Research in Vestibular Science

The 4th Joint Meeting of Japan Society of Equilibrium Research and Korean Balance Society: A Conference Report: Ho Yun Lee, Kyu-Sung Kim; Res Vestib Sci. 2019;18(1):24-26. Published online March 15, 2019; DOI: https://doi.org/10.21790/rvs.2019.18.1.24

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제4차 한일평형의학회 합동컨퍼런스 참석보고: Ho Yun Lee, Kyu-Sung Kim; Received December 26, 2018 Accepted March 2, 2019 Published online March 2, 2019; [Accepted]

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Abstract: 제4회 한일평형의학회 합동컨퍼런스 참석 보고를 하고자 합니다.

Clinical Significance of Spontaneous Nystagmus in Horizontal Semicircular Canal Benign Paroxysmal Positional Vertigo: Jun Lee, Sehun Chang, Ho Yun Lee; Res Vestib Sci. 2018;17(1):18-22. Published online March 15, 2018; DOI: https://doi.org/10.21790/rvs.2018.17.1.18

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Abstract PDF: Objectives
We aimed to assess the clinical significance of spontaneous nystagmus (SN) in horizontal semicircular canal benign paroxysmal positional vertigo (HC-BPPV).
Methods
Twenty-four patients who were diagnosed with HC-BPPV in Eulji University Hospital from January 2015 to December 2016 were recruited. Various bed-side examinations including SN in both sitting and supine position, head roll test, and bithermal caloric test were evaluated. The number of canalith repositioning maneuvers were counted in all patients.
Results
SN was observed in 18.2% of geotropic HC-BPPV and 38.5% of apogeotropic HC-BPPV, respectively. There was no significant difference between presence of SN and the direction of initial nystagmus (p=0.386, 2-tailed Fisher exact test). The mean number of otolith repositioning maneuvers in patients with SN was 3.29±1.799 and this was significantly higher than in patients without SN (1.76±0.831) (p=0.009). Although the mean number of repositioning maneuver in patients in apogeotropic HC-BPPV and SN (3.80±1.924) tended to be higher than those who were diagnosed with apogeotropic HC-BPPV without SN (1.88±1.991) (p=0.035), the post hoc analysis with Bonferroni correction revealed that it was not significant because it was higher than the adjusted p-value (p=0.017). The initial direction of nystagmus was changed into the opposite direction in 29.17% of patient. However, this change was not different according to presence of SN (p=0.374, 2-tailed Fisher exact test).
Conclusions
The presence of SN in HC-BPPV may be associated with lower treatment response. In particular, cautions are needed in patients with apogeotropic HC-BPPV.

Clinical Significance of Spontaneous Nystagmus in Horizontal Semicircular Canal Benign Paroxysmal Positional Vertigo: Jun Lee, Sehun Chang, Ho Yun Lee; Received February 26, 2018 Accepted March 7, 2018 Published online March 7, 2018; [Accepted]

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Abstract: Objectives
We aimed to assess the clinical significance of spontaneous nystagmus (SN) in horizontal semicircular canal benign paroxysmal positional vertigo (HC-BPPV).
Methods
Twenty-four patients who were diagnosed with HC-BPPV in our hospital from January 2015 to December 2016 were recruited. Various bed-side examinations including SN in both sitting and supine position, head roll test and bithermal caloric test was evaluated. The number of canalith repositioning maneuvers were counted in all patients.
Results
18.2% of geotropic HC-BPPV and 38.5% of apogeotropic HC-BPPV showed SN. There was no significant difference between presence of SN and the direction of initial nystagmus (p=0.386, two-tailed Fisher's exact test). The mean number of otolith repositioning maneuvers in patients with SN was 3.29±1.799 and this was significantly higher than in patients without SN (1.76±0.831) (p=0.009). Although the mean number of repositioning maneuver in patients in apogeotropic HC-BPPV and SN (3.80±1.924) tended to be higher than those who were diagnosed with apogeotropic HC-BPPV without SN (1.88±1.991) (p=0.035), the post-hoc analysis with Bonferroni correction revealed that it was not significant because it was higher than the adjusted p value (p=0.017). the initial direction of nystagmus was changed into the opposite direction in 29.17% of patient. However, this change was not different according to presence of SN (p=0.374, two-tailed faisher's exact test).
Conclusions
The presence of SN in HC-BPPV may be associated with lower treatment response. In particular, cautions are needed in patients with apogeotropic HC-BPPV.

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