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Positional nystagmus of central origin
Frederick E Cobb1, Lauren B Friedman
1Bay Pines VA Health Care System, Florida 33744, USA.
Journal of the American Academy of Audiology
|April 28, 2006
Summary
This case study highlights how specific test conditions in electronystagmography (ENG) are crucial for accurately localizing lesions. Repeated vestibular examinations confirmed initial findings in a patient with imbalance and hearing impairment.
Area of Science:
- Neurology
- Otolaryngology
Background:
- A 68-year-old male presented with imbalance and worsening word-recognition in the right ear.
- Audiometric tests revealed a known hearing impairment, while electrophysiologic and radiographic findings were also assessed.
Observation:
- Initial electronystagmography (ENG) showed mild ageotropic direction-changing positional nystagmus with eyes open and fixed.
- Click-evoked auditory brainstem response (ABR) waveforms were not repeatable.
- Brain MRI revealed diffuse ischemic white matter disease.
Findings:
- Repeated vestibular examination corroborated initial findings.
- The case underscores the importance of diagnostic protocol and repeated measures.
- Utilizing both visual fixation and nonfixation conditions in ENG subtests is vital for lesion localization.
Implications:
- Accurate lesion localization in vestibular disorders relies on meticulous adherence to diagnostic protocols.
- The study emphasizes the critical role of specific testing parameters, such as visual fixation, in electronystagmography.
- Understanding these nuances can improve diagnostic accuracy for patients with balance and hearing issues.