Global field synchrony during general anaesthesia

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Global field synchrony during general anaesthesia N. Nicolaou, J. Georgiou British Journal of Anaesthesia Volume 112, Issue 3, Pages 529-539 (March 2014) DOI: 10.1093/bja/aet350 Copyright © 2014 The Author(s) Terms and Conditions

Fig 1 International 10/20 electrode placement system and the five aggregate brain areas defined. F, frontal; LT, left temporal; RT, right temporal; P, posterior; and C, central. Electrode layout was drawn using the EEGLab software.21 British Journal of Anaesthesia 2014 112, 529-539DOI: (10.1093/bja/aet350) Copyright © 2014 The Author(s) Terms and Conditions

Fig 2 Mean widespread GFS values for wakefulness and anaesthesia estimated at each frequency range for each patient. British Journal of Anaesthesia 2014 112, 529-539DOI: (10.1093/bja/aet350) Copyright © 2014 The Author(s) Terms and Conditions

Fig 3 Localized GFS trends. Corresponding brain areas: C, central; F, frontal; LT, left temporal; RT, right temporal; P, posterior. (a) δ (1.5–3.5 Hz); (b) θ (3.5–7.5 Hz); (c) α1 (8–10 Hz); (d) α2 (10.5–12 Hz); (e) β1 (12.5–18 Hz); (f) β2 (18.5–21 Hz); (g) β3 (21.5–30 Hz); (h) γ1 (30.5–40 Hz); and (i) γ2 (60–80 Hz). Line thickness corresponds to the ratio: (number of patients with an increase/decrease in the mean GFS)/(total number of patients). British Journal of Anaesthesia 2014 112, 529-539DOI: (10.1093/bja/aet350) Copyright © 2014 The Author(s) Terms and Conditions

Fig 4 GFS measure estimated over the central–right temporal areas at the γ2 (60–80 Hz) frequency range, for a randomly selected patient. Vertical lines indicate important anaesthetic markers. The segments contained within the markers for ‘induction’ and ‘recovery’ correspond to anaesthesia, and the remaining segments to wakefulness. Artifact values caused by diathermy contamination are also indicated in the figure. The 50 segments (100 s) immediately after induction were not included in the analysis (marked as ‘excluded segments’). British Journal of Anaesthesia 2014 112, 529-539DOI: (10.1093/bja/aet350) Copyright © 2014 The Author(s) Terms and Conditions