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Nerve Excitability Assessment in Chemotherapy-induced Neurotoxicity
07:42

Nerve Excitability Assessment in Chemotherapy-induced Neurotoxicity

Published on: April 26, 2012

Oxaliplatin-induced neurotoxicity and the development of neuropathy

Arun V Krishnan1, David Goldstein, Michael Friedlander

  • 1Institute of Neurological Sciences, Prince of Wales Hospital, Sydney, NSW, Australia.

Muscle & Nerve
|May 10, 2005
PubMed

Insights

Oxaliplatin chemotherapy can cause persistent nerve damage (neurotoxicity), affecting sensory nerves. This study found nerve excitability changes, suggesting voltage-gated sodium channel dysfunction, even after symptoms improve.

Area of Science:

  • Neuroscience
  • Clinical Neurology
  • Pharmacology

Background:

  • Oxaliplatin is a platinum-based chemotherapy agent used to treat colorectal cancer.
  • Oxaliplatin-induced neurotoxicity is a common and dose-limiting side effect, but its underlying mechanisms are not fully understood.
  • In vitro studies suggest voltage-gated sodium channels play a role in this neurotoxicity.

Purpose of the Study:

  • To investigate the pathophysiology of oxaliplatin-induced neurotoxicity in patients.
  • To correlate clinical symptoms with objective nerve function measures.
  • To explore the role of voltage-gated sodium channels in persistent neurotoxicity.

Main Methods:

  • Clinical assessment of neuropathic symptoms in 16 patients post-oxaliplatin therapy.
  • Nerve conduction studies (NCS) to evaluate sensory and motor nerve function.
  • Nerve excitability studies to assess axonal properties and refractoriness.
  • Longitudinal follow-up at 12 months.

Main Results:

  • 50% of patients experienced persistent chronic neuropathic symptoms.
  • Symptomatic patients showed significantly reduced sensory potentials on NCS, while motor studies were normal.
  • Nerve excitability studies revealed high-threshold axons and significantly increased refractoriness in symptomatic patients.
  • Cumulative oxaliplatin dose predicted neuropathy, with lower single-infusion doses potentially minimizing long-term effects.

Conclusions:

  • Oxaliplatin-induced neurotoxicity involves persistent abnormalities in sensory nerve conduction and excitability, even when positive sensory symptoms improve.
  • Increased refractoriness and high-threshold axons suggest dysfunction of voltage-gated transient sodium channels.
  • These findings support in vitro data implicating sodium channel dysfunction in oxaliplatin neurotoxicity pathophysiology.

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