Impact of medically recalcitrant chronic rhinosinusitis on incidence of asthma

Background The long-term impact of chronic rhinosinusitis (CRS) with or without allergic rhinitis (AR) on asthma is poorly documented. This study analyzed potential associations of ongoing CRS and AR on asthma. Methods Using the MarketScan™ claims database, patients with CRS and endoscopic sinus surgery (ESS) in 2010 were identified. The date of first sinusitis was determined for all. Patients with asthma at time of first sinusitis diagnosis were excluded. The remaining patients were grouped based on duration of sinusitis, from first diagnosis to surgery—group 1: 1 to