Objective: to evaluate the effects of isolated nasal surgery in the treatment of Obstructive Sleep Apnea Syndrome (OSAS), through the impact on the reduction of the Apnea-Hypopnea Index (AHI), the Oxygen Desaturation Index (ODI), the minimal peripheric oxygen saturation (SpO2min) and in the results of the Epworth Sleepiness Scale (ESS). Study Design: retrospective cohort study Material and methods: Clinical pro...