Orexin-A Facilitates Emergence from Propofol Anesthesia in the Rat

In rats, c-FOS positive (i.e. “active”) orexinergic neurons were reduced during propofol anesthesia, and restored during emergence. Microinjection of orexin-A into the basal forebrain caused a reduction in burst suppression ratio on EEG, and reduced time to emergence from propofol anesthesia. These results suggest that activation of orexinergic signaling plays a role in emergence from propofol anesthesia.