the instrument will be able to receive the electrical activity of the brain the potential changes, when scanning pen will in moving drawings depict various curves. Because of the frequency and amplitude curves with different form different waveforms, formed the EEG tuppo.

In general, each person's EEG has its inherent characteristics. EEG is divided into slow wave and active wave, in normal physiological conditions, there are normal physiological rhythm and inherent characteristics,

And when the EEG abnormalities, there may be a hint of lesion. Therefore, when evaluating the physiological function of the brain, we can carry out the EEG examination. Because EEG is a kind of non traumatic examination method, so it can be repeated several times. What disease require electroencephalogram (EEG)? (1) mental illness: in order to the spirit of the diagnosis of schizophrenia, manic depression, mental disorders, to do EEG, excluding including epilepsy, other brain disorders.

(2) epilepsy: due to epilepsy in the seizure EEG can be accurately recorded scattered in the slow wave, spike or irregular spikes, so for the diagnosis of epilepsy, EEG examination is very accurate.

(3) some substantial lesions in the brain: some brain tumors, brain metastases, brain hematoma, etc., are often caused by varying degrees of EEG changes. These EEG changes, according to the location, nature, stage and damage of the lesion, can be slow waves, this kind of slow waves, can be diagnosed with brain lesions. Electroencephalogram (EEG) is an effective method to examine the changes of brain function, due to the changes of brain function is dynamic, changeable, so to some clinical brain dysfunction of patients in an EEG examination found no abnormalities cannot be completely ruled out the presence of brain disease, and should be regular review of the EEG, in order to accurately detection of disease. In addition, in the EEG examination, in advance to wash your hair, in order to maintain a clean head surface, in order to normal conduction current. When the checker come into contact with the scalp, don't be nervous, gentle breathing, cooperate with the doctor, do eeg.

Any of the following criteria in the adult EEG are abnormal eeg.

1, the basic rhythm of the dominant frequency in 8 times / sec following slow wave was widely moderate abnormal or severely abnormal, the advantage and the basic rhythm for 14 times / s over the high amplitude of the fast wave (over 30uv), but low amplitude fast wave pattern in general is a normal.

2, the basic rhythm of mixed with the onset of slow wave, slow frequency is 0.5-3 times / seconds delta wave is abnormal (widely moderate abnormal or severely abnormal); slow wave frequency for 4 - 7 times / second theta waves.

3, the basic rhythm of the average amplitude of abnormally high (15uV or more, wide and moderate abnormal) or the opposite of the basic rhythm become flat, and sometimes only the low wave amplitude of irregular slow waves (extensive moderate abnormal or severe anomalies).

4, given all the wake sleep stimulation (such as eye opening) does not appear to be basic rhythm of one side or both side of inhibition (localized abnormality or extensive mildly abnormal).

5, the amplitude of the basic rhythm in the left and right symmetrical parts have a constant more than 20% of the differences between the limitations of the anomaly. But there are more than 50% of the differences in the occipital diagnosis significance. In addition, there are more than 10% differences in the average cycle (or average frequency) of the left and right symmetrical parts.

6, there are spikes, sharp waves, spike a slow wave or sharp (tip) a slow wave or induced by the test and produce abnormal waves (localized or widespread abnormal).

7. The emergence of paroxysmal explosive slow wave and fast wave, or after induced and produce more abnormal waves (limited or extensive abnormal).

Fast 8, normal sleep