NEUROLOGICAL SCIENCES, cilt.35, ss.221-226, 2014 (SCI İndekslerine Giren Dergi)
Vestibular-evoked myogenic potentials (VEMP), short-latency electromyographic responses elicited by acoustic stimuli, evaluate the function of vestibulocollic reflex and may give information about brainstem function. The aim of the present study is to evaluate the potential contribution of VEMP to the diagnosis of multiple sclerosis (MS). Fifty patients with MS and 30 healthy control subjects were included in this study. The frequency of VEMP p1-n1 and n2-p2 waves; mean p1, n1, n2, and p2 latency; and mean p1-n1 and n2-p2 amplitude were determined. The relation between clinical and imaging findings and VEMP parameters was evaluated. The p1-n1 and n2-p2 waves were more frequently absent in MS than in control subjects [p1-n1 wave absent: MS, 25 (25 %) ears; control, 6 (10 %) ears; P a parts per thousand currency sign 0.02] [n2-p2 wave absent: MS, 44 (44 %) ears; control, 7 (12 %) ears; P a parts per thousand currency sign 0.001]. The mean p1-n1 amplitude was lower in MS than in control subjects (MS, 19.1 +/- A 7.2 mu V; control, 23.3 +/- A 7.4 mu V; P a parts per thousand currency sign 0.002). A total of 24/50 (48 %) MS patients had VEMP abnormalities (absent responses and/or prolonged latencies). VEMP abnormalities were more frequent in patients with than without vestibular symptoms (P a parts per thousand currency sign 0.02) and with brainstem functional system score (FSS) a parts per thousand yen1 than FSS = 0 (P a parts per thousand currency sign 0.02). In patients with MS, absence of p1-n1 wave was more frequent in patients with than without vestibular symptoms [absence of p1-n1 wave: vestibular symptoms, 9 (45 %) ears; no vestibular symptoms, 16 (20 %) ears; P a parts per thousand currency sign 0.03] and patients with Expanded Disability Status Scale (EDSS) score a parts per thousand yen5.5 [absence of p1-n1 wave: EDSS a parts per thousand yen5.5, 7 (70 %) ears; EDSS < 5.5, 18 (20 %) ears; P a parts per thousand currency sign 0.001]. Abnormal VEMP may be noted in MS patients, especially those with vestibular symptoms and greater disability. The VEMP test may complement other studies for diagnosis and follow-up of patients with MS.