Systemic Cytokines, Clinical and Physiological Changes in Patients Hospitalized for Exacerbation of COPD

Abstract Background: Systemic inflammation in patients with COPD may worsen during exacerbations, but there is limited information relating levels of systemic inflammatory markers with symptoms and physiologic changes during an exacerbation Methods: We measured dyspnea using the visual analog scale, pulmonary function tests, hemograms, and plasma levels for interleukin (IL)-6, IL-8, leukotriene B 4 (LTB4), tumor necrosis factor-A, and secretory leukocyte protease inhibitor (SLPI) in 20 patients on admission to a hospital for exacerbation of COPD (ECOPD), 48 h later (interim), and 8 weeks after hospital discharge (recovery). Results: Dyspnea was present in all patients. Inspiratory capacity improved faster than FEV 1 . Compared to recovery, there was a significant increase in the mean (± SD) hospital admission plasma levels of IL-6 (6.38 ± 0.72 to 2.80 ± 0.79 pg/mL; p = 0.0001), IL-8 (8.18 ± 0.85 to 3.72 ± 0.85 pg/mL; p = 0.002), and LTB4 (8,675 ± 1,652 to 2,534 ± 1,813 pg/mL; p = 0.003), and the percentages of segmented neutrophils (79 to 69%; p r = 0.61; p = 0.01) and IL-8 ( r = 0.56; p = 0.04) with changes in dyspnea and levels of IL-6 ( r = −0.51; p = 0.04) and TNF-A ( r = −0.71; p 1. Conclusions: Hospitalized patients with ECOPDs experience significant changes in systemic cytokine levels that correlate with symptoms and lung function. An ECOPD represents not only a worsening of airflow obstruction but also increased systemic demand in a host with limited ventilatory reserve.