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Thoracodorsal nerve conduction study

P B Wu1, T Robinson, W S Kingery

  • 1Department of Functional Restoration, Stanford University Medical Center, California 94305, USA.

American Journal of Physical Medicine & Rehabilitation
|August 26, 1998
PubMed
Summary
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This study establishes the first nerve conduction study for the thoracodorsal nerve, providing crucial reference values. These findings aid in evaluating thoracodorsal nerve integrity and diagnosing brachial plexus injuries.

Area of Science:

  • Neurology
  • Neurophysiology
  • Clinical Electrophysiology

Background:

  • The thoracodorsal nerve's electrodiagnostic assessment is not well-established in existing literature.
  • Accurate assessment of the thoracodorsal nerve is vital for diagnosing and managing brachial plexus injuries.

Purpose of the Study:

  • To describe and validate a nerve conduction study (NCS) protocol for the thoracodorsal nerve.
  • To establish normative electrophysiological values for the thoracodorsal nerve in healthy adults.

Main Methods:

  • Nerve conduction studies were performed on 30 healthy adults (16 males, mean age 41.5 years).
  • The thoracodorsal nerve was stimulated at the axilla and Erb's point, with recording over the latissimus dorsi muscle.
  • Key parameters measured included sensory and motor nerve conduction velocities and compound muscle action potential amplitudes.

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Main Results:

  • Mean latencies were 1.9 ms (axillary stimulation) and 3.6 ms (Erb's point stimulation).
  • Mean compound muscle action potential amplitudes were 4.1 mV (right) and 3.9 mV (left).
  • The compound muscle action potential ratio was 0.8 +/- 0.12.

Conclusions:

  • This study presents the first described nerve conduction study for the thoracodorsal nerve.
  • The established normative data are essential for evaluating thoracodorsal nerve function.
  • This methodology will assist in the diagnosis and prognosis of brachial plexus injuries affecting this nerve.