Bronchodilator treatment and asthma death: a new analysis of a British case-control study.

TitleBronchodilator treatment and asthma death: a new analysis of a British case-control study.
Publication TypeJournal Article
Year of Publication2011
AuthorsButland BK, Anderson RH, Cates CJ
JournalRespir Med
Volume105
Issue4
Pagination549-57
Date Published2011 Apr
ISSN1532-3064
KeywordsAdolescent, Adrenergic beta-Agonists, Adult, Asthma, Bronchodilator Agents, Case-Control Studies, Child, Child, Preschool, Drug Therapy, Combination, Epidemiologic Methods, Female, Great Britain, Humans, Infant, Male, Middle Aged, Young Adult
Abstract

We investigated the relationship between asthma mortality and long-acting beta(2)-agonists (LABA), including interactions with age, inhaled corticosteroids (ICS) and social deprivation. We used a new, expanded dataset of recorded medication extracted blind from the anonymised primary care records of an earlier British case-control study. The cases were 532 asthma deaths aged < 65 occurring between 1994 and 1998 and the controls were 532 asthma admissions, matched for age, hospital, and index date (date of death/asthma admission). The exposure periods prior to the index date were current (≤ 2 months) or recent ( > 2-6 months). We found no evidence of an overall association with current (OR = 0.89 [95% confidence interval 0.61-1.30]) or recent (1.08 [0.76-1.53]) mention of LABA, but there was some evidence of a positive interaction with age. Among controls with mention of LABA, a concurrent mention of ICS (within 1 month) was common (85% and 93% for the two respective periods) which limited our power to investigate any interaction between LABA and ICS. There was no coherent evidence of effect modification by social deprivation. In a population based case-control study where prescription of LABA without concomitant ICS was uncommon there was no evidence of an overall association between LABA and asthma death.

DOI10.1016/j.rmed.2010.10.008
Alternate JournalRespir Med
PubMed ID21035318