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Visually induced eye movements in Wallenberg's syndrome
R Kanayama1, T Nakamura, M Ohki
1Department of Otolaryngology, Yamagata University School of Medicine, Japan.
Acta Oto-Laryngologica. Supplementum
|January 1, 1991
Summary
Wallenberg's syndrome patients often exhibit impaired visually induced eye movements, specifically in optokinetic nystagmus (OKN) slow-phase velocities. Lesion location, whether medulla or medulla and cerebellum, correlates with specific patterns of OKN impairment.
Area of Science:
- Neuroscience
- Ophthalmology
- Neurology
Background:
- Wallenberg's syndrome, a rare neurological condition, results from brainstem infarction.
- Visually induced eye movements are crucial for assessing neurological function.
Purpose of the Study:
- To investigate visually induced eye movements in patients with Wallenberg's syndrome.
- To correlate eye movement abnormalities with lesion localization.
Main Methods:
- Quantitative analysis of eye movements, including optokinetic nystagmus (OKN) and smooth pursuit, in 18 patients.
- Assessment of visual suppression of caloric nystagmus.
- Correlation of findings with CT and MRI imaging.
Main Results:
- 16 out of 18 patients showed impaired OKN slow-phase velocities.
- Two distinct patterns of OKN impairment were observed, correlating with lesion location (medulla vs. medulla and cerebellum).
- Reduced visual suppression of caloric nystagmus was common, particularly towards the lesion side.
Conclusions:
- Visually induced eye movement analysis is valuable for diagnosing and localizing lesions in Wallenberg's syndrome.
- MRI is superior to CT for detecting brainstem and cerebellar infarctions in these patients.