Int. Adv. Otol. 2010; 6(2); 206-210

Vestibular Evoked Myogenic Potential in Cases of Vestibular Schwannomas
Hani El Garem, Rania l Gafy, Mona Mourad, Mamdouh Talaat
University of Alexandria, Alexandria, Egypt

Objectives: The aim of this study is to record the VEMP changes that occur in patients with vestibular schwannoma to assess vestibulospinal reflexes.

Material and Methods: This study was carried on fifteen patients with vestibular schwannoma. Fifteen persons not suffering from any vestibulo-cochlear problem were subjected to VEMP recordings as controls.

Results: In this study, 3 patients (20%) had no VEMP waves on the affected side (but the waves were preserved on the other side), 11 patients (73.4%) had no VEMP waves bilaterally, and 1 patient (6.6%) had VEMP waves preserved on both sides As for the latencies of p1, n1 waves and peak to peak amplitude variation, VEMP could be elicited only in 4 patients (26.8%). There was a significant difference between the patients and controls in regard to mean p1 and n1 latencies but there was no significant difference between the peak amplitudes of patients and controls.