VOR gain calculation methods in video head impulse recordings.
J Vestib Res
; 30(4): 225-234, 2020.
Article
en En
| MEDLINE
| ID: mdl-32804110
ABSTRACT
BACKGROUND:
International consensus on best practices for calculating and reporting vestibular function is lacking. Quantitative vestibulo-ocular reflex (VOR) gain using a video head impulse test (HIT) device can be calculated by various methods.OBJECTIVE:
To compare different gain calculation methods and to analyze interactions between artifacts and calculation methods.METHODS:
We analyzed 1300 horizontal HIT traces from 26 patients with acute vestibular syndrome and calculated the ratio between eye and head velocity at specific time points (40âms, 60âms) after HIT onset ('velocity gain'), ratio of velocity slopes ('regression gain'), and ratio of area under the curves after de-saccading ('position gain').RESULTS:
There was no mean difference between gain at 60âms and position gain, both showing a significant correlation (r2â=â0.77, pâ<â0.001) for artifact-free recordings. All artifacts reduced high, normal-range gains modestly (range -0.06 to -0.11). The impact on abnormal, low gains was variable (depending on the artifact type) compared to artifact-free recordings.CONCLUSIONS:
There is no clear superiority of a single gain calculation method for video HIT testing. Artifacts cause small but significant reductions of measured VOR gains in HITs with higher, normal-range gains, regardless of calculation method. Artifacts in abnormal HITs with low gain increased measurement noise. A larger number of HITs should be performed to confirm abnormal results, regardless of calculation method.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Grabación en Video
/
Reflejo Vestibuloocular
/
Enfermedades Vestibulares
/
Artefactos
/
Prueba de Impulso Cefálico
Tipo de estudio:
Clinical_trials
/
Guideline
/
Observational_studies
/
Prevalence_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Humans
Idioma:
En
Revista:
J Vestib Res
Asunto de la revista:
OTORRINOLARINGOLOGIA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Suiza