Bispectral Index Anesthesia – depth of anesthesia

Since the advent of clinical anesthesia, there has been a continuous need for evaluating the depth of anesthesia. Depth of anesthesia was always important in avoiding either overdose (toxicity) or “underdose” (administering less than absolutely necessary). The problem of overdosing has been partly solved by assignment of dedicated and specially trained doctors to provide anesthesia services, by accumulating more than a 100 years of experience in administering anesthesia, by using safer drugs (volatile and intravenous) with extremely smaller toxicity than the older ones and by recognizing and establishing the stages of anesthesia (such as Guedel stages) and the hemodynamic parameters as indirect but useful indices of the depth of anesthesia. The current trend of minimizing expenses of anesthesia calls for tight titration of drug administration.

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