Seasonal congestive heart failure mortality and hospitalisation trends, Quebec 1990–1998
- D Ehrmann Feldman1,2,
- R Platt3,
- V Déry1,4,
- C Kapetanakis1,
- D Lamontagne1,
- A Ducharme5,
- N Giannetti6,
- M Frenette7,
- E J Beck1,3
- 1Direction de la Santé Publique de Montréal Centre, Canada
- 2Université de Montréal, GRIS et École de réadaptation, Canada
- 3McGill University, Joint Department of Epidemiology, Biostatistics and Occupational Health, Montreal, Canada
- 4Département de médecine sociale et préventive, Université de Montreal and Institut national de santé publique du Quebec, Canada
- 5Institut de cardiologie de Montreal, Canada
- 6McGill University Health Centre, Royal Victoria Hospital, Montreal, Canada
- 7Hôpital Sacre-Coeur, Montreal, Canada
- Correspondence to: Dr D Ehrmann Feldman Direction de la Santé Publique de Montréal Centre, 1301 Sherbrooke est, Montreal, Quebec H2L 1M3, Canada; debbie.feldmanumontreal.ca
- Accepted 15 October 2003
Abstract
Study objective: To describe seasonal congestive heart failure (CHF) mortality and hospitalisations in Quebec, Canada between 1990–1998 and compare trends in CHF mortality and morbidity with those in France.
Design: Population cohort study.
Setting: Province of Quebec, Canada.
Patients: Mortality data were obtained from the Quebec Death Certificate Registry and hospitalisation from the Quebec Med-Echo hospital discharge database. Cases with primary ICD-9 code 428 were considered cases of CHF.
Results: Monthly CHF mortality was higher in January, declined until September and then rose steadily (p<0.05). Hospital admissions for CHF declined from May until September (moving averages analysis p<0.0001). Seasonal mortality patterns observed in Quebec were similar to those observed in France.
Conclusion: CHF mortality in Quebec is highest during the winter and declines in the summer, similar to observations in France and Scotland. This suggests that absolute temperatures may not necessarily be that important but increased CHF mortality is observed once environmental temperatures fall below a certain “threshold” temperature. Alternatively better internal heating and warmer clothing required for survival in Quebec may ameliorate mortality patterns despite colder external environments.
