To compare the treatment outcomes and complications of single cycle versus multiple cycles of the canalith repositioning procedure (CRP).
Randomized controlled trial.
Academic tertiary referral center; Chiang Mai University, Thailand.
One hundred and forty-three adults who had unilateral posterior canal benign paroxysmal positional vertigo (BPPV).
Therapeutic. Patients received either a single cycle or multiple cycles of the CRP in one session.
Main Outcome Measures:
Rate of negative Dix-Hallpike test (DHT), rate of symptom improvement, dizziness handicap inventory score (DHI), and rate of complications.
At the 1st week and the 4th week recall visits after CRP the treatment outcomes between the single-CRP group and the multiple-CRP group showed no significant difference. The outcomes included: 1) rate of negative DHT (1st week: 76.9 and 76.7%, 4th week: 89.5 and 88.2%); 2) rate of complete recovery or improved symptoms (1st week: 92.3 and 91.7%; 4th week: 96.5 and 98.0%); 3) DHI scores (1st week: 22 and 28; 4th week: 6 and 10); and 4) complication rate (1st week: 12.5 and 20%; 4th week: 20 and 0%. Rate of complications in the single-CRP group (6.9%) during the 1st treatment was lower than in the multiple-CRP groups (21.1%) (p-value = 0.013).
A single cycle of CRP is as effective as multiple cycle CRP, with a lower incidence of complication and a decrease in the time for treatment. Single-cycle CRP is a more advantageous treatment for unilateral posterior canal BPPV.