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Original Articles

Assessing the cervico-ocular reflex system via modifying the ocular vestibular-evoked myogenic potential test

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Pages 248-257 | Received 01 Feb 2020, Accepted 31 Jul 2020, Published online: 24 Aug 2020
 

Abstract

Purpose

The aim of this study was to devise a novel test for assessing the cervico-ocular reflex (COR) system via head vibration (termed h-COR) or neck vibration (termed n-COR) method.

Materials and methods

Thirteen patients with complete loss of bilateral vestibulo-ocular reflex (VOR) showing oscillopsia were assigned to Group A, while 13 patients with bilateral VOR loss but no oscillopsia were Group B. Another 13 healthy elderly served as a control. The COR test was performed via modifying the ocular vestibular-evoked myogenic potential (oVEMP) test by tapping at the forehead with head rotation (h-COR) or at mid-dorsal neck with head straight (n-COR).

Results

Both h-COR and n-COR tests displayed similar cI–cII waveforms. None of the Group A or healthy elderly showed present h-COR, while 8% of Group A and 31% of the healthy elderly revealed present n-COR. In contrast, present h-COR and n-COR were elicited in 85 and 77% of Group B, respectively. Restated, significantly higher response rate of COR in Group B (without oscillopsia) than Group A (with oscillopsia) indicates that present COR is related to the alleviation of oscillopsia.

Conclusions

Head vibration method (h-COR test) is superior to neck vibration method (n-COR test) for assessing the COR system.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Science Council, Taipei, Taiwan10.13039/501100001868 (grant no. MOST 108-2314-B002-178-MY3)

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