Vertigo
Conditions
Keywords
Vestibular Function Tests, Caloric Test, Electronystagmography, Prediction
Brief summary
The alternate binaural bithermal caloric test (ABBT) is a well established examination in the evaluation of the dizzy patient. ABBT is useful in detecting the side of peripheral vestibulopathy by stimulating each ear separately, it contributes to the diagnosis of bilateral vestibular involvement when all responses to cold and warm stimuli are reduced, and adds to the differentiation of peripheral from central vestibular involvement by measuring the fixation-induced inhibition of the caloric response. In spite of these benefits, ABBT is the most time-consuming part of the electronystagmography/Videonystagmography (ENG/VNG) test battery, and frequently causes significant inconvenience to the patient due to the repeated extreme vestibular stimuli. The head impulse test (HIT) assesses vestibular function by brisk, passive rotations of the head in the plane of the examined semicircular canals. Whenever the vestibulo-ocular reflex (VOR) is deficient, this maneuver would produce catch-up saccades aiming to the re-fixation of the eyes on the target. Hence, both residual VOR and catch-up saccades act synergistically to stabilize gaze. The HIT requires only several minutes and might cause minimal discomfort only. The study hypothesis is that the HIT recorded by standard VNG equipment of the VNG system would provide diagnostic information on the side of vestibular involvement matching that of the ABBT.
Interventions
OTHERVideo recording of Head Impulse Test
Video recording of Head Impulse Test
Sponsors
Clalit Health Services, Haifa and West Galilee
Meir Medical Center
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Age \> 18 years * Videonystagmography(VNG) test battery is indicated for the diagnosis of dizziness or vertigo
Exclusion criteria
* Signs of retrocochlear lesion or central vestibular pathology in bed-side otoneurological examination or audiometry or ENG/VNG * Age \< 18 years * Otitis externa * Otitis media * Tympanic membrane perforation * Status Post Mastoidectomy * Limitations of neck movements in the horizontal plain
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Sensitivity of the recorded HIT results in the prediction of the caloric test lateralization parameter | 18 months | Sensitivity would be calculated according to the following formula: Number of participants in whom catch-up saccades would be recorded and caloric test lateralization would be greater than 25% divided by the sum of number of participants in whom catch-up saccades would be recorded and caloric test lateralization would be greater than 25% plus the number of participants in whom no catch-up saccades would be recorded and caloric test lateralization would be greater than 25% (number of true positives /(number of true positives + number of false negatives)) |
| Specificity of the VNG recorded HIT results in the prediction of the caloric test lateralization parameter | 18 months | Specificity would be calculated according to the following formula: Number of participants in whom no catch-up saccades would be recorded and caloric test lateralization would be smaller than 25% divided by the sum of number of participants in whom no catch-up saccades would be recorded and caloric test lateralization would be smaller than 25% plus the number of participants in whom catch-up saccades would be recorded and caloric test lateralization would be smaller than 25% (number of true negatives /(number of true negatives + number of false positives)) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Sensitivity of the bed-side HIT examination results in the prediction of the caloric test lateralization parameter | 18 months | Sensitivity = Number of participants in whom catch-up saccades would be diagnosed in the HIT bed-side examination and caloric test lateralization would be greater than 25% divided by the sum of number of participants in whom catch-up saccades would be diagnosed in the HIT bed-side examination and caloric test lateralization would be greater than 25% plus the number of participants in whom no catch-up saccades would be diagnosed and caloric test lateralization would be greater than 25% (number of true positives /(number of true positives +number of false negatives)) |
| Specificity of the bed-side HIT examination results in the prediction of the caloric test lateralization parameter | 18 months | Specificity would be calculated according to the following formula: Number of participants with no catch-up saccades in the HIT bed-side examination and caloric test lateralization smaller than 25% divided by the sum of number of participants in with catch-up saccades in the HIT bed-side examination and caloric test lateralization smaller than 25% plus the number of participants with catch-up saccades in the HIT bed-side examination and caloric test lateralization smaller than 25% (number of true negatives /(number of true negatives + number of false positives)) |
Countries
Israel
Outcome results
None listed