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Neural response thresholds in the Nucleus Contour cochlear implant before and after stylet removal.
Acta Otolaryngol. 2009 Nov;129(11):1330-6

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Neural response thresholds in the Nucleus Contour cochlear implant before and after stylet removal.

Tsuji RK, Goffi-Gomez MV, Peralta CO, Guedes MC, Magalhães AT, Neto RB, Bento RF.

Abstract
CONCLUSION: 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.
OBJECTIVES: 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.
SUBJECTS AND 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).