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Extraocular muscles are spared in advanced Duchenne dystrophy.
H J Kaminski1, M al-Hakim, R J Leigh
1Department of Neurology, Department of Veterans Affairs Medical Center, Cleveland, OH 44106.
Annals of Neurology
|October 1, 1992
Summary
Saccadic eye movement velocities were normal in patients with Duchenne's or Becker's muscular dystrophy, suggesting extraocular muscles are protected from degeneration.
Area of Science:
- Neurology
- Ophthalmology
- Muscular Dystrophy Research
Background:
- Duchenne's and Becker's muscular dystrophy primarily affect fast-twitch extremity muscle fibers.
- Saccades, rapid eye movements, are typically mediated by fast-twitch fibers.
- A decrease in saccadic velocity was hypothesized in patients with these muscular dystrophies.
Purpose of the Study:
- To investigate ocular motility in patients with Duchenne's and Becker's muscular dystrophy.
- To determine if saccadic velocities are affected in advanced stages of these conditions.
- To assess the integrity of extraocular muscle function.
Main Methods:
- Infrared oculography was utilized to measure saccadic peak velocities.
- The study included 3 patients with advanced Duchenne's or Becker's muscular dystrophy.
- Clinical assessments were performed on an additional 7 patients.
Main Results:
- Peak velocities of saccades in patients with advanced Duchenne's or Becker's muscular dystrophy were found to be normal.
- Clinical examinations of other patients with these dystrophies also yielded normal findings.
- This is the first study to examine ocular motility in these conditions.
Conclusions:
- Extraocular muscle function is preserved in Duchenne's and Becker's muscular dystrophy.
- Fast-twitch fibers in extraocular muscles may possess protective properties against degeneration.
- Ocular motility remains intact despite peripheral muscle fiber degeneration.