The Thermal Damage of Canine Vocal Fold by CO2 Laser Under Different Laser Emission Mode

xlomafota13 shared this article with you from Inoreader The Thermal Damage of Canine Vocal Fold by CO<sub>2</sub> Laser Under Different Laser Emission Mode Via ear nose throat Ear Nose Throat J. 2021 Mar 15:145561321999262. doi: 10.1177/0145561321999262. Online ahead of print. ABSTRACT OBJECTIVE: The purpose of this study is to review the differences between continuous wave (CW) and UltraPulse (UP) on thermal damage of the laser with different power. METHODS: Four adult beagle dogs underwent transoral laser microsurgery (TLM) using CO2 laser. The laser emission mode and power was CW (3 W, 5 W, and 8 W) and UP (3 W and 5 W), respec tively. The tissue from 4 animals was evaluated histologically on postoperative days 1 and 3. The thermal damage of the laser was measured using slide scan system via SlideViewer version 1.5.5.2 software. RESULTS: All dogs underwent TLM uneventfully. Under microscope examined, the laser damage area was composed of 2 parts: the vaporized zone (VPZ) and thermal damage area. The thermal damage area can be divided into thermal coagulative necrosis area (TCN) and hydropic degeneration area. The width of VPZ and TCN in UP mode was less than that in CW mode (P < .01). The data indicate that lower laser power created less thermal damage (P < .01). In addition, the width of VPZ on postoperative day 3 was less than that on postoperative day 1 (P < .01). CONCLUSION: CO2 laser with UP and lower power could decrease the laser thermal damage and may offer more prompt wound healing. PMID:33719628 | DOI:10.1177/0145561321999262 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.