Anesthesia, General Clinical Trial
Official title:
Comparison of the Bispectral Index and the Entropy of the Electroencephalogram During Total Intravenous Anesthesia
To compare Bispectral index and entropy during maintenance of anesthesia
Several monitors are currently proposed to evaluate the depth of hypnosis. Among them,
Bispectral Index (BIS) is a well known and widely used parameter derived from the patient's
electroencephalograph (EEG). Spectral entropy relies on the extent of disorder in both EEG
and electromyography (EMG) signals and returns 2 values: State Entropy (SE) and Response
Entropy. SE is computed over the frequency range of 0.8-32 Hz and reflects the level of
hypnosis while Response Entropy is computed over the frequency range of 0.8-47 Hz and
reflects also EMG activity. BIS and SE are dimensionless numbers scaled from 100 to 0 for
BIS and from 91 to 0 for SE.
The BIS and Entropy manufacturers claim that adequate level of anesthesia is defined by a
BIS or SE value between 40 and 60. But some observations have shown that the monitors
provided different information. These observations led us to carry out this prospective
observational study designed to study the comparability between BIS and SE during the
maintenance period of propofol-sufentanil anesthesia.
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Time Perspective: Prospective
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