Presented at the Triological Society Combined Sections Meeting, Miami Beach, Florida, U.S.A., January 26–28, 2012.
Article first published online: 23 MAR 2012
Copyright © 2012 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 122, Issue 5, pages 1142–1147, May 2012
How to Cite
Cipolla, M. J., Iyer, P., Dome, C., Welling, D. B. and Bush, M. L. (2012), Modification and comparison of minimally invasive cochleostomy techniques: A pilot study. The Laryngoscope, 122: 1142–1147. doi: 10.1002/lary.23231
The authors have no other funding, financial relationships, or conflicts of interest to disclose.
- Issue published online: 18 APR 2012
- Article first published online: 23 MAR 2012
- Accepted manuscript online: 1 FEB 2012 01:21AM EST
- Manuscript Accepted: 11 JAN 2012
- Manuscript Revised: 4 JAN 2012
- Manuscript Received: 9 DEC 2011
- hybrid electrode;
- cochlear implant;
- CO2 laser;
- hearing preservation;
- Level of Evidence: V
Bimodal stimulation may offer improved auditory function following cochlear implantation. Modification of technique during cochleostomy may minimize trauma and maximize residual hearing. We hypothesize that CO2 laser use during cochleostomy is useful and may decrease intracochlear trauma. This study examines the utility of CO2 laser to perform cochleostomy and compares intracochlear sound and temperature levels during laser and drill usage.
Experimental (30 cadaveric temporal bones).
A CO2 laser at 3 W (four bones) and 6 W (four bones) and otologic drill (six bones) were utilized to perform a cochleostomy while recording operative time. Subsequently, 16 bones were used to simultaneously record intracochlear sound (in decibels) and temperature (in degrees Fahrenheit) during CO2 laser (eight bones) and drill cochleostomies (eight bones).
Average cochleostomy time for CO2 laser was 15.5 minutes (3 W) and 7.75 minutes (6 W); it was 8 minutes for the drill. Average intracochlear sound level was 54.9 dB during laser use and 89.9 dB during drill use (P < .001), whereas maximal levels were 75 to 118 dB during laser use and 95 to 136 dB during drill use (P = .018). Average temperature was 63.4°F during laser use and 61.5°F during drill use (P = .151), whereas maximum temperatures ranged from 66 to 120°F during laser use and 62 to 70°F during drill use (P = .045).
CO2 laser can create cochleostomies comparable in operative time and intracochlear temperature to drilling while decreasing intracochlear sound levels. Further investigation is warranted to minimize trauma and maximize auditory function during cochleostomy.