What is the true incidence of horizontal semicircular canal benign paroxysmal positional vertigo?

Journal: Otolaryngology--Head And Neck Surgery : Official Journal Of American Academy Of Otolaryngology-Head And Neck Surgery
Published:
Abstract

Objective: To assess the correct incidence of horizontal semicircular canal (H-SCC) benign paroxysmal positional vertigo (BPPV).

Methods: Retrospective assessment of patients with BPPV. Methods: All patients with BPPV were included and the rates of involvement of posterior, horizontal, and anterior SCCs were determined.

Results: One hundred sixty-nine patients with the diagnosis of BPPV were evaluated. One hundred forty-four patients (85.2%) were found to have posterior SCC (P-SCC) involvement, and there were 20 patients (11.8%) with horizontal SCC (H-SCC) and 2 patients (1.2%) with anterior SCC (A-SCC) involvement. Three patients (1.8%) had simultaneous H-SCC and P-SCC BPPV ipsilaterally. Geotropic nystagmus was seen in 17 out of 23 patients (73.9%) in roll test, and ageotropic nystagmus was seen in the remaining 6 patients (26.1%).

Conclusions: H-SCC constitutes 13.6% of all BPPV cases. H-SCC BPPV with geotropic nystagmus is more common. H-SCC BPPV can coexist with ipsilateral P-SCC BPPV. However, in some cases of H-SCC BPPV, Dix-Hallpike maneuver can cause vertigo and horizontal nystagmus. This may be confused with P-SCC BPPV. Therefore, the roll test must be performed in all cases in addition to Dix-Hallpike maneuver and both ears must be evaluated with respect to all SCCs for BPPV. Methods: C-4.

Authors
Burak Cakir, Ibrahim Ercan, Zeynep Cakir, Senol Civelek, Ibrahim Sayin, Suat Turgut

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