Phase lag entropy as a hypnotic depth indicator during propofol sedation
Autor: | Jiyoun Bang, Gyu-Jeong Noh, K. M. Kim, Byung Moon Choi, Yong Hun Lee, S. Ki |
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Rok vydání: | 2019 |
Předmět: |
Adult
Male Correlation coefficient medicine.drug_class Entropy Sedation Conscious Sedation Propofol sedation Hypnotic 03 medical and health sciences 0302 clinical medicine 030202 anesthesiology medicine Humans Hypnotics and Sedatives Entropy (information theory) 030212 general & internal medicine Propofol Aged business.industry Electroencephalography Middle Aged Phase lag Logistic Models Anesthesiology and Pain Medicine Anesthesia Bispectral index Female medicine.symptom business medicine.drug |
Zdroj: | Anaesthesia. 74:1033-1040 |
ISSN: | 1365-2044 0003-2409 |
Popis: | Phase lag entropy, an electro-encephalography-based hypnotic depth indicator, calculates diversity in temporal patterns of phase relationship. We compared the performance of phase lag entropy with the bispectral index™ in 30 patients scheduled for elective surgery. We initiated a target-controlled infusion of propofol using the Schnider model, and assessed sedation levels using the Modified Observer's Assessment of Alertness/Sedation scale every 30 s with each stepwise increase in the effect-site propofol concentration. Phase lag entropy and bispectral index values were recorded. The correlation coefficient and prediction probability between phase lag entropy or bispectral index and the sedation level or effect-site propofol concentration were analysed. We calculated baseline variabilities of phase lag entropy and bispectral index. In addition, we applied a non-linear mixed-effects model to obtain the pharmacodynamic relationships among the effect-site propofol concentration, phase lag entropy or bispectral index and sedation level. As sedation increased, phase lag entropy and bispectral index both decreased. The prediction probability values of phase lag entropy and bispectral index for sedation levels were 0.697 and 0.700 (p = 0.261) and for the effect-site concentration of propofol were 0.646 and 0.630 (p = 0.091), respectively. Baseline variability in phase lag entropy and bispectral index was 3.3 and 5.7, respectively. The predicted propofol concentrations, using the Schnider pharmacokinetic model, producing a 50% probability of moderate and deep sedation were 1.96 and 3.01 μg.ml-1 , respectively. Phase lag entropy was found to be useful as a hypnotic depth indicator in patients receiving propofol sedation. |
Databáze: | OpenAIRE |
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