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Updated: Jan 27, 2026

CMAP Scan MUNE MScan - A Novel Motor Unit Number Estimation MUNE Method
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Multiple Point Stimulation MUNE in ALS: Toward a Faster Modification.

Miguel Oliveira Santos1,2,3, Anna Bystrup Jacobsen1, Hatice Tankisi1

  • 1Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark.

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Summary

A faster method using five surface motor unit action potentials (sMUAP) for motor unit number estimation is as reliable as the standard ten sMUAP method. This quicker approach shows similar accuracy in diagnosing motor neuron disease.

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Area of Science:

  • Neurology
  • Electromyography
  • Motor Neuron Diseases

Background:

  • Motor unit number estimation (MUNE) is crucial for diagnosing neuromuscular disorders.
  • Multiple point stimulation (MPS) is a standard MUNE technique but is time-consuming.
  • A faster MPS protocol could improve clinical efficiency.

Purpose of the Study:

  • To evaluate a modified MPS method using five surface motor unit action potentials (sMUAP).
  • To compare the reproducibility, sensitivity, and specificity of the five sMUAP method against the standard ten sMUAP method.
  • To determine the clinical utility of a faster MPS technique.

Main Methods:

  • Prospective examination of 22 motor neuron disease patients and 20 healthy controls.
  • Two physicians performed examinations twice on the thenar muscles.
  • Analysis of motor unit number estimate (MUNE) recordings using both five and ten sMUAP.

Main Results:

  • Mean MUNE was significantly lower in patients compared to controls with both five and ten sMUAP (P < 0.001).
  • No significant differences in MUNE were found between five and ten sMUAP in either group (P > 0.05).
  • Both methods demonstrated excellent accuracy in distinguishing patients from controls, with comparable reproducibility and sensitivity.

Conclusions:

  • The five sMUAP modification of MPS is a faster alternative to the ten sMUAP method.
  • This faster method offers similar reproducibility, sensitivity, and specificity.
  • The five sMUAP MPS technique is suitable for future research and clinical application.