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Related Experiment Videos

Thoracic spinal nerve and root conduction: a magnetic stimulation study

S Chokroverty1, A Deutsch, C Guha

  • 1Neurology Service, VA Medical Center, Lyons, New Jersey, USA.

Muscle & Nerve
|September 1, 1995
PubMed
Summary
This summary is machine-generated.

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This study introduces magnetic coil (MC) stimulation for thoracic spinal nerves. The technique accurately identifies nerve conduction, aiding in diagnosing conditions like diabetic radiculoneuropathy.

Area of Science:

  • Neurology
  • Biophysics
  • Medical Imaging

Background:

  • Assessing thoracic spinal nerve and root function is crucial for diagnosing neurological disorders.
  • Non-invasive electrophysiological methods are needed for precise localization of nerve conduction.
  • Magnetic coil (MC) stimulation offers a potential non-invasive approach.

Purpose of the Study:

  • To describe and validate a magnetic coil (MC) stimulation technique for thoracic spinal nerves and roots.
  • To assess the reliability and localization accuracy of MC stimulation in normal subjects.
  • To evaluate the utility of MC stimulation in diagnosing radiculoneuropathy in a patient with diabetes mellitus.

Main Methods:

  • Magnetic coil (MC) stimulation was applied over the T-7, T-8, and T-9 spinous processes in 12 healthy individuals and one patient with diabetes mellitus.

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  • Compound muscle action potentials were recorded from the upper rectus abdominis, external oblique, and intercostal muscles.
  • Stimulation intensity and coil position were varied to assess latency consistency and localization.

    • Main Results:

    • Consistent onset latencies were observed across varying stimulation intensities (30-100%) and slight lateral coil displacements (up to 3 cm).
    • This suggests stimulation occurred at a fixed site, likely the intervertebral foramina, targeting the fastest conducting nerve fibers.
    • The diabetic patient exhibited prolonged latencies, consistent with a diagnosis of radiculoneuropathy.

    Conclusions:

    • Magnetic coil (MC) stimulation is a reliable technique for assessing thoracic spinal nerve and root conduction.
    • The method demonstrates high localization accuracy, likely stimulating at the intervertebral foramina.
    • MC stimulation is a valuable tool for diagnosing peripheral neuropathies, such as diabetic radiculoneuropathy.