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Electrooculography findings in Friedreich’s ataxia

M.P. Prim-Espada, J.I. De Diego-Sastre, A. Martínez-Salio, M.J. de Sarriá-Lucas [REV NEUROL 2005;40:78-80] PMID: 15712159 DOI: https://doi.org/10.33588/rn.4002.2004456

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Volumen 40 | Number 02 | Nº of views of the article 5.399 | Nº of PDF downloads 560 | Article publication date 16/01/2005

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ABSTRACT

INTRODUCTION Friedreich’s ataxia (FA) is the most frequent of the recessive hereditary ataxias. AIMS. Our aim was to analyse the findings from electrooculography studies in subjects with FA attended in our Service over a 30-year period.

PATIENTS AND METHODS Between the years 1970 and 1999, 51 patients with FA diagnosed in the Neurology Service of our hospital were examined. All of them were submitted to an electronystagmography study and an examination of the oculomotor system using electrooculography (EOG). In the EOG study, saccades, (square-wave) saccadic intrusions, spontaneous, triggered, positional and optokinetic nystagmus (OKN), visual suppression of the vestibulo-ocular reflex (VOR) and following were all evaluated.

RESULTS The disorders that were found most often were ataxic following (72.5%), abnormalities in rotational testing (56.8%) and dysmetria in the saccades (52.9%). The presence of square waves was observed in just over half the traces (52.9%).

CONCLUSIONS In FA the predominant EOG findings are those suggesting a cerebellar disease. KeywordsCerebellum Electrooculography Friedreich’s ataxia Nystagmus Square waves

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Original

Electrooculography findings in Friedreich’s ataxia