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Infectious etiology of acute exacerbations in severe COPD patients
Arnau Domenech1, Carmen Puig, Sara Martí
1Department of Microbiology, Hospital Universitari de Bellvitge, IDIBELL, University of Barcelona, Barcelona, Spain; CIBERES (Ciber de Enfermedades Respiratorias), ISCIII, Madrid, Spain.
Insights
The bacterial causes of acute exacerbations in severe COPD differ based on annual episode frequency. Pseudomonas aeruginosa is the most common pathogen overall, but specific bacteria are linked to single versus multiple exacerbations.
Area of Science:
- Pulmonology
- Infectious Diseases
- Microbiology
Background:
- Acute exacerbations of chronic obstructive pulmonary disease (AECOPD) significantly impact patient outcomes.
- Understanding the etiology of AECOPD is crucial for effective management, especially in severe cases.
- Limited data exist on the specific pathogens causing AECOPD in patients with varying annual exacerbation frequencies since the updated GOLD guidelines.
Purpose of the Study:
- To investigate the etiological differences in AECOPD among severe COPD patients based on their annual frequency of exacerbations.
- To identify the predominant bacterial pathogens associated with single versus multiple AECOPD episodes.
Main Methods:
- Prospective follow-up of 111 severe COPD patients (FEV1 < 50%) over one year.
- Collection and processing of sputum samples during AECOPD episodes.
- Utilized quantitative culture and PCR for bacterial identification, including atypical bacteria.
Main Results:
- 188 sputum samples were analyzed from 111 patients, categorized into single (40 patients) and recurrent (≥2 episodes, 71 patients) exacerbators.
- Pseudomonas aeruginosa was the most frequently isolated pathogen (54/188 episodes).
- Haemophilus influenzae was more common in patients with single AECOPD (33% vs. 16%), while Enterobacteriaceae were associated with frequent exacerbators (0% vs. 12%).
Conclusions:
- Pseudomonas aeruginosa is the leading cause of AECOPD in severe COPD patients.
- The bacterial etiology of AECOPD varies significantly depending on whether patients experience single or multiple exacerbations annually.
- These findings highlight the need for tailored diagnostic and therapeutic approaches based on exacerbation frequency.
Objectives:
Since the new GOLD guidelines were implemented no data have been published about the etiology of acute exacerbations (AECOPD) in severe COPD patients with a different frequency of annual episodes.
Methods:
One hundred and eleven COPD patients (FEV1 < 50%) were prospectively followed up for a year. Good-quality sputum samples recovered during AECOPD were processed, including quantitative culture and PCR detection of atypical bacteria.
Results:
A total of 188 sputum samples were obtained from AECOPD episodes. Forty patients had a single episode, and 71 patients had ≥2. In 128 episodes a single pathogen was isolated, while 42 episodes were polymicrobial (≥2 pathogens). Overall, the most frequent pathogen isolated was Pseudomonas aeruginosa (n = 54), followed by Haemophilus influenzae (n = 37), Streptococcus pneumoniae (n = 31), Moraxella catarrhalis (n = 29) and Staphylococcus aureus (n = 12). P. aeruginosa was the most frequent in both groups of patients (35% and 27% in those with 1 and ≥2 AECOPD, respectively). H. influenzae was associated with patients with a single annual AECOPD (33% vs. 16%; P = 0.006), while Enterobacteriaceae were associated with frequent exacerbators (0% vs. 12%; P < 0.044).
Conclusion:
Overall, P. aeruginosa was the most frequent pathogen isolated from exacerbations. However, different bacterial etiology was observed depending on the number of annual episodes.
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