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Clinical validation of electromyography and acceleromyography as sensors for muscle relaxation

Published online by Cambridge University Press:  01 October 2007

P. Hänzi
Affiliation:
University Hospital of Bern, Department of Anaesthesiology, Murtenstrasse, Bern, Switzerland
D. Leibundgut
Affiliation:
University Hospital of Bern, Department of Anaesthesiology, Murtenstrasse, Bern, Switzerland
R. Wessendorf
Affiliation:
University Hospital of Bern, †Department of Anaesthesiology, Kreiskrankenhaus Erding, Bajuwarenstrasse, Erding, Germany
R. Lauber
Affiliation:
University Hospital of Bern, Department of Anaesthesiology, Murtenstrasse, Bern, Switzerland
A. M. Zbinden
Affiliation:
University Hospital of Bern, Department of Anaesthesiology, Murtenstrasse, Bern, Switzerland
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Summary

Background and objective

The aim of this study was to determine which of two clinically applied methods, electromyography or acceleromyography, was less affected by external disturbances, had a higher sensitivity and which would provide the better input signal for closed loop control of muscle relaxation.

Methods

In 14 adult patients, anaesthesia was induced with intravenous opioids and propofol. The response of the thumb to ulnar nerve stimulation was recorded on the same arm. Mivacurium was used for neuromuscular blockade. Under stable conditions of relaxation, the infusion-rate was decreased and the effects of turning the hand were investigated.

Results

Electromyography and acceleromyography both reflected the change of the infusion rate (P = 0.015 and P < 0.001, respectively). Electromyography was significantly less affected by the hand-turn (P = 0.008) than acceleromyography. While zero counts were detected with acceleromyography, electromyography could still detect at least one count in 51.1%.

Conclusions

Electromyography is more reliable for use in daily practice as it is less influenced by external disturbances than acceleromyography.

Type
Original Article
Copyright
Copyright © European Society of Anaesthesiology 2007

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