Comparison of the use of tympanic and extratympanic electrodes for electrocochleography
Article first published online: 23 FEB 2009
Copyright © 2009 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 119, Issue 3, pages 563–566, March 2009
How to Cite
Bonucci, A. S. and Hyppolito, M. A. (2009), Comparison of the use of tympanic and extratympanic electrodes for electrocochleography. The Laryngoscope, 119: 563–566. doi: 10.1002/lary.20105
- Issue published online: 23 FEB 2009
- Article first published online: 23 FEB 2009
- Manuscript Accepted: 29 NOV 2008
To determine the differences between tympanic and extratympanic electrodes regarding recording technique, comfort and ease of execution of the exam, and quality of auditory potential tracings.
Prospective cross-section investigation.
Determination of the summation potential/action potential (SP/AP) ratio by electrocochleography (EchoG) using tympanic and extratympanic electrodes and separate analysis of SP and AP regarding the amplitude recorded.
Twenty-three subjects (15 men and 8 women; mean age: 33.17 years) with normal tonal threshold audiometry were evaluated. EchoG analysis revealed no significant difference between the two tympanic electrodes. Eleven of the 23 subjects reported discomfort with the insertion of the tympanic electrode even with the use of topical xylocaine, whereas no complaints of discomfort were reported with the use of the extratympanic electrode.
Both electrodes were effective for EchoG evaluation, but the extratympanic one was easier to insert and did not cause discomfort. However, the tympanic electrode produced tracings of greater amplitude and of better reproducibility. Laryngoscope, 119:563–566, 2009