Neural response thresholds in the Nucleus Contour cochlear implant before and after stylet removal.
CONCLUSIONS
The study shows that there are differences in the measurement of the action potentials with and without the stylet in the Nucleus Freedom Contour Advance that are higher in the apex than in the base of the cochlea.


OBJECTIVE
To determine if there are differences in the intraoperative impedances and in the neural response telemetry threshold values in the Nucleus Freedom Contour Advance before and after stylet removal.


METHODS
This was a prospective clinical study. Intraoperative impedances and neural response telemetry in users of the Freedom Contour Advance Cochlear Implant were measured before and after stylet removal.


RESULTS
There was a significant reduction in the impedance values of an average 1.5 kOmega+/-2.3 in common ground mode and 1.3 kOmega+/-2.3 for all monopolar modes after the stylet removal (p < 0.001). When analyzing the apical, medium, and basal electrodes, there was a statistically significant reduction in the neural response thresholds after stylet removal only in the apical electrodes (p = 0.001).
ENT Department, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, rua Capote Valente 432, São Paulo, Brazil. rktsuji@uol.com.br
Robinson Koji
RK
Tsuji
Maria Valéria Schmidt
MV
Goffi-Gomez
Cristina Ornelas
CO
Peralta
Mariana Cardoso
MC
Guedes
Ana Tereza
AT
Magalhães
Rubens Brito
RB
Neto
Ricardo Ferreira
RF
Bento
D000200:Action Potentials / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold / Q000502:physiology*; D002648:Child; D002675:Child, Preschool; D003054:Cochlear Implants; D003056:Cochlear Nerve / Q000503:physiopathology*; D003638:Deafness / Q000151:congenital / Q000503:physiopathology* / Q000534:rehabilitation*; D017097:Electric Impedance; D004567:Electrodes, Implanted; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017084:Otoacoustic Emissions, Spontaneous / Q000502:physiology; D011446:Prospective Studies; D011474:Prosthesis Design; D013686:Telemetry; D055815:Young Adult