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Cardiovascular Events Associated With Ipratropium Bromide in COPD

      Background

      Studies have suggested an increased risk of cardiovascular morbidity and mortality associated with the use of ipratropium bromide. We sought to examine the association between ipratropium bromide use and the risk of cardiovascular events (CVEs).

      Methods

      We performed a cohort study of 82,717 US veterans with a new diagnosis of COPD between 1999 and 2002. Subjects were followed until they had their first hospitalization for a CVE (acute coronary syndrome, heart failure, or cardiac dysrhythmia), they died, or the end of the study period (September 30, 2004). Cumulative anticholinergic exposure was calculated as the number of 30-day equivalents (ipratropium bromide) within the past year. We used Cox regression models with time-dependent covariates to estimate the risk of CVE associated with anticholinergic exposure and to adjust for potential confounders, including markers of COPD severity and cardiovascular risk.

      Results

      We identified 6,234 CVEs (44% heart failure, 28% acute coronary syndrome, 28% dysrhythmia). Compared with subjects not exposed to anticholinergics within the past year, any exposure to anticholinergics within the past 6 months was associated with an increased risk of CVE (hazard ratio [95% CI] for≤four and>four 30-day equivalents: 1.40 [1.30–1.51] and 1.23 [1.13–1.36], respectively). Among subjects who received anticholinergics more than 6 months prior, there did not appear to be elevated risk of a CVE.

      Conclusions

      We found an increased risk of CVEs associated with the use of ipratropium bromide within the past 6 months. These findings are consistent with previous concerns raised about the cardiovascular safety of ipratropium bromide.
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      Linked Article

      • Anticholinergic Drugs for the Treatment of COPD Are Safe… Are They?
        CHESTVol. 137Issue 1
        • Preview
          COPD is increasingly recognized as a complex systemic disorder with a whole range of comorbidities, especially cardiovascular, contributing significantly to COPD morbidity and mortality.1 Among the most frequently prescribed inhaled medications for this disorder are anticholinergic agents, such as short-acting ipratropium bromide, available for 20 years, and the long-acting drug tiotropium bromide, introduced in 2002, which has been shown to improve airflow, hyperinflation, exercise tolerance, exacerbations of COPD, and health-related quality of life with once-daily dosing2–8 in patients with COPD.
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