Paranasal Sinus CT and Polysomnographic Findings in Adults with Cystic Fibrosis: Implications for Obstructive Sleep Apnea.

OBJECTIVE: To assess whether chronic rhinosinusitis (CRS) severity is associated with obstructive sleep apnea (OSA) in adult people with cystic fibrosis (pwCF). METHODS: We conducted a retrospective single-center study of 44 adults with CF who underwent overnight polysomnography (PSG), Epworth Sleepiness Scale (ESS) assessment, and sinus computed tomography (CT). CRS severity was quantified using the Lund-Mackay score (LMS) and the main nasal cavity score (MNCS). OSA was defined by Apnea-Hypopnea Index (AHI) thresholds per American Academy of Sleep Medicine criteria. RESULTS: Participants had a mean age of 31.1 ± 8.4 years and a mean percent predicted FEV1 of 51.8 ± 15.7. Sinus CT showed radiological evidence of CRS in all participants. Mean AHI was 5.3 ± 4.4/h; 48% had AHI ≥ 5/h. There were no significant differences between pwCF with and without OSA in age, sex, BMI, lung function, total sleep time, sleep efficiency, or ESS score (all p > 0.05). Mean LMS and MNCS did not differ between OSA and non-OSA groups (both p > 0.05), and neither score correlated with PSG parameters or ESS (all p > 0.05). Receiver operating characteristic (ROC) analysis demonstrated low discriminative ability of LMS and MNCS for predicting OSA (AUCs < 0.70, p < 0.05). CONCLUSIONS: In this cohort of adults with CF, CT-based CRS severity was not associated with OSA. Given the substantial prevalence of OSA observed, PSG screening should be considered irrespective of CRS severity.