gms | German Medical Science

Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants

Medical University of Hannover

01.06. bis 04.06.2005, Hannover

Correlation Between NRT And Subjective Thresholds

Meeting Abstract

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  • corresponding author S. Razza - Servizio di Audiovestibologia, Ospedale di Circolo di Varese, Varese, Italy
  • S. Burdo - Fondazione Audiologica Varese onlus, Varese, Italy
  • L. Carlini - Fondazione Audiologica Varese onlus, Varese, Italy
  • G. Tognola - Istituto di Ingegneria Biomedica, CNR, Milan, Italy

Medical University of Hannover, Department of Otolaryngology. Fourth International Symposium and Workshops: Objective Measures in Cochlear Implants. Hannover, 01.-04.06.2005. Düsseldorf, Köln: German Medical Science; 2005. Doc05omci086

The electronic version of this article is the complete one and can be found online at:

Published: May 31, 2005

© 2005 Razza et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.



Each cochlear implant must be fitted for the single patient in order to properly activate the fibers of the cochlear nerve. The map represents the personalization of the system for each subject: the patient's communicative performance will depend on this map. Clinically two methods are used to build a map: the subjective psychoacoustic response or/and the objective electrophysiological thresholds. An objective method to evaluate the thresholds is the NRT (Neural Response Telemetry), that is the electrical equivalent of the electrocochleography. Considering the main clinical application of the NRT, that is the knowledge of the T and C level in non-cooperating subjects, we evaluated the reliability of these methodology considering the results in 50 experienced patients divided into two groups: the first with straight electrode array (CI24M), the second with perimodiolar array (CI24 Contour).