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. 2022 Sep 12;31(4):1155–1166. doi: 10.1044/2022_AJA-21-00257

Figure 2.

Figure 2.

(A) Session 1 rotary chair and vestibular evoked myogenic potential (VEMP) results from a subject with misclassification. Subject was a child with CI, etiology of hearing loss was cytomegalovirus (CMV). Rotary chair results demonstrate normal gain with a phase lead, consistent with unilateral vestibular loss. Cervical vestibular evoked myogenic potential (cVEMP) demonstrates present cVEMPs, bilaterally. Ocular vestibular evoked myogenic potential (oVEMP) demonstrates present left oVEMP and absent right oVEMP, consistent with unilateral vestibular loss. (B) Session 2 rotary chair and VEMP results from the same subject (time between sessions = 16 months). Rotary chair results demonstrate abnormal gain with a phase lead, consistent with bilateral vestibular loss. cVEMP demonstrates absent cVEMPs bilaterally, consistent with bilateral vestibular loss. oVEMP demonstrates absent oVEMPs bilaterally, consistent with bilateral vestibular loss. VOR = vestibulo-ocular reflex.