Normal Vestibulo Ocular Reflex (VOR) gain Measured Using the Video Head Impulse Test (vHIT) in Healthy Young Adults
- Author:
Jamaluddin SA
- Collective Name:Omar NA
- Publication Type:Journal Article
- Keywords:
Video Head ImpulseTest, Vestibulo-ocular reflex, Semicircular canal, Saccades, Vertigo.
- From:
The International Medical Journal Malaysia
2019;18(3):88-94
- CountryMalaysia
- Language:English
-
Abstract:
Introduction: Many new objective tests to assess the function of specific structures of the vestibular
organ are currently adopted in vestibular clinics. One of the objective assessments include the video head
impulse test (vHIT) where gain & velocity responses of eye relative to the head movements are recorded
using an infrared camera. Methods: Thirty normal hearing subjects age between 18 to 25 years old
participated in this study. At least ten Lateral, Left Anterior Right Posterior (LARP), and Right Anterior Left
Posterior (RALP) responses were recorded for each participant by making small and rapid unpredictable head
movements. Results: The average velocity gain for Lateral responses at 40 ms, 60 ms and 80 ms were 1.05 ±
0.003, 1.03 ± 0.002 and 1.01 ± 0.003 respectively. The LARP average velocity regression were 1.01 ± 0.24 for
Left Anterior and 1.05 ± 0.25 for Right Posterior, with an average gain asymmetry of 5.13%. The RALP
average velocity regression were 1.08 ± 0.31 for Right Anterior and 1.12 ± 0.30 for Left Posterior, with an
average gain asymmetry of 5.87%. One sample T-test were conducted to compare Lateral responses to a
previous study by Mossman et al. (2015) where significant differences in velocity gain at 60 ms and 80 ms
between studies were found where, t (59) = 5.56, p <0.01 and t (59) = 2.86, p < 0.01 respectively.
Conclusion: This indicates the importance of establishing on-site norms for every clinical settings as
techniques used and equipment differences could affect the results.
- Full text:180311.pdf
