A bispectral index (BIS) monitor is a neurophysiological monitoring device which continually analyses a patient's electroencephalograms during general anaesthesia to assess the level of consciousness during anaesthesia. The "depth of anaesthesia" is commonly used as a surrogate for "the likelihood of forming experiences or memory", known as surgical awareness. The use of BIS monitors is increasing.
At least one professional body has announced recommendations that BIS be used routinely. The Sociedad de Anestesiología Reanimación y Terapéutica del Dolor de Madrid recommends monitoring of anaesthetic depth in accordance with literature-based evidence. BIS, however, is not explicitly endorsed. In fact, they cite an American Society of Anesthesiologists (ASA) statement saying that the decision for cerebral function monitoring should be made on an individual basis.[1]
The efficacy of BIS index monitoring is not without controversy.[2] Some controlled studies have found that using the BIS reduced the incidence of memory but this was not confirmed in several very large multicenter studies on awareness.
At least one professional body has announced recommendations that BIS be used routinely. The Sociedad de Anestesiología Reanimación y Terapéutica del Dolor de Madrid recommends monitoring of anaesthetic depth in accordance with literature-based evidence. BIS, however, is not explicitly endorsed. In fact, they cite an American Society of Anesthesiologists (ASA) statement saying that the decision for cerebral function monitoring should be made on an individual basis.[1]
The efficacy of BIS index monitoring is not without controversy.[2] Some controlled studies have found that using the BIS reduced the incidence of memory but this was not confirmed in several very large multicenter studies on awareness.
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