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CHRONIC OBSTRUCTIVE PULMONARY DISEASE |
1 Servei de Pneumologia, Institut Clínic del Tòrax, Hospital Clínic, IDIBAPS Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain
2 Servei de Microbiologia, Hospital Clínic, IDIBAPS Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain
Correspondence to:
Correspondence to:
Dr A Torres
Servei de Pneumologia, Institut Clínic del Tòrax, Hospital Clínic, IDIBAPS Universitat de Barcelona, Villarroel 170, 08036 Barcelona, Spain; atorres{at}ub.edu
Background: Antibiotics are commonly prescribed in exacerbations of chronic obstructive pulmonary disease (COPD). However, the role of bacteria in these exacerbations is controversial.
Objective: To identify clinical predictors of bacterial infection as a cause of exacerbation, considering the protected specimen brush (PSB) as the gold standard.
Methods: Clinical data, sputum and PSB samples were collected from 40 patients with COPD requiring hospitalisation due to severe exacerbations who had not received previous antibiotic treatment.
Results: Quantitative cultures of PSB samples (n = 40) yielded 23 potential pathogenic microorganisms (PPMs) at concentrations of 
102 colony-forming units/ml in 18 (45%) patients. Sputum samples were obtained from all 40 patients. Culture of good-quality sputum samples (n = 18) yielded 16 PPMs corresponding to 14 (35%) patients. The concordance between the PSB and sputum rate was high (
= 0.85, p<0.002). The self-reporting patient observation of sputum purulence (odds ratio (OR) 27.20 (95% confidence interval (CI) 4.60 to 60.69), p = 0.001), the percentage predicted forced expiratory volume in 1 s (FEV1%) <50 (OR 2.27 (95% CI 1.55 to 3.21), p = 0.014), >4 exacerbations in the past year (OR 6.9 (95% CI 0.08 to 1.08), p = 0.028) and previous hospitalisations due to COPD (OR 4.13 (95% CI 1.02 to 16.07), p = 0.041) were associated with the presence of PPMs in the distal airways. The operative characteristics for predicting distal airway infection when patients presented with purulent exacerbation were as follows: sensitivity 89.5%, specificity 76.2%, positive predicted value 77.3% and negative predicted value 88.9%.
Conclusions: The self-reporting presence of purulence in the sputum, as well as common previous exacerbations and hospitalisations due to COPD in patients with severe airflow obstruction (FEV1% <50) predict the presence of bacterial infection in the distal airways. The use of these clinical variables may help in selecting candidates to receive antibiotic treatment.
Abbreviations: CFU, colony-forming units; COPD, chronic obstructive pulmonary disease; FEV1%, percentage predicted forced expiratory volume in 1 s; FVC, forced vital capacity as a percentage of predicted; MIC, minimum inhibitory concentration; PaCO2, arterial CO2 pressure; PaO2, arterial oxygen pressure; PPM, potential pathogenic microorganism; PSB, protected specimen brush
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