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Superior oblique myokymia. Quantitative characteristics of the eye movements in three patients.
Leigh, R J; Tomsak, R L; Seidman, S H; Dell'Osso, L F.
Afiliação
  • Leigh RJ; Department of Neurology, Case Western Reserve University, Cleveland, OH.
Arch Ophthalmol ; 109(12): 1710-3, 1991 Dec.
Article em En | MEDLINE | ID: mdl-1841582
ABSTRACT
Using the magnetic search coil technique, we measured horizontal, vertical, and torsional rotations of both eyes of two patients with idiopathic superior oblique myokymia, and of the affected eye in a third patient. Superior oblique myokymia was strictly monocular and consisted of an initial intorsion and depression of the affected eye and subsequent oscillations with torsional and vertical components. The peak-to-peak torsional and vertical amplitudes of the oscillations were less than 1 degree, but peak velocities frequently exceeded 4 degrees/sec in both planes. Fourier analysis indicated two features (1) a broad range of frequencies up to about 50 Hz, indicating irregular oscillations; and (2) a superimposed larger-amplitude oscillation in the range from 1.5 to 6 Hz. Taken with electromyographic data from other studies, these results indicate that superior oblique myokymia reflects spontaneous discharge of trochlear motor neurons that have undergone regenerative changes.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Transtornos da Motilidade Ocular / Fasciculação Tipo de estudo: Etiology_studies Limite: Adult / Aged / Female / Humans / Male / Middle aged Idioma: En Revista: Arch Ophthalmol Ano de publicação: 1991 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Transtornos da Motilidade Ocular / Fasciculação Tipo de estudo: Etiology_studies Limite: Adult / Aged / Female / Humans / Male / Middle aged Idioma: En Revista: Arch Ophthalmol Ano de publicação: 1991 Tipo de documento: Article