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Reliability and comparison of gain values with occurrence of saccades in the video head impulse test (vHIT)

Presenting Author: Leise Hviid Korsager

Published online by Cambridge University Press:  03 June 2016

Leise Hviid Korsager ,
Jens Hoejberg Wanscher ,
Jesper Hvass Schmidt  and
Christian Faber
Leise Hviid Korsager
Affiliation:
Odense University Hospital
Jens Hoejberg Wanscher
Affiliation:
Department of ENT -Head & Neck Surgery, Odense University Hospital
Jesper Hvass Schmidt
Affiliation:
Department of Audiology, Odense University Hospital
Christian Faber
Affiliation:
Department of ENT -Head & Neck Surgery, Odense University Hospital
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Abstract

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Type
Abstracts
Information
The Journal of Laryngology & Otology , Volume 130 , Supplement S3: Abstracts for the 10th International Conference on Cholesteatoma , May 2016 , pp. S192
Copyright
Copyright © JLO (1984) Limited 2016 

Learning Objectives:

Introduction: The vHIT investigates the vestibular function in two ways: a VOR (vestibulo-ocular reflex) gain value and a graphical representation of VOR. Interpreting patient's vestibular function based on vHIT depends on both parameters, but more information about the reliability of the two parameters is needed.

The objective was to investigate the reliability of vHIT by comparing gain values between examiners on the same subjects and to see how differences affected the occurrence of saccades.

Method: Thirty subjects who had undergone cochlear implant (CI) surgery, were tested with video head impulse test (EyeSeeCam from Interacoustics). Four different examiners, all experienced with vHIT, tested the subjects.

Two judges interpreted the graphical representation of VOR according to occurrence of saccades or not.

Results: Differences in gain values amongst examiners varied from 0.2–0.58 with an average of 0.14 (95% CI 0.12–0.16) on the right ear and 0.17 (95% CI 0.15–0.19) on the left ear. Occurrences of saccades on the same patient were reproduced in 93% of the cases by all examiners. Interclass correlation coefficient (ICC) of the gain values between two examiners was 0.62. Kappa's coefficient was calculated upon the interpretation of the graphical outcome to 0.83.

Conclusion: The gain value seems to be less reliable than the graphical occurrence of saccades in the judgement of VOR. Interpretation of vHIT results should therefore not depend on the gain value alone but should depend on both gain value and the occurrence of saccades.