聴神経腫瘍例に対する前庭誘発筋電位検査の有用性
2004 年 63 巻 4 号 p. 353-360
詳細
2004 年 63 巻 4 号 p. 353-360
Vestibular evoked myogenic potential (VEMP) is a biphasic response which is recorded over the ipsilateral sternocleidomastoid muscle following intense sound stimulation. VEMP has potential as a new functional test of the saccular and inferior vestibular nerve tracts. In this report, VEMP, caloric response, and auditory brain stem response (ABR) were analyzed in 21 patients (10 male and 11 female; mean age, 57.2 years) with acoustic neuroma to evaluate the clinical usefulness of the VEMP test. In the VEMP examination, intense clicks (100 dBnHL) were delivered at a stimulation rate of 5 Hz. Two hundred responses were averaged. Sixteen of the 21 patients (76.2%) showed abnormal VEMPs on the affected side. Twelve of these 16 patients (75.0%) had abnormal caloric responses on the affected side. Two of the 4 patients with normal caloric responses showed abnormal VEMPs. Of the 8 patients who were excluded from the evaluation of ABRs because of profound sensorineural hearing loss, 7 showed abnormal VEMPs. Four of the 13 patients with abnormal ABRs showed normal VEMPs. These results suggest that the measurement of VEMP in addition to caloric response and ABR might provide greater precision in the screening of acoustic neuroma.
