Vestibular evoked myogenic potential eliciting in normal subjects: comparison of four different methods.

Objective: Vestibular evoked myogenic potential (VEMP) recording is a new method for testing the otolith receptors and vestibulospinal pathways. The aim of this study was to evaluate the characteristics of VEMP using four different techniques to find reasons to prefer one type of recording over the others.

Material And Methods: Twenty healthy persons, 10 males and 10 females with ages ranging from 20 to 57 years (mean age 41 years), were enrolled in this study. Eliciting of VEMPs by using monaural or binaural acoustic stimulation and unilateral or bilateral SCM contraction was evaluated; 105 dB NHL acoustic stimulation consisting of 145 dB rarefaction clicks was applied. Latencies of p13, n23, n34, p44 peaks; amplitudes p13-n23 and n34-p44; and interaural amplitude differences (IADs) were assessed.

Results: All four methods elicited constant and evident waveforms. The reliability coefficients of amplitudes were high for all four methods and for both waves. However, the higher scores of reliability appeared for the monaural-ipsilateral recording. The results indicated no statistically significant difference between the right and left sides for all four types of VEMP eliciting. No correlation was found between IAD13-23 and IAD34-44 for all four methods. Statistically significant differences were found only for n23 latency among the four methods.

Conclusions: Although no evidence to reject or strongly favour a specific method was found, the monaural-ipsilateral recording was associated with some advantages.