Is Skull-Vibration-Induced Nystagmus Modified with Aging?

Area of Science:

• Vestibular neurophysiology
• Otolaryngology
• Neurology

Background:

• The head impulse test (SVINT) is clinically used, but age-related changes in frequency (FN) and slow-phase angular velocity (SPAV) require further investigation.
• Unilateral peripheral vestibular loss (UPVL) presents diagnostic challenges, particularly concerning age-dependent functional alterations.

Purpose of the Study:

• To retrospectively evaluate age-related variations in SVINT frequency (FN) and slow-phase angular velocity (SPAV) in patients with UPVL.
• To correlate SVINT parameters with disease severity and patient age.

Main Methods:

• Retrospective analysis of SVINT, vestibular-evoked potentials (C-VEMP, O-VEMP), and head impulse test (HIT) results.
• Comparison of SVINT parameters against patient age and UPVL severity.
• Assessment of timing between UPVL onset and clinical evaluation.

Main Results:

• Significant age-dependent changes in SVINT frequency (FN) and slow-phase angular velocity (SPAV) were observed.
• In UPVL patients, disease severity influenced SPAV but not FN.
• Stimulus application side also affected FN and SPAV.

Conclusions:

• Instrumental evaluation of SVINT demonstrates significant age-related differences.
• SVINT is a reliable test for assessing vestibular function, with findings varying with age.
• Further research is needed to elucidate the clinical significance and physiological basis of SVINT findings in aging populations.