title: Vestibular evoked myogenic and periocular potentials after vestibular schwannoma surgery.
abstract: OBJECTIVE
  We analyzed the behavior of preoperative and postoperative vestibular evoked myogenic potentials (VEMPs) and vestibular evoked periocular potentials (VEPPs) in 3 patients who had vestibular schwannoma and underwent modified translabyrinthine surgery.
  
  
  METHODS
  We compared VEMPs and VEPPs, measured with both air-conducted (AC) and bone-conducted (BC) stimulations. Vestibular evoked potentials were measured both in the immediate postoperative period and some months later.
  
  
  RESULTS
  At the immediate postoperative examination, VEPPs were preserved in all 3 patients with both AC and BC stimulations. The VEMPs showed stable or improved parameters in 2 of our patients and were absent in the third patient. At the follow-up examination, VEMPs did not show any significant change with respect to the previous evaluation. In contrast, VEPPs were absent in 2 of our patients with AC stimulation and in 1 patient with BC stimulation.
  
  
  CONCLUSIONS
  Our results seem to indicate a greater stability and reproducibility of VEMPs compared with VEPPs. In 1 patient, who had a schwannoma of the inferior vestibular nerve, the preservation of VEPPs and the absence of VEMPs in the immediate postoperative period confirm that the saccule represents the origin of VEMPs. Furthermore, these results suggest that not only the saccule, but also the utriculus, could be implicated in the origin of VEPPs.
authors.affiliation: Department of Otorhinolaryngology, Audiology and Phoniatrics G. Ferreri, University La Sapienza, Rome, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Magliulo
authors.forename: Donato
authors.initials: D
authors.lastname: Parrotto
authors.forename: Mario
authors.initials: M
authors.lastname: Gagliardi
mesh_terms: D000328:Adult; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000503:physiopathology*; D009464:Neuroma, Acoustic / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery; D011184:Postoperative Period; D014722:Vestibule, Labyrinth / Q000503:physiopathology*