Endoscopic polypectomy performed in clinic for chronic rhinosinusitis with nasal polyps: study protocol for the EPIC multicentre randomised controlled trial.

Introduction: Chronic rhinosinusitis (CRS) is common, with a Canadian prevalence of 5%, and associated with significant morbidity. Understandably, CRS impairs workplace productivity but that productivity substantially increases following surgical treatment. CRS with nasal polyps (CRSwNP), the most common type of CRS, is usually treated with a combination of medications and endoscopic sinus surgery (ESS).