[Vestibular function tests for vestibular migraine: clinical implication of video head impulse and caloric tests].

Objective: To review the results of caloric test and the video head impulse test (vHIT) in a cohort of VM patients and assessed the value of each for predicting the prognosis in VM patients. Method: A retrospective analysis was performed on VM patients in our vertigo clinic, vestibular function were assessed by caloric test and vHIT at the initial visit and 6 months after treatment. Complete response (CR) was defined as no need for continued medication, uncomplete response (UR) as improved symptoms but need for continued medication, no symptomatic improvement. Result: At the initial evaluation, 15 of 75 (15.0%) exhibited abnormal caloric test results, 9 of 75 patients (12.0%) exhibited abnormal vHIT results. Six months later, 58 of 75 patients (77.3%) no longer required medication (CR), while 17 (22.7%）UR patients need for continued medication. The ratio of abnormal vHIT gain and abnormal caloric results were significantly different between group (CR) and group (UR) ( P <0.05). Conclusion: Abnormal vHIT and caloric test results revealed semicircular canal dysfunction in VM patients, peripheral vestibular abnormalities are closely related to the development of vertigo in VM patients and predicted prolonged preventive medication and vestibular rehabilitation requirement.