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Background and Objectives:Click-evoked myogenic potentials have been used as a clinical test of the vestibulospinal reflex (VSR)test, so its use has been limited. We compared the parameters of VEMP among the normal and vestibulopathy patients and clarified the diagnostic value of each parameter. Materials and Method:We compared the results of VEMP conducted in 14 healthy volunteers and 35 patients who had been diagnosed with unilateral vestibulopathy by the vestibular function test (VFT). As parameters of VEMP, latency, amplitude and interlatency were compared betwen the two groups. We got positive findings of VEMP according to each parameter. Results:Twenty-four percent of the patients showed normal VEMP findings, but seventy-five percent of that patients showed abnormal findings. Absent VEMP formation, prolonged latency, especialy p13, and dec-reased amplitude (increased VEMP asymmetry) were shown in significant proportions of the patients. Conclusion:VEMP is a clinicaly complementary diagnostic method of VFT for dizzy patients. Prolonged peak latency and increased VEMP asymmetry are diagnostically valuable in the evaluation of that test. (Korean J Otolaryngol 203 ;46 :391-5)