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Related Experiment Videos

Surface vs intramuscular laryngeal electromyography.

T M Hemmerling1, J Schmidt, T Wolf

  • 1Department of Anesthesiology, University Erlangen-Nuremberg, Germany. thomashemmerling@hotmail.com

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|September 16, 2000
PubMed
Summary

Surface laryngeal EMG is comparable to intramuscular laryngeal EMG for monitoring neuromuscular blockade. This method accurately assesses the degree and onset of muscle relaxation without losing vocal cord contact.

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Area of Science:

  • Anesthesiology and critical care medicine
  • Neuromuscular monitoring

Background:

  • Accurate assessment of neuromuscular blockade is crucial during anesthesia.
  • Traditional intramuscular laryngeal electromyography (EMG) can be invasive.

Purpose of the Study:

  • To compare the efficacy of surface laryngeal EMG versus intramuscular laryngeal EMG.
  • To evaluate surface laryngeal EMG's ability to measure neuromuscular blockade after cisatracurium administration.

Main Methods:

  • Prospective study involving ten surgical patients at risk for recurrent laryngeal nerve (RLN) damage.
  • Surface and intramuscular laryngeal electrodes were used, alongside adductor pollicis muscle EMG.
  • Neuromuscular blockade was induced with cisatracurium (0.1 mg/kg) and monitored via single twitch stimulation of the RLN.

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Main Results:

  • Surface laryngeal EMG showed good correlation and comparability with intramuscular laryngeal EMG (r=0.9, 0.8).
  • Mean lag and onset times for surface laryngeal EMG were shorter than for adductor pollicis muscle EMG (P < 0.01).
  • Peak effects were similar between laryngeal and adductor pollicis muscle measurements (92% vs. 95%).

Conclusions:

  • Surface laryngeal EMG is a viable and comparable alternative to intramuscular laryngeal EMG for assessing neuromuscular blockade.
  • Surface electrodes maintain vocal cord contact during muscle relaxation, ensuring accurate onset time and peak effect measurements.