Int Arch Otorhinolaryngol 2015; 19(01): 010-015
DOI: 10.1055/s-0034-1372509
Original Research
Thieme Publicações Ltda Rio de Janeiro, Brazil

Intraoperative Neural Response Telemetry and Neural Recovery Function: a Comparative Study between Adults and Children

Bettina Carvalho
ENT Department, Instituto Paranaense de Otorrinolaringologia - IPO, Curitiba, Brazil
,
Rogerio Hamerschmidt
ENT Department, Instituto Paranaense de Otorrinolaringologia - IPO, Curitiba, Brazil
,
Gislaine Wiemes
Department of Fonoaudiology, IPO, Curitiba, Brazil
› Author Affiliations
Further Information

Publication History

10 December 2013

11 February 2014

Publication Date:
02 April 2014 (eFirst)

Abstract

Introduction Neural response telemetry (NRT) is a method of capturing the action potential of the distal portion of the auditory nerve in cochlear implant (CI) users, using the CI itself to elicit and record the answers. In addition, it can also measure the recovery function of the auditory nerve (REC), that is, the refractory properties of the nerve. It is not clear in the literature whether the responses from adults are the same as those from children.

Objective To compare the results of NRT and REC between adults and children undergoing CI surgery.

Methods Cross-sectional, descriptive, and retrospective study of the results of NRT and REC for patients undergoing IC at our service. The NRT is assessed by the level of amplitude (microvolts) and REC as a function of three parameters: A (saturation level, in microvolts), t0 (absolute refractory period, in seconds), and tau (curve of the model function), measured in three electrodes (apical, medial, and basal).

Results Fifty-two patients were evaluated with intraoperative NRT (26 adults and 26 children), and 24 with REC (12 adults and 12 children). No statistically significant difference was found between intraoperative responses of adults and children for NRT or for REC's three parameters, except for parameter A of the basal electrode.

Conclusion The results of intraoperative NRT and REC were not different between adults and children, except for parameter A of the basal electrode.