The Head-Bending Test in Posterior Semicircular Canal Benign Paroxysmal Positional Vertigo

Objectives: This study aimed to investigate clinical significance of a head-bending test in benign paroxysmal positional vertigo (BPPV) involving the posterior semicircular canal (PC-BPPV).Methods: We retrospectively recruited 256 patients with unilateral PC-BPPV between January 2016 and December 2021, assessed characteristics showing nystagmus (HBN).Results: Of patients, 138 (53.9%) showed HBN. Most (n=136, 98.6%) had downbeat (n=38) or without (n=98) torsional component. The remaining two pure upbeat nystagmus, respectively. component was directed contralesional side all. Between HBN, there were no significant differences such as age, lateralization, types BPPV (canalolithiasis cupulolithiasis), success rate repositioning maneuver.Conclusions: Head-bending may be useful predicting diagnosis lateralization PC-BPPV.