Fig. 1
From: Anesthesia depth monitoring during opioid free anesthesia – a prospective observational study
Description of Sedline Monitor indices. (A) The four channels of electroencephalography (EEG) representing two locations on right and left frontal lobes respectively. (B) Patient state index (PSI), algorithm-based quantitative index for monitoring of brain function to determine anesthesia depth during general anesthesia. (C) Spectral edge frequency (SEF95) containing 95% of the electric activity, also separated for left and right side. (D) Electromyography (EMG), which is an index over temporal muscle relaxation. Suppression ratio (SR) represents percentage of isoelectric electrical activity (+/- 0.5 µV) per minute in prefrontal and frontal cortex. Artefacts (ARTF) reflect environmental noise as artifacts, conveyed as vertical white lines in DSA. (E) Density spectral array (DSA) showing the power of frequencies over time as a color-scale. The upper and lower part reflects left and right frontal lobes