From a number of medically useful
lasers, mainly the
neodymium YAG and the
carbon dioxide laser are employed in otorhinolaryngology. Until now, the
neodymium YAG laser has been used only for coagulation of vessels in Osler's disease and for
palliative treatment of malignant tracheo-oesophageal disease. However, the deep coagulation
necrosis of the adjacent tissues severely restricts its use. The most widely utilised
laser in ENT surgery is the
carbon dioxide laser. Its main effect of precise cutting with an extremely fine zone of coagulation reduces
bleeding after incision considerably. Secondary tissue reactions, delayed healing, decreased fibroblast activity and maybe more prominent subepithelial
scarring, limit its use especially in the glottic region. Therefore, minor vocal cord alterations such as vocal nodules,
cysts or
polyps suitable for excision with scissors, should not be removed by
laser. Optional indications are Reinke's oedema, intubation
granulomas and contact pachydermas. Clear advantages of
laser use are seen in the treatment of juvenile
papillomas of the vocal fold and of smaller vocal cord
carcinomas or recurrences after irradiation therapy of these. The
carbon dioxide laser is superior to all other indications in the removal of large and obstructing laryngeal
carcinomas to prevent
tracheostomy. Very reliable is its use in the ablation of lingual tonsillar tissue to improve or eliminate symptoms in recurrent lingual
tonsillitis. Transoral resection of small malignant lesions in the oral and pharyngeal cavity may be performed in analogy to electric
cautery. The advantages of the
laser compared to electrical surgery are a smaller postoperative oedema and less
pain, as well as good spontaneous epithelialisation of defects.(ABSTRACT TRUNCATED AT 250 WORDS)