title: Methylxanthines for exacerbations of chronic obstructive pulmonary disease: meta-analysis of randomised trials.
abstract: OBJECTIVE
  To evaluate the addition of methylxanthines to standard treatments in patients presenting with acute exacerbations of chronic obstructive pulmonary disease (COPD).
  
  
  METHODS
  Meta-analysis of randomised controlled trials.
  
  
  METHODS
  The Cochrane airways review group's COPD register. Two reviewers independently selected articles for inclusion, assessed methodological quality, and extracted data.
  
  
  METHODS
  Four trials met the inclusion criteria, with 169 patients.
  
  
  METHODS
  Mean change in spirometry, clinical end points, symptom scores, and adverse events.
  
  
  RESULTS
  Mean change in forced expiratory volume at one second at two hours was similar in methylxanthine and placebo groups but transiently increased with methylxanthines at three days. Non-significant reductions in admissions to hospital and length of stay were offset by a non-significant increase in relapses at one week. Changes in symptom scores did not reach significance. Methylxanthines caused more nausea and vomiting than placebo (odds ratio 4.6, 95% confidence interval 1.7 to 12.6), and non-significant increases in tremor, palpitations, and arrhythmias were also observed.
  
  
  CONCLUSIONS
  The available data do not support the use of methylxanthines for the treatment of exacerbations of chronic obstructive pulmonary disease. Potential benefits of methylxanthines for lung function and symptoms were generally not confirmed at standard levels of significance, whereas the potentially important adverse events of nausea and vomiting were significantly increased in patients receiving methylxanthines.
mesh_terms: D000284:Administration, Oral; D000628:Aminophylline / Q000009:adverse effects / Q000627:therapeutic use*; D001993:Bronchodilator Agents / Q000009:adverse effects / Q000627:therapeutic use*; D005541:Forced Expiratory Volume / Q000187:drug effects; D006801:Humans; D007262:Infusions, Intravenous; D029424:Pulmonary Disease, Chronic Obstructive / Q000188:drug therapy* / Q000503:physiopathology; D016032:Randomized Controlled Trials as Topic; D013806:Theophylline / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D001993:Bronchodilator Agents; D000628:Aminophylline; D013806:Theophylline; C029797:doxofylline