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Active Head Rotation (AHR)

CPT 92546
Sinusoidal vertical axis rotational testing
Brief
This is a computerized test of the Vestibulo-Ocular Reflex (VOR), the neural mechanism that keeps a visual image registered on the fovea during head movement.
Extended
This is a computerized test of the Vestibulo-Ocular Reflex (VOR), the neural mechanism that keeps a visual image registered on the fovea during head movement. It evaluates the three functional components of the VOR system: the peripheral end organ, the vestibular nuclei of the brain stem and the higher central vestibular connections. The test is accomplished by having the patient shake his head "no" and "yes" while wearing EOG electrodes that monitor eye position and a small angular velocity sensor that measures head velocity. From this data the computer computes three characteristics of the VOR: gain (ratio of eye velocity to head velocity), phase (the number of degrees by which the eye ‘misses’ the target), and asymmetry (a comparison of gain moving right with gain moving left). This information is useful for evaluating patients with balance disorders.

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