Peter Valentin Tomazic MD, and Georg Philipp Hammer, MD, contributed equally to this article.
Heat development at nasal endoscopes' tips: Danger of tissue damage? A laboratory study†
Article first published online: 3 MAY 2012
Copyright © 2012 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 122, Issue 8, pages 1670–1673, August 2012
How to Cite
Tomazic, P. V., Hammer, G. P., Gerstenberger, C., Koele, W. and Stammberger, H. (2012), Heat development at nasal endoscopes' tips: Danger of tissue damage? A laboratory study. The Laryngoscope, 122: 1670–1673. doi: 10.1002/lary.23339
The authors have no funding, financial relationships, or conflicts of interest to disclose.
- Issue published online: 25 JUL 2012
- Article first published online: 3 MAY 2012
- Accepted manuscript online: 5 APR 2012 05:05AM EST
- Manuscript Accepted: 12 MAR 2012
- Manuscript Revised: 8 MAR 2012
- Manuscript Received: 30 JAN 2012
- temperature curves;
- nasal endoscopes;
- light source;
- safety profile
The aim of this study was to measure the temperature generated by light sources in conjunction with angulated endoscopes and to analyze whether the heat generated at the endoscopes' tips harbors potential damage to mucosa or highly sensitive structures like the optic nerve or brain when in direct contact, considering a beginning necrosis of human protein starting at 40°C.
Laboratory setting, prospective.
Brand new 4-mm, 0° and 30° rigid nasal endoscopes were measured each with halogen, xenon, and light-emitting diode (LED) light sources, respectively, at different power levels for tip contact temperature.
The highest temperatures were reached with a xenon light source at a maximum of 44.3°C, 65.8°C, and 91.4°C at 33%, 66%, and 100% power levels, respectively, for 4-mm, 0° endoscopes. For 30° endoscopes, temperatures of 47.0°C, 75.1°C, and 95.5°C were measured at 33%, 66%, and 100% power levels (P < .001; 0° vs. 30°), respectively. At 5-mm distance from the tip, temperatures were below body temperature for all light sources (<36°C) at all power settings. Within 2 minutes after switching off light sources, temperatures dropped to room temperature (22°C).
Xenon light sources have the greatest illumination potential; however, at only 33% power level, potentially harmful temperatures can be reached at the tips of the endoscopes. Power LED and halogen have the highest safety; however, only LED has very good illumination. In narrow corridors, direct contact to tissues or vital structures should be avoided, or endoscopes should be cooled during surgical procedures.