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  • Title: Diagnostic value of prolonged latencies in the vestibular evoked myogenic potential.
    Author: Murofushi T, Shimizu K, Takegoshi H, Cheng PW.
    Journal: Arch Otolaryngol Head Neck Surg; 2001 Sep; 127(9):1069-72. PubMed ID: 11556854.
    Abstract:
    BACKGROUND: As a parameter for the evaluation of the vestibular evoked myogenic potential (VEMP), amplitude has been used clinically. However, the significance of latency has not been considered. OBJECTIVE: To clarify the diagnostic value of latencies of the VEMP. DESIGN: We reviewed records of the VEMP of patients with various diseases and compared them with records of healthy volunteers. SETTING: Data were collected from patients in an outpatient clinic of a tertiary care center and healthy volunteers. SUBJECTS: Clinical records of 134 patients (61 men and 73 women, aged 20-75 years) were reviewed. Diagnoses were Meniere disease in 43 patients, acoustic neuroma in 62 patients, vestibular neuritis in 23 patients, and multiple sclerosis in 6 patients. Also, 18 healthy volunteers (13 men and 5 women, aged 25-38 years) were enrolled. INTERVENTION: Diagnostic. MAIN OUTCOME MEASURES: Click-evoked myogenic potentials were recorded with surface electrodes over each sternocleidomastoid muscle. Latencies and amplitudes of responses were measured. RESULTS: Vestibular evoked myogenic potentials were absent or decreased in 51% of patients with Meniere disease (n = 22), 39% with vestibular neuritis (n = 9), 77% with acoustic neuroma (n = 48), and 25% with multiple sclerosis (3 of 12 sides of 6 patients). Concerning latency, patients with Meniere disease or vestibular neuritis hardly showed any latency prolongation. Four patients with acoustic neuroma showed prolonged p13; all had large tumors. All patients with multiple sclerosis showed prolonged p13. CONCLUSION: Prolonged latencies of the VEMP suggest lesions in the retrolabyrinthine, especially in the vestibulospinal tract.
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