Burst-suppression ratio underestimates absolute duration of electroencephalogram suppression compared with visual analysis of intraoperative electroencephalogram

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Burst-suppression ratio underestimates absolute duration of electroencephalogram suppression compared with visual analysis of intraoperative electroencephalogram W.G. Muhlhofer, R. Zak, T. Kamal, B. Rizvi, L.P. Sands, M. Yuan, X. Zhang, J.M. Leung British Journal of Anaesthesia Volume 118, Issue 5, Pages 755-761 (May 2017) DOI: 10.1093/bja/aex054 Copyright © 2017 The Author(s) Terms and Conditions

Fig 1 (A) Intraoperative EEG tracing for Stage E, which indicates >10 but <20 s of EEG suppression per 30 s epoch. The FP1 and F7 electrodes overlay the left, while FP2 and F8 overlay the right frontal head region. Sensitivity is measured in microvolts (uv). The space between two dotted lines equals 1 s, and one page represents a 30 s epoch. (B) Intraoperative EEG tracing for Stage F, which indicates >20 s of EEG suppression per 30 s epoch. Details as for (A). British Journal of Anaesthesia 2017 118, 755-761DOI: (10.1093/bja/aex054) Copyright © 2017 The Author(s) Terms and Conditions

Fig 2 Scatterplot showing how the distribution of minutes of EEG suppression differs between the two methods (i.e. calculation of minutes of suppression through visual analysis of the EEG tracing and based on the SedLine® burst-suppression ratio calculated from a proprietary algorithm). British Journal of Anaesthesia 2017 118, 755-761DOI: (10.1093/bja/aex054) Copyright © 2017 The Author(s) Terms and Conditions