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Related Experiment Videos

Saccade dynamics in peripheral vs central sixth nerve palsies.

Agnes M F Wong1, Kylen McReelis, James A Sharpe

  • 1Department of Ophthalmology and Vision Sciences, University Health Network, University of Toronto, Ontario, Canada. agnes.wong@utoronto.ca

Neurology
|May 10, 2006
PubMed
Summary

Peripheral and central sixth nerve palsies show different recovery patterns. While acute palsies impair saccade velocity, chronic peripheral palsies recover, unlike chronic central palsies, suggesting varied nerve regeneration.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Neurology

Background:

  • Sixth nerve palsy (abducens nerve palsy) affects eye movement control.
  • Differentiating peripheral (idiopathic, ischemic) from central (brainstem) causes is crucial for prognosis.
  • Saccade analysis offers a quantitative method to assess nerve function recovery.

Purpose of the Study:

  • To compare saccade velocities and durations in acute and chronic peripheral versus central sixth nerve palsies.
  • To elucidate the underlying mechanisms of recovery or lack thereof in different types of sixth nerve palsy.

Main Methods:

  • Studied patients with unilateral incomplete sixth nerve palsies (peripheral and central) and healthy controls.
  • Categorized palsies as acute (<1 month) or chronic (>1 month).

Related Experiment Videos

  • Measured horizontal saccade peak velocities and durations using search coils in +/- 10 deg excursions.

    • Main Results:

    • Both acute peripheral and central palsies showed reduced abducting saccade velocities in the paretic eye.
    • Chronic central palsies maintained reduced abducting saccade velocities.
    • Chronic peripheral palsies demonstrated normalized saccade velocities within 2 months, despite persistent abduction deficits.

    Conclusions:

    • Acute peripheral and central sixth nerve palsies similarly prolong saccade duration and reduce peak velocity.
    • Reduced saccade speeds in chronic central palsies indicate limited neural regeneration within the brainstem.
    • Saccade speed recovery in chronic peripheral palsies suggests successful remyelination, axonal regeneration, or central adaptation mechanisms.