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Does Electrode Impedance Affect the Recording of Ocular Vestibular-Evoked Myogenic Potentials?
University of Sydney, Australia.
Linköping University, Department of Clinical and Experimental Medicine, Division of Neuroscience. Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Anaesthetics, Operations and Specialty Surgery Center, Department of Otorhinolaryngology in Linköping.
University of Sydney, Australia.
University of Sydney, Australia.
2014 (English)In: JOURNAL OF THE AMERICAN ACADEMY OF AUDIOLOGY, ISSN 1050-0545, Vol. 25, no 10, 969-974 p.Article in journal (Refereed) Published
Abstract [en]

Background: In evoked potential testing, it is common practice to abrade the skin surface as a means of reducing and balancing electrode impedance. The effects of skin preparation and electrode impedance on ocular vestibular-evoked myogenic potential (oVEMP) prevalence and amplitudes are not known. Purpose: We sought to determine whether comparable oVEMP waveforms could be recorded without excessive skin preparation. Research Design: This was a prospective study with a repeated-measures (within-subjects) design. Study Sample: The study group comprised 20 healthy participants (12 females and 8 males) ages 21-57 yr. Data Collection and Analysis: oVEMP reflexes were recorded in response to air-conducted and bone-conducted (AC and BC) stimuli in three conditions. In the first condition (no skin preparation), electrodes were simply placed over the skin surface. For the second condition (moderate skin preparation), oVEMP testing was repeated after the skin had been prepared with 70% isopropyl alcohol swabs. oVEMPs recorded in these two conditions were then compared with those recorded using a third conventional protocol whereby the skin was abraded with skin preparation gel until electrode impedances were low and balanced. For BC stimuli, reflex amplitudes and latencies were compared using a repeated-measures general linear model. For AC stimuli, rates of reflex detection were analyzed using a generalized estimating equation. Nonparametric Friedman tests were used to compare AC oVEMP amplitudes across the three conditions. Results: There was no significant effect of electrode impedance on reflex amplitudes, latencies, or rates of detection (p greater than 0.05). The results indicated significant stimulus-related artifact (greater than= 3 mu V) in 25 of 40 recordings under the high-impedance condition in response to BC stimulation. The stimulus artifact was detectable in 12 of 40 recordings after moderate skin preparation and in 5 recordings after skin abrasion. Conclusions: Comparable rates of reflex detection and oVEMP amplitudes were recorded in the three conditions, implying that rigorous rubbing of the facial skin is largely unnecessary in clinical oVEMP testing. However, for oVEMPs recorded in response to a single-polarity stimulus, reducing and balancing electrode impedances with either isopropyl alcohol wipes or skin abrasion may help reduce unwanted stimulus artifact.

Place, publisher, year, edition, pages
American Academy of Audiology , 2014. Vol. 25, no 10, 969-974 p.
Keyword [en]
Electrode impedance; electromyography; oVEMP; vestibular function
National Category
Clinical Medicine
URN: urn:nbn:se:liu:diva-113375DOI: 10.3766/jaaa.25.10.5ISI: 000346461400005PubMedID: 25514449OAI: diva2:781555

Funding Agencies|Garnett Passe and Rodney Williams Memorial Foundation; National Health and Medical Research Council of Australia

Available from: 2015-01-16 Created: 2015-01-16 Last updated: 2015-04-01

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Schulin, Mikael
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Division of NeuroscienceFaculty of Health SciencesDepartment of Otorhinolaryngology in Linköping
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