Abstract:Objective To study whether the times of canalith repositioning procedures(CRPs), the caloric test, the residual dizziness (RD) after CRPs were related to the recurrence rate in idiopathic horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV). Method:Successful CRPs of HSC-BPPV patients in outpatient from January 2016 to January 2018 were enrolled. All patients were performed the Barbecue maneuver. According to the times of CRPs, they were divided into two groups: group A (<3times) and group B (≥3times). According to the patients who had residual dizziness(RD), they were divided into another two groups: group C (no RD), group D (with RD). All patients underwent caloric test. Result There was no significant difference in the recurrence rate between group A (20.9%) and group B (26.8%). The difference between group C (11.8%) and group D (32%) in recurrence rate was of statistical significance (p=0.033). Patients with residual dizziness after CRPs complicated with abnormal caloric test with the highest recurrence rate,66.7%). The recurrence rate was the lowest when patients with CRPs < 3 times and no residual dizziness after CRPs (6.3%). Conclusion The recurrence rate of horizontal semicircular canal BPPV is not related to the times of CRPs. A strong correlation between RD and abnormal C-test is noted. Residual dizziness after CRPs with abnormal caloric test indicates the increased recurrence rate of the patients with horizontal semicircular canal BPPV.