Clinical characteristics and associated factors of canal switch in benign paroxysmal positional vertigo

Article type: Research Article

Authors: Lee, Geonho^a | Lee, Seul-Gi^a | Park, Hee-Sung^a | Kim, Bong Jik^a | Choi, Seong-Jun^{b; 1} | Choi, Jin Woong^{a; 1; *}

Affiliations: [a] Department of Otorhinolaryngology-Head and Neck Surgery, Chungnam National University, College of Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea | [b] Department of Otolaryngology—Head and Neck Surgery, College of Medicine, Soonchunhyang University, Cheonan Hospital, Cheonan, Republic of Korea

Correspondence: [*] Corresponding author: Jin Woong Choi, M.D., Ph.D., Department of Otorhinolaryngology – Head & Neck Surgery, Chungnam National University, College of Medicine, 282 Munhwa-ro, Jung-gu, Daejeon, 301-721, 35015, South Korea. Tel.: +82 42 280 8375; Fax: +82 42 253 4059; E-mail: choijw@cnu.ac.kr.

Note: [1] These two authors contributed equally to this study.

Abstract: BACKGROUND:Canal switch benign paroxysmal positional vertigo (CS-BPPV) is a transition of BPPV involving one canal to another canal during or after canalith repositioning procedures (CRP). OBJECTIVE:To investigate the clinical characteristics of CS-BPPV and its associated factors. METHODS:The data of 2,303 patients with BPPV involving the lateral canal (LC) or posterior canal (PC) were retrospectively analyzed. Demographics, etiologies, and various clinical parameters related to CRP were compared between patients with and without CS-BPPV. RESULTS:Sixty-eight (2.95%) patients exhibited CS-BPPV. For patients with CS-BPPV from the PC to the LC, as well as those with CS-BPPV from the LC to the PC, the CRP number for the original canal in CS-BPPV was significantly greater than in non-CS-BPPV (P = 0.002). More CRP cycles were required to treat CS-BPPV than non-CS-BPPV involving the same canal. Multivariate analysis showed that CS-BPPV from the LC to the PC was significantly associated with multiple CRP cycles and use of the Gufoni maneuver (P = 0.038 and P < 0.001, respectively). CONCLUSIONS:The use of multiple cycles of CRP and the Gufoni maneuver were significantly associated with the onset of CS-BPPV. Furthermore, more CRP cycles were needed for the treatment of CS-BPPV than for non-CS-BPPV involving the same canal.

Keywords: Benign paroxysmal positional vertigo, canal conversion, canal switch, canalith repositioning procedures, Gufoni maneuver

DOI: 10.3233/VES-190667

Journal: Journal of Vestibular Research, vol. 29, no. 5, pp. 253-260, 2019