Journal of neurology · 2009
Ocular fixation instabilities in motor neurone disease. A marker of frontal lobe dysfunction?
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Donaghy Colette, Pinnock Ralph, Abrahams Sharon, Cardwell Chris, Hardiman Orla, Patterson Victor, McGivern R Canice, Gibson J Mark
Аннотация
OBJECTIVE: Eye movements are classically felt to be spared in motor neurone disease (MND). Although a range of ocular motor disorders have been reported, no consistent pattern has been established. Disturbances of ocular fixation have been noted in MND; however, fixation has not yet been formally examined. With the recent characterization of ocular fixation using saccadic intrusion amplitude and fixation periods, we performed a cross-sectional study to examine for abnormalities of ocular fixation in non-dementing patients with MND.
METHODS: A total of 44 patients and 45 controls were recruited. Fixation was examined using infra-red oculography and all subjects then underwent a neuropsychological evaluation.
RESULTS: Saccadic intrusion amplitude was found to be greater in patients compared to controls and in particular, spinal-onset patients. Saccadic intrusion amplitude in patients correlated with neuropsychological measures sensitive to lesions of the frontal lobes.
CONCLUSIONS: This is the first study to identify abnormalities of fixation in MND and these results indicate that ocular fixation instabilities may be a marker of the sub-clinical frontal lobe dysfunction in MND. A longitudinal study to examine if saccadic intrusion amplitude deteriorates with time would be of interest as this could provide a quantifiable objective marker of disease progression.
METHODS: A total of 44 patients and 45 controls were recruited. Fixation was examined using infra-red oculography and all subjects then underwent a neuropsychological evaluation.
RESULTS: Saccadic intrusion amplitude was found to be greater in patients compared to controls and in particular, spinal-onset patients. Saccadic intrusion amplitude in patients correlated with neuropsychological measures sensitive to lesions of the frontal lobes.
CONCLUSIONS: This is the first study to identify abnormalities of fixation in MND and these results indicate that ocular fixation instabilities may be a marker of the sub-clinical frontal lobe dysfunction in MND. A longitudinal study to examine if saccadic intrusion amplitude deteriorates with time would be of interest as this could provide a quantifiable objective marker of disease progression.