Comparative effectiveness of the exact versus estimated angle of head position in the Epley maneuver: a randomized controlled trial.

Introduction The Epley maneuver is the recommended treatment for benign paroxysmal positional vertigo of the posterior semicircular canal (PC-BPPV). Traditionally, the angle of the patient's head in each position during the Epley maneuver is not monitored and subjectively estimated by physicians. As a result, deviations of head angles from the standard may affect the treatment result.