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Video head impulse test (VHIT)
The video head impulse test is useful in the assessment of vestibular disorders. The
test offers a clinical indicator of a semicircular canal deficit.
• Velocity Leftward/Rightward: head velocity stimuli and eye velocity responses
are
• Superimposed and displayed.
• Gain Leftward/Rightward vs. Peak head velocity (deg/s): refers to the ratio of the
eye velocity to the head velocity.
• Acceleration Leftward/Rightward: The head acceleration and eyes acceleration
during the head shake (leftward/Rightward.)
• Stimulus Leftward/Rightward vs. the Peak Head velocity: refers to the maximum
angular displacement applied during the head shake.
Results:
• Gain Avg.Leftward/Rightward. The average gain of all Leftward/ Rightward
shakes.
• SD Leftward/Rightward. The standard deviations Leftward/ Rightward
shakes.
• Symmetry: refers to gain significantly worse in one direction than another.
• Avg. Gain: The average gain of all shakes.
• Test Compliance: refers to a measure of performance of thetest.
• Discard left/ right: Impulse not included on the analysis
Passive calibration of the head (VHIT)
It is not a test in itself. But the results are shown in graphical form of the passive
calibration of the head
• Speed Left / Right: The head speed stimuli and the responses of the speed of
the eye over time are superimposed.
• Gain Left / Right vs. head speed peak (º / s): Refers to the ratio of the speed of
the eye to the velocity of the head.
Results:
• Gain avg. Left / right: The average gain to the left / to the right.
• Symmetry: refers to the gain significantly worse in one direction than in
another.
• Gain AVG: The average gain of all impulses.
• Discarded left / right. Stimuli those were not included in any of the previous
calculations.
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