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1. Activity of the mimetic muscles of the upper face were recorded from awake and anesthetized patients by surface electromyography (SEMG). 2. High amplitude SEMG accompanied ketamine anesthesia and/or the presentation of pain-provoking stimuli. 3. During periods of elevated facial muscle activity, fentanyl or butorphanol decreased SEMG amplitude. 4. The opioid-induced SEMG depression was not consistently associated with either lowered vigilance or analgesia but did provide an objective measure of drug effect.
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