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Vestibular evoked myogenic potentials in delayed endolymphatic hydrops.
Yi-Ho Young1, Tsung-Wei Huang, Po-Wen Cheng
1Department of Otolaryngology, National Taiwan University Hospital, Taipei. youngyh@ha.mc.ntu.edu.tw
The Laryngoscope
|September 28, 2002
Summary
Vestibular evoked myogenic potential (VEMP) tests can help predict delayed endolymphatic hydrops. Abnormal VEMP or caloric test results in patients with sudden deafness may indicate future hydrops development.
Area of Science:
- Otolaryngology
- Neuroscience
- Audiology
Background:
- Vestibular evoked myogenic potential (VEMP) is an established test for the sacculo-collic reflex.
- Delayed endolymphatic hydrops is characterized by saccular dilation observed in histopathology.
Purpose of the Study:
- To investigate VEMP characteristics in patients with delayed endolymphatic hydrops.
- To assess the utility of VEMP and caloric testing in predicting delayed endolymphatic hydrops.
Main Methods:
- A prospective study involving 20 patients with delayed endolymphatic hydrops.
- Patients underwent pure-tone audiometry, caloric testing, and VEMP testing.
- Delayed VEMP defined by specific peak latencies; augmented/depressed VEMP by interaural amplitude difference.
Main Results:
- 45% of patients had normal VEMPs, 30% absent VEMPs, and 25% abnormal VEMPs (delayed, depressed, augmented).
- Caloric testing showed abnormalities in 10 of 19 ears (canal paresis or absent response).
- No overlap was found between absent caloric response and absent VEMPs.
Conclusions:
- Residual saccular and caloric function may influence the development of delayed endolymphatic hydrops.
- Caloric testing and VEMP testing are recommended for patients with sudden deafness or juvenile unilateral total deafness to predict future delayed endolymphatic hydrops.