수평 반고리관 양성돌발성두위현훈에서 아형에 따른 등속회전검사의 비교 (Can Cupulolithiasis Affect the Time Constant or Gain of the Velocity Step Test?)

서지정보

· 발행기관 : 대한평형의학회
· 수록지 정보 : Research in Vestibular Science / 18권 / 4호 / 98 ~ 102페이지
· 저자명 : 김민태, 최지은, 이민영, 정재윤

초록

Objectives: The nystagmus evoked by an angular velocity step is influenced by the cupula dynamics and the status of velocity storage mechanisms. This study questioned whether the cupulolithiasis of horizontal canal benign paroxysmal positional vertigo (HC-BPPV) affects the time constant or gain of the velocity step test.Methods: We performed a retrospective study of 30 patients who diagnosed with HC-BPPV and performed rotary chair test at Dankook University Hospital from June 2010 to May 2017. All patients had normal vestibular function on the si-nusoidal harmonic acceleration test. According to the direction of nystagmus on the head roll test, we further divided the patients into “geotrophic” (canalo-lithiasis) and “apogeotrophic” (cupulolithiasis) groups. We compared the time constant (Tc), gain, and directional preponderance (DP) between the 2 groups. We also compared the time constant and gain between lesion side of BPPV and normal side in each group.Results: In the supine head roll, geotrophic nystagmus observed in 14 patients and apogeotrophic nystagmus observed in 16 patients. When parameters of the velocity step test compared according to lesion side of BPPV (per-rotary of lesion side, postrotary of lesion side, per-rotary of normal side, and postrotary of normal side), there were no significant differences in Tc, gain, and DP between the 2 groups. There were also no significant differences in Tc and gain between lesion side and normal side in each group.Conclusions: We assumed that cupulolithiasis of HC-BPPV could affect the cu-pular deflection evoked by an angular velocity step, but there were no significant differences in Tc and gain between patients with cupulolithiasis and canalolithi-asis.

영어초록

Objectives: The nystagmus evoked by an angular velocity step is influenced by the cupula dynamics and the status of velocity storage mechanisms. This study questioned whether the cupulolithiasis of horizontal canal benign paroxysmal positional vertigo (HC-BPPV) affects the time constant or gain of the velocity step test.Methods: We performed a retrospective study of 30 patients who diagnosed with HC-BPPV and performed rotary chair test at Dankook University Hospital from June 2010 to May 2017. All patients had normal vestibular function on the si-nusoidal harmonic acceleration test. According to the direction of nystagmus on the head roll test, we further divided the patients into “geotrophic” (canalo-lithiasis) and “apogeotrophic” (cupulolithiasis) groups. We compared the time constant (Tc), gain, and directional preponderance (DP) between the 2 groups. We also compared the time constant and gain between lesion side of BPPV and normal side in each group.Results: In the supine head roll, geotrophic nystagmus observed in 14 patients and apogeotrophic nystagmus observed in 16 patients. When parameters of the velocity step test compared according to lesion side of BPPV (per-rotary of lesion side, postrotary of lesion side, per-rotary of normal side, and postrotary of normal side), there were no significant differences in Tc, gain, and DP between the 2 groups. There were also no significant differences in Tc and gain between lesion side and normal side in each group.Conclusions: We assumed that cupulolithiasis of HC-BPPV could affect the cu-pular deflection evoked by an angular velocity step, but there were no significant differences in Tc and gain between patients with cupulolithiasis and canalolithi-asis.

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