Abstract: Objective: To study the clinical features and surgical curative effect of pediatric obstruction sleep apnea hypopnea syndrome(OSAHS). Methods: Thirty-two cases of pediatric OSAHS, diagnosed by overnight polysomnograph (PSG) were given trans-oral endoscopy-assisted adenoidectomy and/or tonsillectomy. Correlation between the relative sizes of adenoid (AN ratio), tonsils （TP ratio ）and apnea hypopnea index(AHI) were analyzed respectively, and parameters in PSG were compared between pre-and post-operation. Results: AN ratio and TP ratio were positively correlated to AHI. There were no acute obstructions in the airway and no post-operative bleeding and infections in any of the cases during peri-operation. Followingup for 12 to 24 months postoperatively, snoring and open-mouth breathing released, and no nasopharyngeal adherence, residual adenoid or eustachian tube dysfunction were found. AI, AHI, the lowest oxygen saturation and the longest time of apnea and hypopnea were improved significantly after the operation. Conclusion: Adenoids and tonsil hypertrophy are major contributions to pediatric OSAHS, and adenoidectomy and/or tonsillectomy are the effective treatments. Trans-oral endoscopy-assisted adenoidectomy has the advantages as good visualization, complete removal and minimal damage.

Key words: Sleep apnea, obstructive, Tonsil, Adenoidectomy, Polysomnograph, Children