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- W2164865141 endingPage "61" @default.
- W2164865141 startingPage "45" @default.
- W2164865141 abstract "The first attempts to introduce computerized power spectrum analysis of the electroencephalogram (EEG) as an intraoperative anaesthesia monitoring device started approximately 30 years ago. Since that time, the effects of various anaesthetic agents, sedative and analgesic drugs on the EEG pattern have been addressed in numerous studies in human patients and different animal species. These studies revealed dose-dependent changes in the EEG power spectrum for many intravenous and volatile anaesthetics. Moreover, EEG responses evoked by surgical stimuli during relative light levels of surgical anaesthesia have been classified as ‘arousal’ and ‘paradoxical arousal’ reaction, previously referred to as ‘desynchronization’ and ‘synchronization’, respectively. Contrasting reports on the correlation between quantitative EEG (QEEG) variables derived from power spectrum analysis (i.e. spectral edge frequency, median frequency) and simultaneously recorded clinical signs such as movement and haemodynamic responses, however, limited the routine use of intraoperative EEG monitoring. In addition, the appearance of EEG burst suppression pattern and isoelectricity at clinically relevant concentrations/doses of newer general anaesthetics (i.e. isoflurane, sevoflurane, propofol) may have weakened the dose-related EEG changes previously reported. Despite these findings, the EEG power spectrum analysis may still provide valuable information during intraoperative monitoring in the individual subject. The information obtained from EEG power spectrum analysis may be further supplemented by newer EEG indices such as bispectral index and approximate entropy or other neurophysiological monitors including auditory evoked potentials or somatosensory evoked potentials." @default.
- W2164865141 created "2016-06-24" @default.
- W2164865141 creator A5062864902 @default.
- W2164865141 date "2008-01-01" @default.
- W2164865141 modified "2023-09-26" @default.
- W2164865141 title "EEG power spectrum analysis for monitoring depth of anaesthesia during experimental surgery" @default.
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