Background Although inhaled corticosteroids are effective forthe treatment of asthma, it is uncertain whether their use canprevent death from asthma.
Methods We used the Saskatchewan Health data bases to form apopulation-based cohort of all subjects from 5 through 44 yearsof age who were using antiasthma drugs during the period from1975 through 1991. We followed subjects until the end of 1997,their 55th birthday, death, emigration, or termination of healthinsurance coverage, whichever came first. We conducted a nestedcasecontrol study in which subjects who died of asthmawere matched with controls within the cohort according to thelength of follow-up at the time of death of the case patient(the index date), the date of study entry, and the severityof asthma. We calculated rate ratios after adjustment for thesubject's age and sex; the number of prescriptions of theophylline,nebulized and oral ß-adrenergic agonists, and oralcorticosteroids in the year before the index date; the numberof canisters of inhaled ß-adrenergic agonists usedin the year before the index date; and the number of hospitalizationsfor asthma in the two years before the index date.
Results The cohort consisted of 30,569 subjects. Of the 562deaths, 77 were classified as due to asthma. We matched the66 subjects who died of asthma for whom there were completedata with 2681 controls. Fifty-three percent of the case patientsand 46 percent of the control patients had used inhaled corticosteroidsin the previous year, most commonly low-dose beclomethasone.The mean number of canisters was 1.18 for the patients who diedand 1.57 for the controls. On the basis of a continuous doseresponseanalysis, we calculated that the rate of death from asthma decreasedby 21 percent with each additional canister of inhaled corticosteroidsused in the previous year (adjusted rate ratio, 0.79; 95 percentconfidence interval, 0.65 to 0.97). The rate of death from asthmaduring the first three months after discontinuation of inhaledcorticosteroids was higher than the rate among patients whocontinued to use the drugs.
Conclusions The regular use of low-dose inhaled corticosteroidsis associated with a decreased risk of death from asthma.
Source Information
From the Division of Clinical Epidemiology, Royal Victoria Hospital, McGill University Health Centre, and the Departments of Epidemiology and Biostatistics and of Medicine, McGill University (S.S., P.E., S.B., M.B., B.C.); and the Division of Respiratory Medicine, McGill University Health Centre (P.E.) all in Montreal.
Address reprint requests to Dr. Suissa at the Division of Clinical Epidemiology, Royal Victoria Hospital, 687 Pine Ave. West, Ross 4.29, Montreal, QC H3A 1A1, Canada, or at samy.suissa{at}clinepi.mcgill.ca.
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