Rapid Eye Movements in Myasthenia Gravis: II. Electro-oculographic Analysis

Robert D. Yee, David G. Cogan, David Samuel Zee, Robert W. Baloh, Vicente Honrubia

Research output: Contribution to journalArticle

Abstract

Voluntary saccades were studied by electro-oculography in ten patients with myasthenia gravis (MG) and in eight patients with other types of ophthalmoplegia. Despite limited range of eye movements, maximum velocities of 20° and 40° saccades in patients with MG were not significantly different from those in normal individuals, whereas maximum velocities in patients with other types of ophthalmoplegia were significantly decreased. In some myasthenic patients, small amplitude saccades were hypermetric and had high velocities, appearing clinically as “quiver” movements characteristic of MG. In MG the preservation of saccades with high initial velocities, even in the presence of severe ophthalmoplegia, suggests that muscle fibers generating rapid movements during saccades (twitch fibers) can be relatively spared when muscle fibers responsible for maintenance of excentric gaze (tonic fibers) are severely affected.

Original languageEnglish (US)
Pages (from-to)1465-1472
Number of pages8
JournalArchives of Ophthalmology
Volume94
Issue number9
DOIs
StatePublished - 1976

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ASJC Scopus subject areas

  • Ophthalmology

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