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Related Experiment Videos

Cervical nerve root stimulation. Part I: technical aspects and normal data.

Steve Vucic1, Kevin D Cairns, Kristin R Black

  • 1Department of Neurology, Massachusetts General Hospital, 55 Fruit Street, Boston, GRB 1256 Boston, MA 02114, USA.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|January 13, 2006
PubMed
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This study establishes normal values for cervical nerve root stimulation (CRS) in healthy individuals, finding it a well-tolerated technique for assessing upper extremity motor axons. The established normative data aids in diagnosing proximal conduction abnormalities.

Area of Science:

  • Neurology
  • Neurophysiology
  • Clinical Electrophysiology

Background:

  • Cervical nerve root stimulation (CRS) assesses proximal motor axons to upper extremity muscles.
  • Normative values for CRS are sparsely reported in existing literature.
  • Understanding normal electrophysiological parameters is crucial for diagnosing neurological disorders.

Purpose of the Study:

  • Determine normative values for Compound Muscle Action Potential (CMAP) onset-latencies and changes in amplitude, area, and duration in healthy controls.
  • Evaluate the tolerability of the CRS technique using the Visual Analog Scale (VAS).
  • Establish reference data for needle CRS in assessing proximal conduction abnormalities.

Main Methods:

  • Prospective study of 21 healthy volunteers.

Related Experiment Videos

  • CRS performed on abductor pollicis brevis (APB), abductor digiti minimi (ADM), biceps, and triceps muscles bilaterally.
  • Collision studies utilized for all APB recordings; VAS assessed for tolerability.

    • Main Results:

    • Mean CMAP onset-latencies established for APB (14 ms), ADM (14.2 ms), biceps (5.4 ms), and triceps (5.4 ms).
    • Onset-latency showed a significant correlation with subject height.
    • CMAP amplitude and area showed variable changes, while duration generally increased with CRS compared to distal stimulation.

    Conclusions:

    • The study successfully established normative electrophysiological data for CRS.
    • CRS is demonstrated to be a well-tolerated and valuable technique for clinical neurophysiological assessment.
    • These normative values serve as a reference for diagnosing proximal conduction deficits.