Epidemiology of Eosinophilic Esophagitis Over Three Decades in Olmsted County, Minnesota

Abstract

Background & Aims Data on secular trends and outcomes of eosinophilic esophagitis (EE) are scarce. We performed a population-based study to assess the epidemiology and outcomes of EE in Olmsted County, Minnesota, over the last 3 decades. Methods All cases of EE diagnosed between 1976 and 2005 were identified using the Rochester Epidemiology Project resources. Esophageal biopsies with any evidence of esophagitis and/or eosinophilic infiltration were reviewed by a single pathologist. Clinical course (treatment, response and recurrence) was defined using information collected from medical records and prospectively via a telephone questionnaire. Incidence rates per 100,000 person years were directly adjusted for age and sex to the US 2000 population structure. Results A total of 78 patients with EE were identified. The incidence of EE increased significantly over the last 3 of the 5-year intervals (from 0.35 [0,0.87]/100000 person-years during 1991–1995 to 9.45 [7.13, 11.77]/100000 person-years during 2001–2005). The prevalence of EE was 55.0 (42.7, 67.2)/100000 persons as of January 1, 2006 in Olmsted County, Minnesota. EE was diagnosed more frequently in late summer/fall. The clinical course of patients with EE was characterized by recurrent symptoms (observed in 41% of patients). Conclusions The prevalence and incidence of EE is higher than previously reported. The incidence of clinically diagnosed EE increased significantly over the last 3 decades, in parallel with endoscopy volume and seasonal incidence, and was greatest in late summer/fall. EE also appears to be a recurrent relapsing disease in a substantial proportion of patients.