Tuberc Respir Dis.  1989 Sep;36(3):222-232. 10.4046/trd.1989.36.3.222.

Defferences in the Effects of Neodymium-Yttrium Aluminum Garnet Laser According to the Colors of Irradiated Materials in Tracheobronchial Tree

• KMID: 2528544
• DOI: http://doi.org/10.4046/trd.1989.36.3.222

Abstract

Although Nd- YAG laser surgery is a very effective treatment-modality to reopen malignant airway obstruction, fatal complications such as perforations of airway and intrathoracic great vessels were reported and these complications were due to excess of irradiation dosage and/or many factors affecting laser effects Considering N d- Y AG laser is an light energy with its own wavelength (1064 nm), it might be expected that laser.induced tissue damage and safe dosage may be different according to the color of the target tissue. And there is variety of color in malignant tissue of tracheobronchial tree,ie, reddish hemorrhage, blackish anthracosis, whitish necrosis or natural-colored tumor. An experiment was performed to determine the chromatic effects of Nd- Y AG laser using colored papers, porcine tracheas and esophagi. Eight kinds of colored papers-ivory, red, orange, yellow, green, blue, vi 이 et and black-were irradiated with 1-50 J of Nd- Y AG laser with 90. of radiation angle in 5 mm distance between laser tip and papers, and porcine tracheas and esophagi were also irradiated with 5-495 J of Nd-YAG laser by the same manner as used in papers after were stained with congo red, methylene blue and black ink. The effects of Nd- Y AG laser were analyzed according to the colors of irradiated materials. In colored papers, the damage was most maked in black followed by blue, violet, green, yellow, orange, red, and ivory in the same dosage of laser irradiation (p < 0.01). And in porcine tracheas and esophagi, the tissue damage was also most marked on blackish stained tissue followed by blue, red and natural color(p < 0.01). It is concluded that the tissue damage by Nd- Y AG laser irradiation is dependent on the color of target tissue and the degree of damage is relatively reciprocal to wavelength of color itself. And the safe dosage of N d- Y AG laser in tracheobronchial tree should be changed according to the color of irradiated tissue.