Ethanol-induced Vestibular Dysfunction as a Model for Bilateral Vestibular Syndrome.

Study Overview
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Brief Summary
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The purpose of the study is to create a vHIT- and VOG-model for bilateral vestibular neuronitis, via ethanol administration in healthy human subjects.

Detailed Description
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Ethanol administration has an effect on vestibular function, measurable with video head impulse test (vHIT)- and vestibulo-oculography (VOG)-methods. The purpose of the study is to create a vHIT- and VOG-model for bilateral vestibular neuronitis, a disease with difficult diagnostics, via ethanol administration in healthy human subjects. As subjects are consuming ethanol via oral route, vHIT-measurements and VOG-measurements (slow and rapid eye movement recordings) are being recorded in order to measure the change in vestibular function. During approx. 5 hours, 4 vHIT measurements will take place, while subjects ingest ethanol towards 1 per mille levels, measured via alcoholmeter. Necessary precautions include strict exclusion criteria regarding health of the subjects and also comprehensive preparedness for management of allergic reactions and other unusual phenomena related to alcohol consumption.

Official Title
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Ethanol-induced Vestibular Dysfunction as a Model for Bilateral Vestibular Syndrome: Similarities in VHIT and VOG Data.

Conditions
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vHIT- and VOG-model for Bilateral Vestibular Neuronitis

Intervention / Treatment
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* Other: Ethanol


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: no previous ear diseases normal hearing no signs of alcohol dependence (6 points or less in AUDIT-questionnaire) Exclusion Criteria: previous ear diseases abnormal hearing signs of alcohol dependence (7 points or more in AUDIT-questionnaire)

Ages Eligible for Study
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Minimum Age: 22 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Study subjects for vHIT- and VOG-measurements<br>Each study subject is his/hers own comparator at different phases of ethanol consumption. | Other: Ethanol<br>* Ethanol will be administered via oral route.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Ethanol-induced vestibular function decline as measured with vHIT-gain-value-measurements. | Video head impulse test measures the speed of eye movement as well as head movement (degrees per second, taken from 60 ms time interval from the beginning of head movement), the latter being produced by the investigator. The ratio of a sudden horizontal head movement and a rapid eye movement towards the opposite direction (as the subject is trying to fixate gaze straight ahead) is referred as gain value. With succeeding measurements during ethanol consumption, gain values will be recorded. The data contains vHIT gain -values at base level, without ethanol consumption, as well as during and after ethanol consumption. The most important tool in statistical analysis of the data is repeated measures analysis of variance (rm ANOVA). This allows each test subject to act as his/hers own control, as succeeding measurements are being compared to the base line values. The statistical significance will be set at the p< 0.05 level. | 5 hours or 1 work day | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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vHIT, vestibular neuronitis, VOG