[The recovery study of excising the different range of dog's anterior commissure by semiconductor laser].
OBJECTIVE
To explore the effective method to treat the glottic carcinoma invading the anterior commissure, we observed the difference of three kinds of operation to the anterior commissure of dogs by semiconductor laser.


METHODS
Twelve dogs were divided into 3 groups at random, A: to cauterize to the thyroid cartilage's inner membrane of the anterior commissure, the right ventricular bands and vocal cord, the anterior and 1/3 of the left vocal cord; B: to cauterize part of the thyroid cartilage of the anterior commissure besides A; C: to open a window about 5 mm x 5 mm on the thyroid cartilage of the anterior commissure besides B. To take photos to observe the dogs' laryngeal wound with digital camera or electrolaryngoscope immediately, 1 week and 4 weeks, then to record the hoarseness, body weight and complications etc.


RESULTS
All the dogs' laser surgery were completed successfully. To observe the gross specimen, it was identical between the extent of excising and the design preoperation. One week later, the neonatal membrane covered the wound incomplete. Edematization, inflammatory reaction, pseudomembrane and the hoarseness were not heavy too. No obvious complication in group A. The neonatal membrane covered the wound incomplete. Edema, inflammatory reaction, pseudomembrane and granulation can be seen in group B. Exudation was heavy in local, erosion and infected, the hoarseness was severe. No other obvious complications in C. Different extent of adhesion could be seen at the anterior commissure in group A, B and C after 4 weeks, the laryngeal web formed, and the length of vocal cord was shorter than before. The color and luster of anterior commissure membrane was normal basically, the inflammatory reaction was not heavy in A and B groups. The anterior commissural membrane appeared the dark red chronic inflammatory reaction; the window was closed by neonatal membrane completely and had no infection in group C. To observe the gross specimen: the wound of anterior commissure was covered by prosthetic epithelia completely in three groups. The window was closed by complete membrane at the anterior commissure. The No. 1- 3 dog's conditions of hoarseness in three groups after 4 weeks: slight in A group, little severe in B and C group. The change of weight was not obvious at the pre or postoperative in group A and B. No obvious complication happened in each group postoperation.


CONCLUSIONS
The three operative methods have satisfied effects,the recovery of wound can cure well finally and no severe complications happened. It is valuable in clinic.
Sun
Guangbin
G
Department of Otolaryngology, Gongli Hospital, Pudong New Area, Shanghai, 200135, China. sgb223@hotmail.com
Tang
Haihong
H
Fang
Qin
Q
Liang
Gengtian
G
Xu
Limin
L
Huang
Yideng
Y
D000818:Animals; D001193:Arytenoid Cartilage / Q000601:surgery*; D004285:Dogs; D007830:Larynx / Q000601:surgery; D053685:Laser Therapy / Q000379:methods*; D054023:Lasers, Semiconductor; D013957:Thyroid Cartilage / Q000601:surgery*; D014827:Vocal Cords / Q000601:surgery*