EEG Physiological Monitoring for Brain Function Assessment

The cerebral cortex cells have spontaneous electrophysiological activities. When the brain is damaged by various reasons, it will show abnormal discharges, including changes in frequency and amplitude. EEG technology is to record these brain electrical activities through brain electrodes, and through the processing of computer technology, these brain electrical activities are turned into readable graphics that can more accurately reflect brain electrical activities. The potential on the EEG reflects the postsynaptic potential of the gray matter vertebral body cells, and the rhythm of the EEG is maintained by the brainstem network ascending activation system.

Electroencephalography technology uses sophisticated instruments to measure the rhythmic and spontaneous bioelectric activity of the cerebral cortex, and amplifies the recorded bioelectric signals by millions of times to understand the functional state of the brain. It is often used in the diagnosis and treatment of epilepsy in clinical practice. It is an important method for the diagnosis and classification of epilepsy. It can conveniently, objectively, safely, non-invasively and accurately evaluate the brain function of patients.

The placement of the EEG electrodes adopts the 10–20 system electrode placement method recommended by the International Electroencephalography Society. Its characteristic is that the arrangement of each brain electrode is proportional to the size and shape of the head, and the electrode name matches the brain anatomy zone. With the apex as the center of the circle, you draw straight lines to the temporal halves (divided into 10), and then make concentric circles with the halves of the sagittal line as the radius, and determine the electrode placement position according to the intersection point.

The condition of EEG is closely related to the metabolism of brain cells, and it is more sensitive to brain tissue damage caused by various causes. When brain cells undergo hypoxia and other pathological changes such as brain cell edema and necrosis, the EEG will show amplitude. The frequency changes, and the location of the lesion can be roughly located according to the position of the electrode, which plays an important role in the basic diagnosis process. For patients with severe cerebrovascular disease in clinic, an ordinary and short EEG cannot better reflect the patient’s brain function status. Long-term EEG can monitor the EEG physiological activities of severe patients for a long time at the bedside and provide long-term dynamic information.

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