Normative Vestibular-Ocular Reflex Gain Values for the Vertical Semicircular Canals
Louise Hag, Emil Riis Abrahamsen, Dan Dupont Hougaard
Abstract
Objectives: To determine normative vestibular-ocular-reflex (VOR) gain values for the vertical semicircular canals (SCCs) within a Danish cohort of healthy adults. Normative data regarding the vertical SCCs are sparse. Assessing the function of all 6 SCCs is important, as some vestibular diseases may selectively affect specific SCCs. Methods: A prospective cross-sectional study of 60 subjects aged 18-65 years with no previous vestibular disorders. All subjects underwent complete examination of all 6 SCCs with EyeSeeCam video head impulse test (vHIT) system. Results: Mean VOR gain values of the right anterior and left posterior canal were 1.46 and 1.43 respectively. For the left anterior and right posterior canals, mean VOR gain values were 0.96 and 0.97 respectively. Conclusions: Our results suggest that mean VOR gain is close to 1.4 in the right anterior and left posterior plane and close to one for the left anterior and right posterior plane when testing the vertical SCCs in healthy adults with the EyeSeeCam vHIT system.