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Percutaneous S1 root somatosensory evoked potential

C R Bamford1, K Graeme

  • 1Department of Neurology, College of Medicine, University of Arizona, Tucson 85724, USA.

Electromyography and Clinical Neurophysiology
|April 1, 1995
PubMed
Summary

This study demonstrates that stimulating the first sacral root via the dorsal sacral foramen yields a high-amplitude spinal response. However, cortical evoked potentials were inconsistently recorded, showing variable latencies and amplitudes.

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Area of Science:

  • Neuroscience
  • Electrophysiology

Background:

  • Evoked potentials are crucial for assessing neural pathway integrity.
  • Percutaneous stimulation offers a minimally invasive approach to nerve root evaluation.

Purpose of the Study:

  • To investigate the feasibility of recording spinal and cortical evoked potentials from the first sacral root.
  • To characterize the electrophysiological responses following percutaneous stimulation of the S1 root.

Main Methods:

  • Spinal and cortical evoked potentials were recorded.
  • Percutaneous stimulation of the first sacral root was performed via the dorsal sacral foramen.
  • Surface electrodes were utilized for signal acquisition.

Main Results:

  • A high-amplitude spinal response was consistently and easily recorded.
  • Cortical responses were inconsistently elicited.
  • Cortical responses exhibited significant variability in latency, amplitude, and morphology.

Conclusions:

  • Percutaneous stimulation of the first sacral root provides a reliable method for recording spinal evoked potentials.
  • The inconsistent elicitation and high variability of cortical evoked potentials suggest challenges in their clinical application for S1 root assessment.

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