Monitoring Depth of Anesthesia with the EEG

“Is the EEG a measure for the depth of anesthesia?” can be translated as “Is there a uniform, recognizable EEG pattern correlated with graded levels of anesthesia?” and in extension “Is there a correlation between input (dose of the drug and plasmalevels) and output (ERG)?”. Presently, there can be little doubt that the EEG is the best, single, non-invasive and sensitive indicator of cerebral function. In anesthesia, the question then is: do the EEG changes reflect anesthetic depth and, how should one monitor the EEG?

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