International Session 33　　 Broncho-esophagology and Larynx

Purpose: After the discontinuation of the potassium titanyl phosphate(KTP)laser, a novel 445-nm blue laser was developed in laryngeal surgery.The balance between a desired tissue effects and collateral tissue damage is crucial for laser selection.The shell-less incubation system for the chick chorioallantoic membrane(CAM)simulates the microvasculature of the vocal fold and is useful for testing effects of laser.The aim of this study is to compare the tissue effects of the KTP and blue lasers using the shell-less CAM model.Methods: The model contains polymethylpentene film, calcium lactate and distilled water supplementations.The effects of the 2 lasers were quantified at clinically relevant energy settings and laser distances from target.Measures included imaging real-time vascular reactions in the CAM model, post-procedure histologic analysis of CAM tissue and temperature changes.Results: The blue laser has less vessel coagulation and rupture rates, less tissue disruption and less temperature changes.Conclusion: In the CAM model, the blue laser reveals less tissue damage.Suitable working distance and power setting of the laser are necessary for desired tissue effects.