Analysis of related factors of recurrence in horizontal semicircular canal benign paroxysmal positional vertigo: a pilot study

Abstract

Background: Whether the abnormal caloric test (C-test) affects recurrence rate in horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV) with residual dizziness (RD) is not clear.

Objectives: 1) Analyze the association of the cycles of canalith repositioning procedure (CRP), C-test and RD after CRP and 2) determine which affects the recurrence rate in idiopathic HSC-BPPV.

Materials and methods: Eighty-four patients with HSC-BPPV (canal type) were included in this work. The cycles of CRP, C-test, the RD after CRP and HSC-BPPV recurrence rate were recorded. Depending on the times of CRP and patients who presented dizziness after treatment, patients were divided into four groups, the relationship between abnormal C-test and RD was analyzed. The outcomes of recurrence rate were compared between groups, respectively.

Results: (1) The abnormal C-test prevalence among the HSC-BPPV patients with RD was 36% while in no RD group was 14.7%. The difference was statistically significant (p = .045). (2) The recurrence rate was 11.8% in no RD group but in RD group the rate was higher (32%, p = .039). When patients combined with abnormal C-test, the recurrence rate was significantly higher (77.8% vs. 20%) (p = .033).

Conclusions: A weak correlation between RD and abnormal C-test is noted. Presence of RD and abnormal C-test in patients with HSC-BPPV predicts a higher recurrence rate.

Chinese abstract

背景：对于水平半规管良性阵发性位置性眩晕（HSC-BPPV）伴残余性眩晕（RD）, 异常热量试验（C-test）是否影响其复发率尚不清楚。

目的：1）分析特发性HSC-BPPV患者耳石复位手术（CRP）周期、C-试验和CRP后RD的相关性；2）确定影响复发率的因素。

材料与方法：该项研究包括84例HSC-BPPV（管型）患者。记录CRP周期、C试验、CRP后RD及HSC-BPPV复发率。根据CRP的次数和治疗后出现头晕的患者, 将患者分为4组, 分析C检验异常与RD的关系。比较两组复发率的结果。

结果：（1）HSC-BPPV伴RD患者的C检验异常率为36%, 非RD组为14.7%。差异有统计学意义（p=.045）。（2）无RD组复发率为11.8%, 但RD组复发率较高（32%, p=0.039）。当患者伴有异常C检验时, 复发率显著高于对照组（77.8%比20%, p=0.033）。

结论：RD与异常C检验呈弱相关。HSC-BPPV患者出现RD和异常C-试验预示着较高的复发率。

Keywords:

• The caloric test
• residual dizziness
• recurrence
• canalith repositioning procedure

Disclosure statement

No potential conflict of interest was reported by the authors.