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• W1964935857 abstract "In Brief With the introduction of bispectral index (BIS) as a measure of a patient’s sedation during general anesthesia, attention has been directed toward bispectral analysis of electroencephalography (EEG). In the present study we evaluated the relationship between EEG bicoherence and sevoflurane concentration. Sixteen ASA physical status I–II patients scheduled for elective abdominal surgery were enrolled in the study. Anesthesia was induced with 5% sevoflurane and maintained with sevoflurane and oxygen (50%). Just before surgery, IV fentanyl (2 μg/kg) was given and then continuously infused (2 μg · kg−1 · h−1). Using software we developed, EEG bicoherence, BIS, and 95% spectral edge frequency (SEF95) were recorded at end-tidal sevoflurane concentrations of 0.5%, 0.8%, 1.1%, 1.4%, 1.7%, 2.0%, and 2.3%. Under light anesthesia, EEG bicoherence values were low. With increasing sevoflurane concentrations, 2 peaks of bicoherence emerged along the diagonal line (f1 = f2). Both the first (at around 4 Hz) and second (at around 10 Hz) grew higher (37.7% ± 7.5% and 35.1% ± 9.0%, respectively) as the sevoflurane concentration increased to 1.4%. However, the first peak leveled off whereas the second tended to decrease slightly with further increases in sevoflurane concentration. The BIS value decreased as the sevoflurane concentration increased and leveled off at 1.4% and higher concentrations of sevoflurane. The SEF 95 also decreased as the sevoflurane concentration increased up to 2.3%. Thus the distribution pattern of the two bicoherence peaks is likely to be better than BIS of the anesthetic effect of sevoflurane during surgery. IMPLICATIONS: Electroencephalographic bicoherence significantly changed with different concentrations of sevoflurane, which suggests that the distribution pattern of bicoherence values is likely to be a good indicator for assessing the sedative effect of sevoflurane during the surgery." @default.
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• W1964935857 date "2006-09-01" @default.
• W1964935857 modified "2023-10-10" @default.
• W1964935857 title "Changes in Electroencephalographic Bicoherence During Sevoflurane Anesthesia Combined with Intravenous Fentanyl" @default.
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• W1964935857 doi "https://doi.org/10.1213/01.ane.0000229699.99371.3c" @default.
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