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

Measurement of electrically evoked stapedial reflexes with variable stimulation rate

Meeting Abstract

  • corresponding author T. Kortmann - Universitätsklinikum, Kiel
  • J. Müller-Deile - Universitätsklinikum, Kiel
  • A. Morsnowski - Universitätsklinikum, Kiel

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. Doc05omci046

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

Published: May 31, 2005

© 2005 Kortmann 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.



In patients with cochlear implant it is possible to cause stapedial reflexes by electrical stimulation of single electrodes. In our setup, the speech processor with the CI-24M system, controlled by the NIC (Nucleus) excites with various stimulation parameters. The change of acoustical compliance is being measured with an impedance audiometer. A trigger pulse is generated synchronously to the electrical stimulation and allows to determine the reflex latency. In our study, one basal, medial or apical electrode are tested with stimulation rates of 250, 500, 900, 1200 and 1800 Hz each. Reflex thresholds and amplitude growth functions are measured and compared to subjective loudness scaling.