The high-frequency/acceleration head heave test in detecting otolith diseases

Area of Science:

• Neuroscience
• Otolaryngology
• Vestibular System Disorders

Background:

• Otolith diseases affect balance and spatial orientation.
• Current diagnostic tools like the subjective visual vertical (SVV) test have limitations in detecting certain types of otolith dysfunction.
• The translational vestibulo-ocular reflex (tVOR) involves head movements and eye responses, potentially offering new diagnostic insights.

Purpose of the Study:

• To evaluate the efficacy of transient, high-acceleration head heaves (tVOR) in diagnosing otolith diseases.
• To compare the diagnostic utility of tVOR with the subjective visual vertical (SVV) test.
• To explore tVOR's potential in identifying both acute and chronic otolith dysfunctions.

Main Methods:

• Prospective cohort study conducted at a tertiary referral center.
• Participants included 13 patients with suspected otolith diseases and 10 age-matched controls.
• Evaluations included standard audiovestibular tests, subjective visual vertical (SVV), and translational vestibulo-ocular reflex (tVOR) testing.

Main Results:

• Five patients showed no abnormalities across all tests.
• Among the remaining eight patients, 38% had reduced tVOR responses, and 13% had an abnormal SVV.
• Two patients with chronic symptoms showed symmetrically reduced tVOR sensitivity and velocity gain; one with acute symptoms had asymmetric tVOR reduction and deviated SVV.

Conclusions:

• Transient head heaves (tVOR) can aid in diagnosing acute and chronic otolith diseases.
• tVOR appears superior to SVV in detecting bilateral symmetric and asymmetric otolith dysfunctions.
• tVOR testing, especially at higher frequencies, may serve as a valuable adjunct for comprehensive otolith assessment.