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Can be sphincter electromyography reference values shared between laboratories?

Simon Podnar1, W Thomas Gregory

  • 1Institute of Clinical Neurophysiology, Division of Neurology, University Medical Center Ljubljana, Ljubljana, Slovenia. simon.podnar@kclj.si

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This summary is machine-generated.

Reference values for sphincter electromyography (EMG) can be shared between labs, but strict adherence to original protocols is crucial. Minor differences in data arise between investigators, necessitating careful application of external reference data.

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Area of Science:

  • Neurophysiology
  • Diagnostic Imaging
  • Clinical Electrophysiology

Background:

  • Sphincter electromyography (EMG) is vital for diagnosing neuropathic sacral lesions.
  • Quantitative EMG analysis enhances diagnostic utility but requires reliable reference values.
  • The validity of sharing reference data across different electrodiagnostic laboratories remains unconfirmed.

Purpose of the Study:

  • To assess the reproducibility of external anal sphincter (EAS) motor unit potential (MUP) parameters obtained by the same and different investigators.
  • To determine if reference data from one laboratory can be reliably used by another.

Main Methods:

  • Confidence intervals and sensitivity of EAS MUP parameters were calculated from three control groups of women (N=41, 48, 66).
  • Data were obtained by the same investigator (groups 1 & 2) and a different investigator (group 3).
  • Sensitivities for diagnosing neuropathic changes were compared between data sets.

Main Results:

  • Slightly more significant differences in MUP parameter means (3/7 vs 2/7) and outliers (4/14 vs 3/14) were observed between different investigators compared to the same investigator.
  • Sensitivity differences for diagnosing neuropathic changes were also slightly higher between different investigators (7/14 vs 6/14).

Conclusions:

  • Differences in confidence intervals were larger between different investigators, likely due to variations in recruited populations and techniques.
  • Reference intervals from other laboratories can be utilized for sphincter EMG analysis.
  • Strict adherence to the exact protocols of original normative studies is essential when applying external reference data.