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Related Experiment Video

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Sensory axonal dysfunction in cervical radiculopathy.

Jia-Ying Sung1, Jowy Tani2, Kuo-Sheng Hung3

  • 1Department of Neurology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan Department of Neurology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.

Journal of Neurology, Neurosurgery, and Psychiatry
|August 22, 2014
PubMed
Summary
This summary is machine-generated.

Cervical radiculopathy patients show distal nerve axonal hyperpolarization, detectable by nerve excitability testing. This suggests potential overactivation of Na(+)-K(+) ATPase or remyelination, offering a sensitive diagnostic marker.

Keywords:
Electrical StimulationNeurophysiologyNeurosurgery

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Area of Science:

  • Neurology
  • Neurophysiology

Background:

  • Cervical radiculopathy involves nerve root compression in the neck.
  • Conventional nerve conduction studies (NCS) may not always detect subtle axonal changes.

Purpose of the Study:

  • To evaluate sensory axonal excitability changes in the distal nerve of patients with cervical radiculopathy.
  • To compare nerve excitability testing with NCS in detecting these changes.

Main Methods:

  • Patients with cervical radiculopathy (C6/7 or higher root compression) underwent nerve excitability testing and NCS.
  • Sensory nerve excitability was assessed by stimulating the wrist and recording from digit II.
  • Tests were performed pre- and post-surgery in some patients and compared to healthy controls.

Main Results:

  • Patients exhibited altered sensory axonal excitability, including prolonged strength-duration time constant and increased threshold electrotonus hyperpolarisation (TEh).
  • These changes indicate axonal membrane hyperpolarisation.
  • Postoperative testing revealed significant changes in TEh, suggesting a dynamic process.

Conclusions:

  • Distal nerve axonal hyperpolarisation is present in cervical radiculopathy.
  • This pattern may result from Na(+)-K(+) ATPase overactivation due to ischemia or reflect remyelination.
  • Nerve excitability testing appears more sensitive than NCS for detecting clinical symptoms in cervical radiculopathy.