[Effect of septoplasty and turbinectomy on obstructive sleep apnea syndrome]

Obstructive sleep apnea syndrome (OSAS) is thought to be closely related to nasal airway resistance, which accounts for approximately one half of total upper airway resistance. This retrospective study aimed at elucidating the effect of endoscopic endonasal surgery on OSAS. Nine consecutive patients with OSAS complaining of nasal obstruction who underwent endoscopic endonasal surgery were enrolled. They were 8 men and 1 woman ranging from 34-73 years of age with an average of 53.2 years. All patients had chronic hypertrophic rhinitis and nasal septal deviation, and underwent septoplasty and submucous turbinectomy. The severity of OSAS was assessed by 8 sleep apnea indices of polysomnography before and after surgery. The indices included the apnea-hypopnea index (AHI), maximum apnea time, mean apnea time, minimum blood oxygen saturation, mean blood oxygen saturation, blood oxygen saturation decline index, awakening response index, and ratio of snoring time to sleep time. Significant decrease in the AHI (27.6 +/- 5.3 vs. 20.7 +/- 5.5/hr; p = 0.033), in the awakening response index (30.5 +/- 3.3 vs. 21.2 +/- 5.3/hr; p = 0.028), and increase in the mean blood oxygen saturation (95.1 +/- 0.7 vs. 96.0 +/- 0.7%; p = 0.023) were observed postoperatively. There was no significant change in the other 5 indices. In addition, nasal airflow resistance measured by acoustic rhinometry had significantly reduced during the periods of both inhalation (474.4 +/- 49.0 vs. 842.7 +/- 50.2cm3/s; p = 0.002) and exhalation (467.3 +/- 57.3 vs. 866.0 +/- 80.6 cm3/s; p = 0.004). The pre- and postoperative body mass indices did not differ statistically from each other. These results indicate that endoscopic endonasal surgery alone has a potential effect on sleep-disordered breathing in OSAS patients with nasal obstruction. We should be aware of such a positive impact of endonasal surgery upon the management of OSAS.