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Ann Clin Neurophysiol > Volume 21(2); 2019 > Article
CASE REPORT
Ann Clin Neurophysiol. 2019; 21(2): 94-97.
Published online July 31, 2019.
doi: https://doi.org/10.14253/acn.2019.21.2.94
Selective impairment of the rapid eye movements in myotonic dystrophy
Sung-Hee Kim  , and Jin-Sung Park 
Department of Neurology, Kyungpook National University Chilgok Hospital, School of Medicine, Kyungpook National University, Daegu, Korea
Corresponding Author: Sung-Hee Kim ,Tel: +82-53-200-2168, Fax: +82-53-200-2029, Email: lossheaven9@gmail.com
Received August 10, 2018   Revised: September 27, 2018    Accepted October 26, 2018
ABSTRACT
The patients with myotonic dystrophy (MD) show ocular motor abnormalities including strabismus, vergence deficits, and inaccurate or slow saccades. Two theories have been proposed to explain the oculomotor deficits in MD. The central theory attributes the defects of eye movements of MD to the involvement of the central nervous system while the muscular theory attributes to dystrophic changes of the extraocular muscles. A 58-year-old woman with MD showed selective slowing of horizontal saccades and reduced peak velocities for both horizontal canals in head impulse tests, while smooth-pursuit eye movements and vertical head impulse responses were normal. This case suggests that the extraocular muscles-as a final common pathway of the voluntary saccade and reflexive vestibular eye movements-may better explain the defective rapid eye movements observed in MD.
Key words: Head impulse test; Myotonic dystrophy; Saccades
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