The Long-Term Safety of Budesonide for Patients With Chronic Rhinosinusitis

Sinusitis

ACTH-axis, Budesonide, MAD, INSI, Intraocular pressure, Bone density

Chronic Rhinosinusitis (CRS) is a common disorder of the nose. The current practice at St Paul's Sinus Centre is to prescribe budesonide via the mucosal atomization device or impregnated saline irrigation. Both have shown to be a safe method of administration. A previous study demonstrated a 6% elevation in intraocular pressure and 3% prevalence of asymptomatic AdrenoCorticoTropic Hormone-Axis (ACTH) suppression. However, a baseline measurement was not conducted to ascertain the correlation of these findings with the medication. Therefore, the investigators aim to conduct baseline measurements of IntraOcular Pressure (IOP), ACTH-axis function, and Dual Energy X-ray Absorptiometry (DEXA) scan and obtaining regular measurements of these variables within a 12-month period to further ascertain these previous findings.

Purpose: The purpose of this study is to assess the long-term effects of budesonide via MAD (Mucosal Atomization Device) or INSI (Intranasal Saline Irrigation) on intraocular pressure, ACTH-axis function, and bone-density. Hypothesis: Budesonide delivered via MAD or INSI will be safe in the long-term (\> 12 months) demonstrated objectively via IOP, ACTH stimulation test, and DEXA scan. Justification: The safety profile of both MAD and INSI has been widely studied in the literature. Although both modalities are generally considered safe, several studies have demonstrated asymptomatic hypothalamic-pituitary-adrenal axis (HPAA) suppression when used in the long-term. A cross-sectional study at St Paul's Sinus Centre, found 3% of study participants on long-term maintenance treatment via MAD to have asymptomatic HPAA suppression. However, the cross-sectional study design limited the ability to ascertain the timeline for this adverse event. Although the recent cross-sectional study at St Paul Sinus Centre was the first to study the long-term effects of budesonide via the MAD in CRS patients, it did not include baseline levels of HPAA function and IOP levels which served as a limitation to ascertaining the timeline of the aforementioned adverse events. Additionally, there is currently limited data on the effects of INCS on bone function in the setting of CRS treatment. Therefore, this study aims to prospectively assess the long-term effect of high-dose nasal corticosteroids (i.e. INSI and MAD) in CRS patients. The study design will obtain baseline measurements of ACTH function, IOP measurement, and a DEXA scan to identify and describe the timeline of adverse events should they develop during the 12-month study period. By determining the impact of nasal corticosteroids on these outcomes, potential improvements can be made in the safety monitoring practices of otolaryngologists. This may include more frequent monitoring of intraocular pressure, Bone Mineral Density (BMD), and HPAA-axis function in at-risk populations, development of budesonide tapering guidelines, and improved screening of patient-reported adverse events. Overall, the investigators hope the results from this study will be a step forward in the development of screening guidelines for monitoring patients on long-term IntraNasal CorticoSteroids (INCS) therapy. Primary Objective: To assess long-term safety (\> 12 months) of budesonide delivered via MAD or INSI as measured objectively via IOP, ACTH stimulation test, and DEXA scan. Research Design: A Prospective Double-Cohort Study Statistical Analysis: Descriptive statistics will be used to analyze the baseline characteristic data and the data from the administered surveys and objective findings of ACTH stimulation test, IOP measurement, and DEXA scans. In addition, rigorous statistical analysis will be conducted on the Likert scale-based SinoNasal Outcome Test (SNOT-22) and EuroQuol health-related quality of life surveys (EQ-5D-5L). These analyses will include cross-tabulations (Pearson's chi square test) and confidence interval calculations. Due to the variations in baseline intraocular pressure measurements, the investigators will calculate an adjusted difference instead of absolute values.

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