TY - JOUR
T1 - Clinical characteristics and airway inflammation profile of COPD persistent sputum producers.
AU - Khurana, S
AU - Ravi, A
AU - Sutula, J
AU - Milone, R
AU - Williamson, R
AU - Plumb, J
AU - Vestbo, J
AU - Singh, D
PY - 2014/12
Y1 - 2014/12
N2 - BACKGROUND: COPD patients with chronic bronchitis include a subgroup with persistent sputum production on most or every day. We hypothesized that COPD patients with persistent sputum production have a different profile of airway inflammation, and more severe clinical characteristics. OBJECTIVE: To compare the airway inflammation profile and clinical characteristics of COPD persistent and non-persistent sputum producers. METHODS: COPD persistent sputum producers (n = 26) and non-persistent sputum producers (n = 26) underwent sputum induction and pulmonary function tests. Exacerbation history was recorded; the St. George's Respiratory Questionnaire, Modified Medical Research Council Dyspnoea scale and COPD Assessment Tool were completed. 33 COPD patients provided sputum for bacteriology. RESULTS: Persistent sputum producers had lower post-bronchodilator FEV1% predicted (p = 0.01), diffusion capacity (p = 0.04), 6 min walk test distance (p = 0.05), and higher closing volume (p = 0.01), BODE index (p = 0.01), rate of bacterial colonization (p = 0.004) and exacerbations (p = 0.03) compared to non-persistent sputum producers. The mean SGRQ and CAT scores were higher in persistent sputum producers (p = 0.01 and 0.03 respectively). Sputum neutrophil and eosinophil total cell counts were higher in persistent sputum producers (p = 0.02 and 0.05 respectively). Sputum levels of eotaxin (p = 0.02), MCP-1 (p = 0.02), TNF-α (p = 0.03) and IL-6 (p = 0.05) were higher in persistent sputum producers. CONCLUSION: COPD persistent sputum producers have more severe clinical characteristics and increased concentrations of some inflammatory mediators in the airways.
AB - BACKGROUND: COPD patients with chronic bronchitis include a subgroup with persistent sputum production on most or every day. We hypothesized that COPD patients with persistent sputum production have a different profile of airway inflammation, and more severe clinical characteristics. OBJECTIVE: To compare the airway inflammation profile and clinical characteristics of COPD persistent and non-persistent sputum producers. METHODS: COPD persistent sputum producers (n = 26) and non-persistent sputum producers (n = 26) underwent sputum induction and pulmonary function tests. Exacerbation history was recorded; the St. George's Respiratory Questionnaire, Modified Medical Research Council Dyspnoea scale and COPD Assessment Tool were completed. 33 COPD patients provided sputum for bacteriology. RESULTS: Persistent sputum producers had lower post-bronchodilator FEV1% predicted (p = 0.01), diffusion capacity (p = 0.04), 6 min walk test distance (p = 0.05), and higher closing volume (p = 0.01), BODE index (p = 0.01), rate of bacterial colonization (p = 0.004) and exacerbations (p = 0.03) compared to non-persistent sputum producers. The mean SGRQ and CAT scores were higher in persistent sputum producers (p = 0.01 and 0.03 respectively). Sputum neutrophil and eosinophil total cell counts were higher in persistent sputum producers (p = 0.02 and 0.05 respectively). Sputum levels of eotaxin (p = 0.02), MCP-1 (p = 0.02), TNF-α (p = 0.03) and IL-6 (p = 0.05) were higher in persistent sputum producers. CONCLUSION: COPD persistent sputum producers have more severe clinical characteristics and increased concentrations of some inflammatory mediators in the airways.
U2 - 10.1016/j.rmed.2014.09.020
DO - 10.1016/j.rmed.2014.09.020
M3 - Article
C2 - 25459449
SN - 1532-3064
VL - 108
JO - Respiratory Medicine
JF - Respiratory Medicine
IS - 12
ER -