Effects of diode laser setting for laryngeal surgery in a rabbit model.

Abstract

To study the damaging effect of different diode laser settings on vocal folds 7 days after injury in a rabbit model. Twenty-one male New Zealand white rabbits were randomized into three groups with seven animals per group. A 980-nm diode laser was used to create a single spot injury in each vocal fold. Different modulation frequencies (10Hz versus 1000Hz) in pulsed mode, different powers (3W versus 5W), and distinct wave modes of radiation (pulsed versus continuous) were compared. The extent of the inflammatory infiltrate and ablation crater were greater when using 5-W optical power compared with 3W. The extent and depth of the inflammatory infiltrate, and the width and depth of the ablation crater were greater with continuous wave mode compared with pulsed mode. The density of collagen fibers only increased when using the laser in continuous wave mode. The use of the 980-nm diode laser with an output power of 5W produced an increased extent of thermal injury compared to an output power of 3W and, more importantly, using continuous rather than pulsed wave mode significantly increased the extent and depth of thermal injury in rabbit vocal folds.