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Canadian Respiratory Journal
Volume 14 (2007), Issue 6, Pages 331-337
Original Article

Comparison of Canadian Versus American Emergency Department Visits for Acute Asthma

Brian H Rowe,1 Gary W Bota,2 Sunday Clark,3 Carlos A Camargo,3 and on behalf of the Multicenter Airway Research Collaboration investigators

1Department of Emergency Medicine and School of Public Health, University of Alberta, Edmonton, Alberta, Canada
2Department of Emergency Medicine, Sudbury Regional Hospital Corporation, Sudbury, Ontario, Canada
3Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA

Copyright © 2007 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


BACKGROUND: Acute asthma is a common emergency department (ED) presentation in both Canada and the United States.

OBJECTIVE: To compare ED asthma management and outcomes between Canada and the United States.

MEHODS: A prospective cohort study of 69 American and eight Canadian EDs was conducted. Patients aged two to 54 years who presented with acute asthma underwent a structured ED interview and telephone follow-up two weeks later.

RESULTS: A total of 3031 patients were enrolled. Canadian patients were more likely to be white (89% versus 22%; P<0.001), have health insurance (100% versus 69%; P<0.001) and identify a primary care provider (89% versus 64%; P<0.001) than American patients. In addition, Canadian patients were more likely to be using inhaled corticosteroids (63% versus 44%; P<0.001) and had higher initial peak expiratory flow (61% versus 48%; P<0.001). In the ED, Canadians received fewer beta-agonist (one versus two; P<0.001) and more anticholinergic (two versus one; P<0.001) treatments in the first hour; use of systemic corticosteroids was similar (60% versus 68%; P=0.13). Canadians were less likely to be hospitalized (11% versus 21%; P=0.02). Corticosteroids were prescribed similarly at discharge (60% versus 69%; P=0.13); however, Canadians were discharged more commonly on inhaled corticosteroids (63% versus 11%; P<0.001) and relapses were similar.

CONCLUSIONS: Canadian patients with acute asthma have fewer barriers to primary care and are more likely to be on preventive medications, both before the ED visit and following discharge. Admissions rates are higher in the United States; however, relapse after discharge is similar between countries. These findings highlight the influences of preventive practices and heath care systems on ED visits for asthma.