Functional Analysis Of The Vertical Semicircular Canal Using Vertical Plane Swing Test And Making Its Normal Values

ObjectiveThe purpose of this study was to set up a method to analyse the vertical semicircular canal function and study the normal values of the vertical semicircular canal function using the vertical plane swing test.MethodsA prospective analysis of 100 normal persons who were treated using the vertical plane swing test with the newly developed automatic vestibular function diagnosis and therapy system(SRM-Ⅳ). These persons were rotated 180°at a sinusoidal speed (acceleration 45°/s, maximum speed 90°/s) in the vertical semicircular canal plane. Using a PC, evoked vertical nystagmus was analyzed in order to evaluate the excitability of vertical semicircular canals, including the number and the duration of nystagmus, the slow phase velocity and other parameters. In the test procedure, with the two pairs of the right anterior vertical semicircular canal and left posterior vertical semicircular canal (RALP) as well as the left anterior vertical semicircular canal and the rear right vertical semicircular canals (LARP), the average slow phase velocity of the vertical nystagmus and the directional preponderance (DP) of the two pairs of vertical semicircular canals were calculated using PC and SPSS13.0 software for statistical analysis.ResultsThe normal DP range of the vertical semicircular canal in the health group was found (idea:≤20%; normal high: 20% ~ 25%).ConclusionThe result indicate that the 180°vertical plane sinusoidal swing method can be effective in functional analysis of the vertical semicircular canal, it was expected to be reliably used in clinical treatment.