Perennial allergic rhinitis and chronic sinusitis: correlation with rhinologic risk factors

Background: The reported association of allergy and sinusitis varies greatl y between study, and the exact role of allergy in predisposing to sinusitis is not clear. We attempted to determine whether patients with perennial al lergic rhinitis are at greater risk of developing sinusitis with respect to a control group, and to determine whether there is a correlation between r hinomanometry, endoscopy, and nasal swab, and computed tomography (CT) find ings. Methods: forty adult patients with perennial allergic rhinitis underwent CT scans of the paranasal sinuses, and the results were then compared to CTs of the paranasal sinuses of 30 control subjects. All allergic patients unde rwent nasal endoscopy, nasal swab, and active anterior rhinomanometry, and the results were studied in relation to the CT findings. Results: We found sinusitis in 67.5% of the allergic patients and in 33.4% of the controls, with a statistically significant difference between the tw o groups (P=0.017). Twenty-three patients had a positive nasal swab; 22 sho wed increased nasal resistance on rhinomanometry, and 36 had positive endos copy, but the association of CT findings with endoscopy, rhinomanometry, or nasal swab was not statistically significant (P=0.583, P=1.00, P=0.506, re spectively). Conclusions: Allergic rhinitis is often associated with sinusitis, but the underlying mechanism has yet to be determined. Evidently, factors other tha n classical pathogen growth and mechanical factors, such as the association of the various factors and immunologic mechanisms, may contribute to the p athogenesis of chronic sinusitis in allergic patients.