Re-evaluation of a randomized controlled trial of antibiotics for minor respiratory illness in general practice
1Division of Primary Health Care, University of Bristol, Canynge Hall, Whiteladies Road, Bristol BS8 2PR, UK.
Background:
A systematic review examining the efficacy of antibiotics in acute respiratory illness concluded that antibiotics are of little benefit. However, that review was based on analysis of only six randomized controlled trials, one of which was excluded because its analysis included patients with multiple episodes of illness; treatment group, either antibiotic or placebo, might have confounded the likelihood of suffering a subsequent episode of illness.
Methods:
This previously excluded randomized controlled trial of 301 patients with symptoms of minor respiratory illness was re-analysed to examine the efficacy of antibiotic versus placebo in terms of resolution of symptoms, most particularly cough.
Results:
Antibiotic had no impact on the resolution of symptoms of cough at 1 and 2 weeks, respectively; adjusted odds ratio 1.2 [95% confidence interval (CI) 0.7--2.1] and 0.8 (95% CI 0.4--1.6). In those 220 (73%) individuals who suffered a cough, 48 (44%) and 19 (17%) of patients taking placebo were still coughing after 1 and 2 weeks, respectively.
Conclusion:
It appears that an antibiotic is likely to have, at best, a marginal impact on resolution of symptoms for most patients with minor respiratory illness in the community.
Insights
This study found antibiotics offer little benefit for minor respiratory illness symptom resolution, particularly cough. Re-analysis of a trial confirms antibiotics do not significantly improve cough recovery time in community patients.
Area of Science:
- General Medicine
- Pharmacology
- Infectious Diseases
Background:
- Previous systematic reviews suggest limited antibiotic efficacy for acute respiratory illness.
- A prior randomized controlled trial was excluded due to analysis of multiple illness episodes.
- This exclusion potentially confounded antibiotic vs. placebo treatment effects.
Purpose of the Study:
- To re-analyze a previously excluded randomized controlled trial.
- To investigate antibiotic efficacy versus placebo for minor respiratory illness symptoms, focusing on cough resolution.
Main Methods:
- Re-analysis of a randomized controlled trial involving 301 patients.
- Comparison of antibiotic versus placebo treatment groups.
- Assessment of symptom resolution, specifically cough, at 1 and 2 weeks post-treatment.
Main Results:
- Antibiotics showed no significant impact on cough resolution at 1 or 2 weeks.
- Adjusted odds ratios for cough resolution were 1.2 (95% CI 0.7–2.1) and 0.8 (95% CI 0.4–1.6) respectively.
- In patients with cough, placebo recipients still experienced coughing at 1 week (44%) and 2 weeks (17%).
Conclusions:
- Antibiotics likely have a minimal impact on symptom resolution for most community-based minor respiratory illnesses.
- The findings support conservative antibiotic use in primary care for self-limiting respiratory conditions.
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