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Evaluating vestibulo-ocular reflex gain characteristics with monocular video head impulse test across different age groups in a healthy population.

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Related Experiment Video

Updated: May 27, 2025

Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
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Microsaccades during video head impulse test in normal subjects.

Mingwei Xu1,2,3, Qin Zhang1,2,3, Yuan Yao1,2,3

  • 1Department of Otorhinolaryngology-Head & Neck Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China.

Journal of Vestibular Research : Equilibrium & Orientation
|February 17, 2025
PubMed
Summary

Healthy individuals exhibit distinct microsaccades during video head impulse testing (vHIT), differing from those in vestibular neuritis patients. Careful interpretation of these saccades is crucial for accurate clinical assessment.

Keywords:
PR scorecatch-up saccadescompensatory saccadessaccades analysisvestibular neuritisvestibular-ocular reflex (VOR)video head impulse test (vHIT)

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Audiology

Background:

  • The video head impulse test (vHIT) is essential for assessing vestibular function.
  • Understanding saccade characteristics in healthy individuals is key to interpreting vHIT results in patients with vestibular disorders.

Purpose of the Study:

  • To quantitatively analyze saccade characteristics in healthy subjects during vHIT.
  • To establish a normative reference for saccade parameters in clinical vHIT practice.
  • To differentiate saccades in healthy individuals from those in patients with vestibular neuritis (VN).

Main Methods:

  • A cohort of 20 healthy individuals and 20 VN patients were evaluated using vHIT.
  • Quantitative analysis of saccade characteristics (frequency, latency, peak velocity, duration) for lateral and vertical semicircular canals (SCCs).
  • Comparison of saccade parameters between healthy subjects and VN patients, controlling for age.

Main Results:

  • Significant differences in saccade frequency, latency, peak velocity, and duration were found between healthy subjects and VN patients for both lateral and vertical SCCs (p < 0.05).
  • No significant differences in Perez-Rey (PR) scores were observed between the groups for either lateral or vertical SCCs.
  • Within the healthy group, significant variations in saccade frequency, peak velocity, and duration were noted across different SCCs, but latency and PR scores remained consistent.

Conclusions:

  • Microsaccades with prolonged latency and reduced amplitude can be present in healthy individuals during vHIT.
  • These saccades in healthy individuals are distinct from those observed in VN patients, indicating vestibular impairment.
  • Accurate identification and interpretation of saccades during vHIT are critical for reliable clinical diagnosis.