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Related Concept Videos

Impulse01:13

Impulse

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According to Newton’s second law of motion, the rate of change of the momentum of an object is the net external force acting on it. The total change in momentum between two timepoints thus depends on both the external force acting on it and the time over which it acts. Describing this mathematically, the total change of an object’s motion is proportional to the force vector and the time over which it is applied. This product is called impulse.
Additionally, it can be shown that the...
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Related Experiment Video

Updated: Apr 20, 2026

Testing of all Six Semicircular Canals with Video Head Impulse Test Systems
08:38

Testing of all Six Semicircular Canals with Video Head Impulse Test Systems

Published on: April 18, 2019

33.6K

The video head impulse test.

Pedro Luiz Mangabeira Albernaz1, Francisco Carlos Zuma E Maia

  • 1Escola Paulista de Medicina, Federal University of São Paulo.

Acta Oto-Laryngologica
|November 18, 2014
PubMed
Summary

The video head impulse test (vHIT) shows promise in diagnosing semicircular canal disorders, revealing abnormal responses in anterior and posterior canals. Further research is needed, but vHIT is a valuable tool for vestibular evaluation.

Area of Science:

  • Neuroscience
  • Otolaryngology
  • Vestibular System

Background:

  • Vestibular disturbances significantly impact patient quality of life.
  • Accurate diagnosis of semicircular canal disorders is crucial for effective treatment.

Purpose of the Study:

  • To present clinical observations of the video head impulse test (vHIT).
  • To discuss the significance of vHIT findings in neurotology.
  • To evaluate vHIT's role in assessing semicircular canal function.

Main Methods:

  • The study involved 200 patients with reported vestibular disturbances.
  • All six semicircular canals were assessed using the vHIT.
  • Clinical neurotology assessments were performed.

Main Results:

Keywords:
VertigovHITvestibular evaluation

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  • Abnormal responses in anterior and posterior semicircular canals were frequently observed.
  • These abnormalities sometimes co-occurred with lateral canal dysfunction.
  • A case of vestibular schwannoma presented with a unilateral hypoactive posterior canal response.

Conclusions:

  • The video head impulse test (vHIT) contributes significantly to evaluating anterior and posterior semicircular canal disorders.
  • While further validation is required, vHIT shows clinical utility.
  • vHIT findings may aid in identifying specific vestibular pathologies.