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Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
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Local anesthetics (LAs) block the sodium channels of nerve trunks, sensory nerve endings, and neuromuscular junctions. Although LAs can block all kinds of nerves, the sensitivity of nerve fibers differs according to nerve types and structures. LAs are known to block myelinated fibers faster than unmyelinated ones. Also, they block pain or sensory neurons at low concentrations without affecting the motor neurons involved in muscle contractions. This helps relieve labor pain without affecting the...
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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Related Experiment Video

Updated: Jul 12, 2025

Use of In Vivo Single-fiber Recording and Intact Dorsal Root Ganglion with Attached Sciatic Nerve to Examine the Mechanism of Conduction Failure
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Provocative changes in nerve conductions: Fact or fiction?

Lawrence R Robinson1

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Performing electrodiagnostic studies in provocative positions does not improve diagnosis for nerve conditions. Studies show no reproducible nerve conduction changes, and rapid reversibility is physiologically implausible.

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Area of Science:

  • Neuroscience
  • Clinical Electrophysiology

Background:

  • Electrodiagnostic medical consultants (EMCs) sometimes perform nerve conduction studies in both neutral and provocative positions.
  • This approach aims to identify electrophysiologic changes that may exacerbate symptoms, especially when standard tests are inconclusive.

Purpose of the Study:

  • To evaluate the diagnostic value of performing nerve conduction studies in provocative or symptomatic positions.

Main Methods:

  • Review of studies investigating nerve conduction in provocative positions for conditions like median neuropathy, thoracic outlet syndrome, piriformis syndrome, and radial tunnel syndrome.
  • Assessment of the pathophysiological plausibility for rapid, reversible electrophysiologic changes due to positional compression.

Main Results:

  • Empiric studies have failed to demonstrate reproducible changes in nerve conduction studies in provocative positions across several conditions.
  • There is a lack of plausible pathophysiological mechanisms for rapid, reversible electrophysiologic changes from short-duration positional compression.
  • Nerve movement with joint position changes can lead to misleading results in nerve conduction studies.

Conclusions:

  • Testing nerve conduction in provocative or symptomatic positions does not add value to electrodiagnostic testing.
  • Standard electrodiagnostic testing in neutral positions is sufficient for diagnosing nerve entrapment and related disorders.