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The standard concentric needle cannula cannot replace the Macro EMG electrode.

Arne Sandberg1

  • 1Department of Neuroscience, Clinical Neurophysiology, Uppsala University, Uppsala 75185, Sweden.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|September 18, 2013
PubMed
Summary

The standard concentric needle (CN) electrode cannot replace the standard macro EMG electrode for motor unit potential (MUP) amplitude measurements. Technical differences in deep versus superficial recordings likely explain this finding in EMG studies.

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Assessment of the reliability of the motor unit size index (MUSIX) in single subject "round-robin" and multi-centre settings.

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Area of Science:

  • Neurology
  • Electrophysiology

Background:

  • Electromyography (EMG) is crucial for diagnosing neuromuscular disorders.
  • Macro EMG, using a standard macro electrode, is a valuable technique.
  • Standard concentric needle (CN) electrodes are more affordable and widely available.

Purpose of the Study:

  • To evaluate if a standard concentric needle (CN) EMG electrode can substitute for a standard macro EMG electrode.
  • To assess the utility of an affordable, single-use CN electrode in EMG assessments.

Main Methods:

  • Compared motor unit potential (MUP) amplitudes recorded with a standard macro electrode versus the uninsulated cannula of a standard CN electrode.
  • Recordings were taken at two depths in the tibialis anterior muscle, both with and without signs of collateral reinnervation.
Keywords:
CNEMGEMGMacro EMG

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  • Analyzed differences in MUP amplitudes based on recording depth and electrode type.

    • Main Results:

    • MUP amplitudes recorded with the CN electrode cannula were lower for deep motor units compared to those from the macro electrode.
    • Deeply recorded MUPs with the CN cannula showed lower amplitudes than superficially recorded ones.
    • Standard macro EMG signals did not exhibit differences in MUP amplitudes between deep and superficial recordings.

    Conclusions:

    • The uninsulated cannula of the standard CN electrode is not a suitable substitute for the standard macro EMG electrode.
    • Technical factors, likely related to shunting effects at different recording depths, impede the CN electrode's use for macro EMG.
    • This finding highlights the specialized role of macro electrodes in obtaining reliable MUP amplitude data.