Standardization of anal sphincter electromyography: normative data
S Podnar, DB Vodušek, E Stålberg - Clinical neurophysiology, 2000 - Elsevier
S Podnar, DB Vodušek, E Stålberg
Clinical neurophysiology, 2000•ElsevierObjectives: Electromyography (EMG) of the external anal sphincter (EAS) is important in the
evaluation of conus/cauda lesions, the differential diagnosis of parkinsonism and anal
incontinence. The aim of our study was to establish normative data in a sufficiently large
group of healthy subjects, using a rigorously standardized examination technique. Methods:
Sixty-four subjects (aged 19–83 years) without pelvic or neurological disorders were
included. Motor unit potentials (MUPs)/interference pattern (IP) samples were obtained from …
evaluation of conus/cauda lesions, the differential diagnosis of parkinsonism and anal
incontinence. The aim of our study was to establish normative data in a sufficiently large
group of healthy subjects, using a rigorously standardized examination technique. Methods:
Sixty-four subjects (aged 19–83 years) without pelvic or neurological disorders were
included. Motor unit potentials (MUPs)/interference pattern (IP) samples were obtained from …
Objectives
Electromyography (EMG) of the external anal sphincter (EAS) is important in the evaluation of conus/cauda lesions, the differential diagnosis of parkinsonism and anal incontinence. The aim of our study was to establish normative data in a sufficiently large group of healthy subjects, using a rigorously standardized examination technique.
Methods
Sixty-four subjects (aged 19–83 years) without pelvic or neurological disorders were included. Motor unit potentials (MUPs)/interference pattern (IP) samples were obtained from the EAS using multi-MUP and turn/amplitude analyses, respectively. The effect of age, gender, parity, and constipation on MUP/IP parameters was studied. For MUP parameters the lower/upper limits for mean values, and ‘outlier’ limits, and for IP parameters normal ‘clouds’ were calculated.
Results
From 112 muscles 15–30 MUPs were sampled. As no effect of evaluated factors on mean values could be demonstrated, common reference values were calculated. Lower/higher limits for mean values were: amplitude 148/661 μV, duration 3.2/7.8 ms, area 87/625 μVms, and number of phases 2.3/3.7. ‘Outlier’ limits for individual MUPs were: amplitude 84/1315 μV, duration 1.6/13.8 ms, area 46/1222 μVms, number of phases 2/6. From 95 muscles 2706 IP samples were obtained.
Conclusions
The presented normative data should allow valid quantitative EMG of the EAS muscle in patients.
Elsevier
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