Bispectral index
Bispectral Index (BIS)
Bispectral Index (pronunciation: bi-spek-tral in-dex, abbreviated as BIS) is a technology used to monitor the depth of anesthesia during a surgical procedure. It is a complex mathematical algorithm that analyzes the electroencephalogram (EEG) to provide a single number (the BIS value), which represents the patient's level of consciousness.
Etymology
The term "Bispectral Index" is derived from the method used to calculate it. "Bi" refers to the two (or more) EEG signals that are analyzed, "spectral" refers to the frequency spectrum of the signals, and "index" refers to the single number that is produced.
Usage
The BIS value ranges from 0 (indicating a lack of brain activity) to 100 (indicating full consciousness). A BIS value of 40-60 is typically targeted during general anesthesia. The BIS technology is used to help prevent awareness under anesthesia, which is a rare but distressing complication where patients become conscious during surgery.
Related Terms
See Also
External links
- Medical encyclopedia article on Bispectral index
- Wikipedia's article - Bispectral index
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