The High-Frequency/Acceleration Head Heave Test in Detecting Otolith Diseases

Area of Science:

• Neuroscience
• Otolaryngology
• Vestibular System Research

Background:

• Otolith diseases can be challenging to diagnose, particularly chronic or bilateral conditions.
• Current diagnostic tools may not always capture the full spectrum of otolith dysfunction.

Purpose of the Study:

• To evaluate the efficacy of transient, high-acceleration head heaves (translational vestibulo-ocular reflex [tVOR]) in diagnosing otolith diseases.
• To compare the diagnostic utility of tVOR with the subjective visual vertical (SVV) test.

Main Methods:

• Prospective cohort study involving 13 patients with suspected otolith disease and 10 controls.
• Standard audiovestibular evaluations, including audiometry, electronystagmography, head thrust tests, vestibular-evoked myogenic potentials, SVV, and tVOR testing.
• Analysis of tVOR sensitivity and velocity gain.

Main Results:

• Three out of eight patients with abnormal findings showed reduced tVOR responses (38%).
• One patient (13%) had an abnormal SVV.
• Reduced tVOR responses were observed in patients with both acute and chronic symptoms, with asymmetric reductions noted in one case.

Conclusions:

• Transient, high-acceleration head heaves (tVOR) may be a valuable adjunct for detecting acute and chronic otolith dysfunction.
• tVOR appears superior to SVV in identifying bilateral symmetric or asymmetric otolith diseases.
• SVV may not detect compensated or bilateral symmetric otolith conditions effectively.