Brantberg Krister, Mathiesen Tiit
Department of Audiology, Karolinska Hospital, Stockholm, Sweden.
J Vestib Res. 2004;14(4):347-51.
Sound and skull-tap induced vestibular evoked myogenic potentials (VEMP) were studied in a 43-year-old man following inferior vestibular neurectomy. Surgery was performed because of a small acoustic neuroma. Postoperative caloric testing suggested sparing of superior vestibular nerve function on the operated side. In response to sound stimulation there were no VEMP on the operated side, irrespective of whether sounds were presented by air- or bone-conduction. This suggests sound-induced VEMP to be critically dependent on inferior vestibular nerve function and this is in agreement with present knowledge. However, VEMP were obtained in response to forehead skull taps, i.e. positive-negative VEMP not only on the healthy side but also on the operated side. This suggests remnant vestibular function on the operated side of importance for forehead skull tap VEMP, because with complete unilateral vestibular loss there are no (positive-negative) VEMP on the lesioned side. Thus, forehead skull-tap VEMP depend, at least partly, on the superior vestibular nerve function.
在一名43岁男性接受前庭下神经切除术后，研究了声音和颅骨轻敲诱发的前庭诱发肌源性电位（VEMP）。手术是由于患有小型听神经瘤而进行的。术后冷热试验表明手术侧的前庭上神经功能得以保留。对声音刺激的反应是，手术侧无论声音是通过气导还是骨导呈现，均未引出VEMP。这表明声音诱发的VEMP严重依赖于前庭下神经功能，这与现有知识相符。然而，对前额颅骨轻敲有反应可引出VEMP，即不仅在健康侧，而且在手术侧均引出了正负VEMP。这表明手术侧残留的前庭功能对前额颅骨轻敲VEMP很重要，因为完全单侧前庭丧失时，病变侧不会出现（正负）VEMP。因此，前额颅骨轻敲VEMP至少部分依赖于前庭上神经功能。
