title: A population-based study of emergency department presentations for asthma in regions of Alberta.
abstract: OBJECTIVE
  We describe the epidemiology of asthma presentations to emergency departments (EDs) for 3 main regions in the province of Alberta.
  
  
  METHODS
  We used a comprehensive ED database to identify ED visits in Alberta from April 1999 to March 2005. We linked the visits to other provincial administrative databases to obtain all data on follow-up encounters for asthma during that period. Information extracted included demographics, regions of residence (Edmonton, Calgary or non-major urban [NMU]), timing of ED visits, and subsequent visits to non-ED settings. Data analysis included descriptive summaries and directly standardized visit rates.
  
  
  RESULTS
  During the 6-year study period, 93 146 patients made 199 991 ED visits for asthma. Crude rates in 2004/05 were 7.9/1000, 6.5/1000 and 15.4/1000 in the Edmonton, Calgary and NMU regions, respectively. The Edmonton and Calgary regions had consistently lower visit rates than the NMU regions. The ED visits were followed by low rates of follow-up visits in a variety of non-ED settings, at different intervals.
  
  
  CONCLUSIONS
  Asthma is a relatively common presenting problem in Alberta EDs. This study identified relatively stable rates of presentation during the study period, and variation among regions in terms of age and sex. This study provides further understanding of the variation associated with ED presentation and indicates possible targets for specific interventions to reduce asthma-related ED visits.
authors.affiliation: Department of Pediatrics, Faculty of Medicine & Dentistry, University of Alberta, 11402 University Ave. N.W., Edmonton, Alberta, Canada. rhonda.rosychuk@ualberta.ca
authors.forename: Rhonda J
authors.initials: RJ
authors.lastname: Rosychuk
authors.forename: Donald C
authors.initials: DC
authors.lastname: Voaklander
authors.forename: Terry P
authors.initials: TP
authors.lastname: Klassen
authors.forename: Ambikaipakan
authors.initials: A
authors.lastname: Senthilselvan
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Marrie
authors.forename: Brian H
authors.initials: BH
authors.lastname: Rowe
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000416:Alberta / Q000453:epidemiology; D001249:Asthma / Q000453:epidemiology* / Q000517:prevention & control; D002648:Child; D002675:Child, Preschool; D015986:Confounding Factors, Epidemiologic; D003627:Data Interpretation, Statistical; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D007223:Infant; D007902:Length of Stay / Q000706:statistics & numerical data; D008297:Male; D008875:Middle Aged; D010351:Patient Discharge / Q000706:statistics & numerical data; D015995:Prevalence; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult