PMC5678741_01
Displays a QEEG color display showing the seizure detection and high rhythmic run detection on the left hemisphere over approximately 30 minutes of EEG recording. The upper line is the "seizure probability" panel (A), which detects high-frequency events suspicious for seizures. The event triggered the EEG screenshot (see Fig. 2), which was then sent with this accompanying image. The "R2D2"-rhythmic run detection (label B/C) and display showed a similar seizure detection in the QEEG panel. The left hemisphere R2D2 (B) shows a higher frequency and density of activity compared to the right (C) and coincides with the electrical stimulation artifact. A rhythmic asymmetry spectrogram (D) shows dominance of one side vs. the other side in terms of frequency (left = blue, right = red). The final panel (E) at the bottom is an amplitude EEG (aEEG), which trends the averaged amplitude (in microvolts) of each hemisphere (red = right, blue left) which also increases simultaneously. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
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Upon review, it was identified as an artifact generated by tetanic stimulation followed by a 2/second stimulation for 2.5 s (Fig. 1, Fig. 2) and not a true electrographic seizure.