Risk of stroke associated with inhaled ipratropium bromide in chronic obstructive pulmonary disease: A population-based nested case-control study

International Journal of Cardiology, 06/12/2012

Use of ipratropium is associated with an increased risk of stroke in chronic obstructive pulmonary disease (COPD) patients. Clinicians should be alert to that risk when prescribing ipratropium, especially for those receiving ipratropium more recently or those with concomitant use of SABAs or theophyllines.

Methods

  • This was a population–based nested case–control study analyzing data from the National Health Insurance Research Database in Taiwan.
  • A cohort of 15,396 newly–diagnosed chronic obstructive pulmonary disease (COPD) patients was included between 2001 and 2007, in which 1477 cases of incident hospitalization for stroke were identified.
  • A cohort of 15,396 newly–diagnosed chronic obstructive pulmonary disease (COPD) patients was included between 2001 and 2007, in which 1477 cases of incident hospitalization for stroke were identified.
  • Each case was individually matched to four randomly–selected controls based on age, sex, and cohort entry date.
  • Conditional logistic regressions were used to estimate the odds ratio (OR) for risk of stroke–related hospitalization associated with ipratropium use.

Results

  • Any use of ipratropium within the 6months before the index date was associated with an increased risk of stroke compared with nonuse (adjusted OR, 2.02; 95% CI, 1.71 to 2.41).
  • The observed risk remained significant regardless of accumulated doses.
  • Additionally, use of ipratropium within 30days before the index date resulted in the greatest risk (adjusted OR, 2.97 95% CI, 2.27 to 3.88).
  • Furthermore, an increased risk of stroke was found for ipratropium regimens involving concomitant use of inhaled short–acting β2–agonists (SABAs; adjusted OR, 2.18; 95% CI, 1.81 to 2.62) or theophyllines (adjusted OR, 1.79; 95% CI, 1.42 to 2.26).

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