title: Prevalence and clinical significance of eosinophilia in patients with rheumatoid arthritis in Argentina.
abstract: BACKGROUND
  The presence of eosinophilia in peripheral blood has been considered by some authors as an indicator of bad prognosis in patients with rheumatoid arthritis (RA); however, the methodology and the number of patients included in those studies were not appropriate.
  
  
  OBJECTIVE
  To determine the prevalence and possible causes of eosinophilia in patients with RA, and its relationship with a more severe disease.
  
  
  METHODS
  Patients with RA (American College of Rheumatology '87) were included, demographic, clinical, and laboratory data were collected. The presence of eosinophilia was defined as an eosinophil absolute count above 350/mm. Disease activity, health assessment questionnaire, and hand x-rays were performed in all patients. A coproparasitologic test and serology for Toxocara by enzyme-linked immunosorbent assay (ELISA) were determined in patients with eosinophilia.
  
  
  RESULTS
  One hundred nine patients were included, 95 women (87.2%), mean age 50.6 +/- 13 years, mean disease duration 10.8 +/- 7.6 years. Eight patients (7.33%) showed eosinophilia. When demographic and clinical characteristics of patients with or without eosinophilia were compared, the former showed a higher erythrocyte sedimentation rate levels and significantly more frequency of dry mouth, anal pruritus, and paresthesia. The remaining clinical variables, as well as radiologic structural damage were comparable. Parasites in feces (Ascaris lumbricoides and Enterobius vermicularis) were found in 2 patients with eosinophilia. Seven patients with eosinophilia (87.5%) versus 4 (19%) without eosinophilia showed positive serology for Toxocara (P = 0.001).
  
  
  CONCLUSIONS
  The frequency of eosinophilia in our population of patients with RA was 7.33%. It was not an indicator of severity of the disease and in all cases evidence for secondary causes (parasitosis) was found.
authors.affiliation: Section of Rheumatology, Instituto de Rehabilitación Psicofísica, School of Medicine, University of Buenos Aires, Buenos Aires, Argentina.
authors.forename: Flavia
authors.initials: F
authors.lastname: Chiardola
authors.forename: Emilce Edith
authors.initials: EE
authors.lastname: Schneeberger
authors.forename: Gustavo
authors.initials: G
authors.lastname: Citera
authors.forename: Gabriel Marcos
authors.initials: GM
authors.lastname: Rosemffet
authors.forename: Lien
authors.initials: L
authors.lastname: Kuo
authors.forename: Graciela
authors.initials: G
authors.lastname: Santillan
authors.forename: Jose Antonio
authors.initials: JA
authors.lastname: Maldonado-Cocco