Repeatability of sound-evoked triceps myogenic potentials

Area of Science:

• Neuroscience
• Vestibular System Research
• Myogenic Potentials

Background:

• Vestibular evoked myogenic potentials (VEMPs) are increasingly used to assess vestibular function.
• Triceps VEMPs (tVEMPs) offer a potential method for evaluating the vestibulospinal reflex.
• Understanding the repeatability of tVEMPs is crucial for their clinical application.

Purpose of the Study:

• To evaluate the repeatability of sound-evoked tVEMPs.
• To determine the influence of visual feedback on tVEMP repeatability.
• To assess the potential clinical utility of tVEMPs.

Main Methods:

• A longitudinal, repeated measures study design was employed.
• tVEMP responses to 500-Hz tone bursts were recorded in 15 healthy participants on three separate occasions.
• Statistical analyses included ANOVA, intra-class correlations, and Bland-Altman methods to assess repeatability and the effect of visual feedback.

Main Results:

• tVEMP response rates were 63% (eyes open) and 68% (eyes closed).
• When present, tVEMP latencies and amplitudes demonstrated fair to good repeatability.
• Repeatability of tVEMP latencies and amplitudes was poorer with eyes closed compared to eyes open.

Conclusions:

• Current tVEMP response rates are insufficient for widespread clinical use.
• Visual feedback appears to modulate tVEMP responses, enhancing repeatability.
• Refining balance tasks may improve tVEMP response rates and clinical applicability.