• Verna L Baughman, William E Hoffman, Heidi M Koenig, Peggy L Wheeler, Ranga C Ananda, and Mathew Wang.
• Anesthesiology Department, University of Illinois at Chicago, Chicago, IL 60612, USA.
• J Clin Monit Comput. 2005 Jun 1;19(3):201-5.

ObjectiveIt is reported that the electromyogram is an indicator of patient arousal during pain stimulation if anesthesia is inadequate. This may not be true during recovery from succinylcholine induced paralysis. We evaluated State entropy of the electroencephalogram (EEG, 0.8-32 Hz) and Response entropy, a combined measure of the electromyogram (EMG) and EEG (0.8-47 Hz), during recovery from paralysis with succinylcholine.MethodsTwenty patients were randomized to receive either 0.8% (n = 10) or 1.4% isoflurane (n = 10), with 2 mg/kg succinylcholine administered for paralysis in all patients. State entropy and Response entropy were evaluated using a Datex-Ohmeda Entropy module. Frontal EMG was measured separately by an EEG module. State entropy, Response entropy, and EMG were measured in awake patients, during isoflurane anesthesia and paralysis, and after 100% recovery to train of four stimulation.ResultsResponse entropy and State entropy decreased from awake levels in a dose related manner during 0.8% or 1.4% isoflurane and succinylcholine. Recovery from succinylcholine significantly increased Response entropy and EMG in 5 of 10 patients with 0.8% isoflurane and 8 of 10 with 1.4% isoflurane without a change in State entropy.ConclusionAlthough RE and EMG increased during recovery from paralysis with succinylcholine, SE, an indicator of EEG, was not stimulated. EMG activity may not be an indicator of patient arousal after succinylcholine treatment.

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