The prognosis in unselected communitydwelling patients with heart failure has not been widely studied. Objective: To determine the short-and long-term mortality of patients after first hospitalizations for heart failure and to examine how age, sex, and comorbidities influence survival. Methods: We used the Canadian Institute for Health Information database to construct a retrospective population-based cohort of 38702 consecutive patients with firsttime admissions for heart failure from April

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... 4 through March 1997 in Ontario, Canada. Prognostic variables were collected from hospital discharge abstracts. Vital status at 30 days and 1 year was determined through linkage with the Ontario Registered Persons Database. Regression analyses were used to identify the relationships among survival, age, sex, and comorbidities. Results: The crude 30-day and 1-year case-fatality rates after first admissions for heart failure were 11.6% and 33.1%, respectively. Advancing age, male sex, and the presence of comorbidities as identified by the Charlson Index were independently associated with poorer survival. The 30-day and 1-year mortality ranged from 2.3% and 7.6%, respectively, in the youngest subgroup with minimal comorbidity to 23.8% and 60.7%, respectively, in the oldest comorbidity-laden subgroup. Complex interactions among age and sex, sex and comorbidities, and age and comorbidities were observed in models of shortand long-term survival. Conclusions: The prognosis of unselected community-dwelling patients with heart failure remains poor, despite advances in treatment, with substantial variation seen across different subgroups. Although age, sex, and comorbidities were confirmed to be independent prognostic indicators of heart failure, their complex interaction with survival should be considered in future studies.