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Standardization of anal sphincter electromyography: normative data.
S Podnar1, D B Vodusek, E Stâlberg
1Institute of Clinical Neurophysiology, Division of Neurology, University Medical Centre Ljubljana, SI-1525, Ljubljana, Slovenia. simon.pdnar@kclj.si
Summary
This study establishes normative data for external anal sphincter (EAS) electromyography (EMG) in healthy adults. These findings provide crucial reference values for diagnosing neurological and pelvic disorders affecting EAS function.
Area of Science:
- Neurophysiology
- Pelvic Floor Diagnostics
- Clinical Electromyography
Background:
- Electromyography (EMG) of the external anal sphincter (EAS) is vital for evaluating conus/cauda lesions, parkinsonism, and anal incontinence.
- Standardized normative data for EAS EMG is essential for accurate clinical interpretation.
Purpose of the Study:
- To establish normative electrophysiological data for the EAS in a large cohort of healthy individuals.
- To define reference ranges for motor unit potential (MUP) and interference pattern (IP) parameters.
Main Methods:
- Sixty-four healthy subjects (19-83 years) underwent standardized EAS EMG.
- Multi-MUP and turn/amplitude analyses were used to assess MUPs and IPs.
- The influence of age, gender, parity, and constipation on EMG parameters was investigated.
Main Results:
- Common reference values were calculated as no significant effect of demographic factors was found.
- Provided specific lower/upper limits for mean MUP amplitude, duration, area, and number of phases.
- Established 'outlier' limits for individual MUPs and normal 'clouds' for IP parameters.
Conclusions:
- The study presents reliable normative data for quantitative EAS EMG.
- These reference values will enhance the diagnostic accuracy of EAS EMG in clinical practice.