• Min-Beom Kim, Hyun S Lee, and Jae H Ban.
• Department of Otolaryngology-Head and Neck Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University, School of Medicine, Seoul, Korea.
• Laryngoscope. 2014 Oct 1;124(10):2400-3.

Objectives/HypothesisTo investigate the characteristics of residual symptoms and to evaluate the effects of adjuvant vestibular suppressants on residual symptoms after successful canalith repositioning procedures (CRPs).Study DesignIndividual randomized controlled trial.MethodsOne hundred fifty patients with idiopathic benign paroxysmal positional vertigo who achieved successful CRPs on initial visit participated in this study. Dizziness Handicap Inventory (DHI) questionnaires were completed before CRPs. All study populations were divided into three groups after successful CRPs on the initial visit day: the medication (V) group (treated with a vestibular suppressant [dimenhydrinate 50 mg per day]), the placebo (P) group, and the no medication (N) group. One week after successful CRPs, residual symptoms were checked and repeated DHI questionnaires were completed to compare residual symptoms.ResultsAmong the 138 patients who did not show positional nystagmus at follow-up, 67 (48.5%) complained of residual symptoms. The presence of residual symptoms was more prevalent in the P and N group compared with the V group (P = .035, P = .017, respectively). The most frequent residual symptom was lightheadedness (n = 42). Moreover, in the V group, lightheadedness was significantly reduced compared with the P group (P = .029). However, in the analysis of DHI, total and subscale scores did not differ across the three groups before or after successful CRP.ConclusionsVestibular suppressants significantly reduced residual symptoms compared to both placebo and no medication after CRP. However, there was no significant reduction in DHI score compared with the control group, suggesting that the residual symptoms could not be evaluated by DHI score alone.© 2014 The American Laryngological, Rhinological and Otological Society, Inc.

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