The trigeminal evoked potential: Part I. Long-latency responses in awake or anesthetized subjects.

Trigeminal evoked potentials have been elicited with differing methodologies that render responses almost as numerous as the number of laboratories reporting them. Forty-six trigeminal nerves were studied to investigate trigeminal evoked potentials in 20 awake, normal subjects and 20 patients undergoing surgery with general anesthesia. A comparison was made between different methods of surface stimulation and subdermal stimulation. It was concluded that these techniques had no practical use in intraoperative monitoring.