Epley maneuver and the head autorotation test in benign paroxysmal positional vertigo

The head autorotation tests can be affected with the dynamic changes within the semicircular canals caused by benign paroxysmal positional vertigo (BPPV). The vestibular autorotation test is a method of examining the VOR (especially the VOR that develops at higher frequencies like those that occur in the everyday environment). Twenty patients who had been diagnosed as having posterior semicircular canal BPPV were evaluated with head autorotation tests before and after the treatment maneuver. The head autorotation tests were performed just before the use of the Epley maneuver and after the resolution of symptoms and the typical nystagmus pattern. The mean gain values for horizontal rotation tests during the pre-treatment period were 0.823, 0.844, and 0.840 for the frequencies 1, 2, and 3 Hz, respectively. The mean gain values increased by 0.095 (95% confidence interval) with Epley's maneuver. But this difference difference between the pre-treatment and post-treatment values was not statistically significant. All patients were also evaluated with vertical active tests. The differences between the pre-treatment and post-treatment values were not statistically significant in the vertical autorotation group. The phase values were within normal range in the horizontal and vertical rotation tests and remained so after the Epley maneuver. The stimulation of the VOR caused by BPPV did not affect gain and phase values to a statistically significant degree, and the values noted after the resolution of the patient's symptoms improved slightly but without statistical significance.