Figure 4.

Patient WH19: Archetypal emergence (alpha frequency increase, alpha loss, delta loss). (A) Spectrogram of the observation period. Start of emergence shown as a vertical green line at 900 s, time of patient response as a vertical red line. (B) Frequency of maximal oscillatory alpha power. (C) Concentration of anesthetic gas (C_eMAC), blue line, left vertical axis, and opioid levels as equivalent Fentanyl (C_eFentanyl, ng/ml), green line, right vertical axis. (D) Absolute alpha power (dB) against absolute delta power (dB) for prior to start of emergence (black circles), during emergence period (blue circles), and following recovery of response (ROR).