Research in Vestibular Science

The Head-Bending Test in Posterior Semicircular Canal Benign Paroxysmal Positional Vertigo: Sol-lim Choi, Hyun-Sung Kim, Jae-Hwan Choi, Eun Hye Oh; Res Vestib Sci. 2022;21(4):99-103. Published online December 15, 2022; DOI: https://doi.org/10.21790/rvs.2022.21.4.99

Abstract PDF: Objectives
This study aimed to investigate clinical significance of a head-bending test in benign paroxysmal positional vertigo (BPPV) involving the posterior semicircular canal (PC-BPPV).
Methods
We retrospectively recruited 256 patients with unilateral PC-BPPV between January 2016 and December 2021, and assessed the clinical characteristics of patients showing head-bending nystagmus (HBN).
Results
Of 256 patients, 138 (53.9%) showed HBN. Most patients (n=136, 98.6%) had downbeat nystagmus with (n=38) or without (n=98) torsional component. The remaining two patients had pure upbeat and torsional nystagmus, respectively. The torsional component was directed to the contralesional side in all. Between patients with and without HBN, there were no significant differences in clinical characteristics such as age, lateralization, types of BPPV (canalolithiasis or cupulolithiasis), and success rate of repositioning maneuver.
Conclusions
Head-bending test may be useful in predicting the diagnosis and lateralization of PC-BPPV.

Dissociated Vertical-Torsional Nystagmus in Vestibular Nucleus Lesion: Hyun-Sung Kim, Eun Hye Oh, Jae-Hwan Choi; Res Vestib Sci. 2022;21(1):19-23. Published online March 15, 2022; DOI: https://doi.org/10.21790/rvs.2022.21.1.19

Abstract PDF: Dissociated vertical-torsional nystagmus is a unique form of nystagmus characterized by conjugate torsional but disparate vertical components. It has been mainly reported in internuclear ophthalmoplegia or medial medullary lesion involving the medial longitudinal fasciculus (MLF). The patterns of the nystagmus may be explained by a disruption of vestibulo-ocular reflex pathways from vertical semicircular canal or utriculo-ocular reflex within the MLF, but it is debatable. We described a dissociated upbeat-torsional nystagmus in a patient with vestibular nucleus infarction without involvement of MLF.

Isolated Floccular Infarction with Impairment of High-Frequency Vestibulo-Ocular Reflex: A Case Report: Eun Hye Oh, Hyun-Sung Kim, Jae-Hwan Choi; Res Vestib Sci. 2021;20(4):147-150. Published online December 15, 2021; DOI: https://doi.org/10.21790/rvs.2021.20.4.147

Abstract PDF: The flocculus plays a crucial role in control of eye movements. Based on animal experiment, it is suggested that the flocculus is important for governing vestibuleocular reflexes. In humans, an isolated floccular lesion is extremely rare. We report oculomotor abnormalities in a patient with unilateral infarction of the flocculus, and compare our results with those of previously reported patients with floccular lesion.

고주파 전정안구반사의 이상을 보인 단독 타래 경색: Eun hye Oh, Jae-Hwan Choi, Hyun-Sung Kim; Received November 8, 2021 Accepted November 22, 2021 Published online November 22, 2021; [Accepted]

Abstract: The flocculus plays a crucial role in control of eye movements. Based on animal experiment, it is suggested that the flocculus is important for governing vestibule-ocular reflexes (VORs). In humans, an isolated floccular lesion is extremely rare. We report oculomotor abnormalities in a patient with unilateral infarction of the flocculus, and compare our results with those of previously reported patients with floccular lesion.

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