bispectral index


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bispectral index

a measure derived from the domain of time; the frequency and bispectral analysis of the encephalogram that correlates with depth of sedation and anesthesia in clinical medicine.

bispectral index

A measure of the depth of anaesthesia, which is used to titrate the dose of anaesthetic to prevent unintentional regain of consciousness, especially in patients receiving muscle relaxants to prevent movement, who may not provide visual cues indicating pain.

bi·spec·tral in·dex

(bī-spek'trăl in'deks)
A measure derived from the domain of time; the frequency and bispectral analysis of the encephalogram that correlates with depth of sedation and anesthesia in clinical medicine.

bispectral index

Abbreviation: BIS
An electroencephalographic measure of the effect of sedative and hypnotic drugs on an anesthetized patient. It is used (along with clinical assessment of the patient) to determine the level of central nervous system depression. The index ranges from zero (completely unresponsive to stimulation) to 100 (awake and alert). At levels below 60, most patients are adequately sedated for surgery.
See also: index
References in periodicals archive ?
Bispectral index increases and decreases are not always signs of inadequate anesthesia.
The effect of remifentanil on the bispectral index change and hemodynamic responses after orotracheal intubation.
Bispectral index monitoring quantifies depth of sedation during emergency department procedural sedation and analgesia in children.
Depth of anesthesia and bispectral index monitoring.
Myles PS, Leslie K, McNeil J, Forbes A, Chan MTV 2004 Bispectral index monitoring to prevent awareness during anaesthesia: the B-Aware randomized controlled trial The Lancet 363 1757-1763
There have been several case reports in the literature of use of bispectral index for detection of inadequate cerebral perfusion (6,7).
I was involved in a recent prospective, randomized, double-blind, multicenter trial of bispectral index monitoring and found that the technology reduced the risk of awareness in at-risk adult surgical patients undergoing relaxant general anesthesia by 82% (Lancet 2004;363:1757-63).
To date, the Company's Bispectral Index (BIS) technology has been used to assess approximately 32 million patients and has been the subject of more than 3,100 published articles and abstracts.
Currently, the Bispectral Index (BIS) is the most frequently used technology for monitoring anesthetic depth.