Vestibular evoked myogenic potentials of children with inner ear malformations before and after cochlear implantation.
CONCLUSIONS
Our results show that among the patients with inner ear malformations, there were two patients with sensory cells of sacculus and inferior vestibular neurons and at least five patients with inferior vestibular neurons only, but no patients without sensory cells and vestibular neurons, as determined on the basis of vestibular evoked myogenic potentials (VEMPs).


OBJECTIVE
The aim of this study was to investigate whether sensory cells of sacculus or inferior vestibular neurons or both are present in cochlear implant patients with inner ear malformations, particularly common cavity (CC) deformity, using VEMPs.


METHODS
Seven children with inner ear malformation who underwent cochlear implantation (CI) participated in this study. The patients had CC deformity (n=2), incomplete partition type I (n=2), incomplete partition type II (n=1), or a narrow internal auditory canal (IAC) (n=2). It was possible to record VEMPs before and after CI in three patients and not before but after CI in four patients. After surgery, VEMPs were recorded with the cochlear implant device switched both off and on.


RESULTS
Before the CI, two patients showed VEMPs and one patient showed no VEMPs, whereas in four patients no VEMPs could be recorded. All the patients showed VEMPs with the cochlear implant on.
National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Tokyo, Japan.
Yulian
Y
Jin
Yukiko
Y
Shinjo
Yusuke
Y
Akamatsu
Tatsuya
T
Yamasoba
Kimitaka
K
Kaga
D000344:Afferent Pathways / Q000503:physiopathology; D002150:Caloric Tests; D002648:Child; D002675:Child, Preschool; D019929:Cochlear Implantation; D003054:Cochlear Implants; D003638:Deafness / Q000503:physiopathology*; D007758:Ear, Inner / Q000002:abnormalities* / Q000503:physiopathology / Q000601:surgery; D004576:Electromyography; D004584:Electronystagmography; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005260:Female; D054777:Hair Cells, Ampulla / Q000502:physiology; D006801:Humans; D008297:Male; D009334:Neck Muscles / Q000294:innervation; D009474:Neurons / Q000502:physiology; D010037:Otolithic Membrane / Q000503:physiopathology; D004856:Postural Balance / Q000502:physiology; D011474:Prosthesis Design; D011930:Reaction Time / Q000502:physiology; D012016:Reference Values; D012444:Saccule and Utricle / Q000503:physiopathology; D012665:Semicircular Canals / Q000503:physiopathology; D014057:Tomography, X-Ray Computed; D014724:Vestibular Function Tests; D014725:Vestibular Nerve / Q000503:physiopathology