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Related Experiment Videos

Motor evoked potentials from the pelvic floor.

Søren Brostrøm1

  • 1Department of Obstetrics & Gynecology, Glostrup County Hospital, University of Copenhagen, Denmark. soren@brostrom.dk

Neurourology and Urodynamics
|November 5, 2003
PubMed
Summary

Pelvic floor motor evoked potentials (MEPs) show high variability and poor reproducibility in healthy women and those with multiple sclerosis (MS), limiting their clinical diagnostic value.

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Area of Science:

  • Neuroscience
  • Urology
  • Clinical Neurophysiology

Background:

  • Lower urinary tract dysfunction (LUTD) is common, often without clear neurological cause.
  • Identifying neurogenic causes in LUTD requires advanced diagnostic tools.
  • Transcranial magnetic stimulation (TMS) can assess pelvic floor efferent pathways.

Purpose of the Study:

  • Establish normative values for pelvic floor motor evoked potentials (MEPs).
  • Evaluate the methodological clarity and reproducibility of pelvic floor MEP testing.
  • Investigate MEPs in women with and without multiple sclerosis (MS).

Main Methods:

  • Pelvic floor MEPs were recorded in 30 healthy women and 16 women with MS.
  • Various stimulus and recording techniques were tested in healthy controls.
  • Reproducibility was assessed by retesting 18 healthy women.
  • Women with MS also underwent urodynamic studies.

Main Results:

  • Invasive needle electrodes were superior to surface electrodes for MEP recording.
  • Significant methodological challenges and high response variability were observed.
  • Poor long-term reproducibility of pelvic floor MEP latencies was noted.
  • Women with MS showed prolonged central conduction times and frequent unevokable responses.
  • MEPs correlated poorly with urodynamic findings in MS patients.

Conclusions:

  • Pelvic floor MEP testing has limited clinical utility due to inherent limitations.
  • High variability and occasional unevokable responses necessitate cautious interpretation.
  • Further research is needed to control and explain response variability for potential scientific insights.

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