Comparisons in Outcome and Subject Comfort between Rotation Chair Systems
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Background and Objectives: A rotation chair test has been used to evaluate the functionof the horizontal semicircular canals. Currently, two chair systems according to the presenceof cylindrical darkroom are used in a clinic setting. However, it has not been thoroughly investigatedwhether one system is superior to the other system or not. In this study, weaimed to compare test outcomes and subject convenience between two systems. Subjectsand Methods: Twenty subjects with no history of otologic disease were enrolled. Subjectswere tested with two systems: system [A] with a cylindrical chamber and system [B] with nochamber. The results of sinusoidal harmonic acceleration (SHA), step velocity (SV), and visualfixation (VFX) tests were compared between the systems. Subject convenience was assessedwith a questionnaire survey and results were compared between the systems. Results:There were no significant differences in gain or asymmetry in SHA test between thesystems. However, the phase of system [A] was significantly lower than that of system [B] at0.16 Hz. There was no significant difference between the systems in directional preponderance(DP) gain or DP time constant. Regarding the VFX test, gain was higher in system [A]than system [B]. Subjects reported less stuffiness and less anxiety with system [B] than system[A], while preferring the system [A] goggles. Conclusions: A rotation chair system withouta darkroom can provide a more comfortable experience for subjects in terms of stuffinessand anxiety, while showing comparable results in SHA and SV tests with a darkroomsystem.
Abstract
Background and Objectives: A rotation chair test has been used to evaluate the functionof the horizontal semicircular canals. Currently, two chair systems according to the presenceof cylindrical darkroom are used in a clinic setting. However, it has not been thoroughly investigatedwhether one system is superior to the other system or not. In this study, weaimed to compare test outcomes and subject convenience between two systems. Subjectsand Methods: Twenty subjects with no history of otologic disease were enrolled. Subjectswere tested with two systems: system [A] with a cylindrical chamber and system [B] with nochamber. The results of sinusoidal harmonic acceleration (SHA), step velocity (SV), and visualfixation (VFX) tests were compared between the systems. Subject convenience was assessedwith a questionnaire survey and results were compared between the systems. Results:There were no significant differences in gain or asymmetry in SHA test between thesystems. However, the phase of system [A] was significantly lower than that of system [B] at0.16 Hz. There was no significant difference between the systems in directional preponderance(DP) gain or DP time constant. Regarding the VFX test, gain was higher in system [A]than system [B]. Subjects reported less stuffiness and less anxiety with system [B] than system[A], while preferring the system [A] goggles. Conclusions: A rotation chair system withouta darkroom can provide a more comfortable experience for subjects in terms of stuffinessand anxiety, while showing comparable results in SHA and SV tests with a darkroomsystem.
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