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. 2014;19(4):239-47.
doi: 10.1159/000360124. Epub 2014 Jul 2.

Optimizing ocular vestibular evoked myogenic potential testing for superior semicircular canal dehiscence syndrome: electrode placement

M Geraldine Zuniga  1 , Marcela Davalos-Bichara, Michael C Schubert, John P Carey, Kristen L Janky
Affiliations

Optimizing ocular vestibular evoked myogenic potential testing for superior semicircular canal dehiscence syndrome: electrode placement

M Geraldine Zuniga et al. Audiol Neurootol. 2014.

Abstract

Objective: To compare the sensitivity and specificity of ocular vestibular evoked myogenic potentials (oVEMPs) using 2 electrode montages for the diagnosis of superior canal dehiscence syndrome (SCDS).

Subjects: 16 SCDS patients (17 affected-SCDS ears, 15 contralateral-SCDS ears) and 12 controls (24 ears).

Methods: oVEMPs were recorded in response to 500-Hz tone bursts using 2 electrode montages. For both montages the active electrode was placed approximately 5 mm below each eye and a ground electrode on the sternum. For montage 1 (standard), the reference electrode was centered 2 cm below each active electrode. For montage 2, the reference electrode was placed on the chin.

Results: For either montage, the separation between oVEMP amplitudes in affected-SCDS ears and controls was significant (p < 0.001), with excellent sensitivity and specificity (>90%).

Conclusion: oVEMP recordings with the standard montage remain a reliable method for evaluation of SCDS.

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Figures

Figure 1
Figure 1
A. Montage-1: standard electrode placement. B. Montage-2: using a single reference electrode on the chin
Figure 2
Figure 2
Sample oVEMP waveforms obtained using montage 1 (black) and montage 2 (grey) in the three ear categories – control, contralateral-SCDS and SCDS. The contralateral-SCDS example corresponds to the contralateral ear of the displayed SCDS ear.
Figure 3
Figure 3
N10 oVEMP amplitudes. A. Montage-1; B. Montage-2.
Figure 4
Figure 4
Peak-to-peak oVEMP amplitudes. A. Montage-1; B. Montage-2.
Figure 5
Figure 5
Percent difference in oVEMP amplitude between montage-1 and montage-2
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