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1 From the Department of Medicine, Division of Pulmonary and Critical Care Medicine, The University of Tennessee Medical Center, Regional Medical Center, and Veteran Affairs Medical Center, Memphis
2 From the Department of Preventive Medicine, Division of Biostatistics and Epidemiology, The University of Tennessee Medical Center, Regional Medical Center, and Veteran Affairs Medical Center, Memphis
3 From the Department of Medicine, Division of Connective Tissue Diseases, The University of Tennessee Medical Center, Regional Medical Center, and Veteran Affairs Medical Center, Memphis
Background: Inflammatory cytokines (ICs) are important modulators of injury and repair. ICs have been found to be elevated in the BAL of patients with both early and late ARDS. We tested the hypothesis that recurrent injury to the alveolocapillary barrier and amplification of intra-alveolar fibroproliferation observed in nonresolving ARDS is related to a persistent inflammatory response. For this purpose, we obtained serial measurements of BAL IC and correlated these levels with lung injury score (LIS), BAL indexes of endothelial permeability (albumin, total protein [TP]), and outcome.
Methods: We prospectively studied 27 consecutive patients with severe medical ARDS. Using enzyme-linked immunosorbent assay methods, levels of tumor necrosis factor-
(TNF-) and interleukins (IL) 1β, 2, 4, 6, and 8 were measured at frequent intervals in both plasma and BAL. In 22 patients, bilateral BAL was obtained on day 1 of ARDS and at weekly intervals when possible. Right and left BALs were analyzed separately for IC levels, total cell count and differential, albumin, TP, and quantitative bacterial cultures.
Results: On day 1 of ARDS, the 10 nonsurvivors had significantly higher (p=0.0002) BAL TNF-, IL-1β, IL-6, and IL-8 levels, which remained persistently elevated over time, indicating a continuous injury process. In contrast, the 12 survivors had a lesser elevation and a rapid reduction over time. Initial BAL IL-2 and IL-4 levels were significantly higher in patients with sepsis (p=0.006); both increased over time in survivors and nonsurvivors. BAL levels of TNF-, IL-1β, IL-6, and IL-8 correlated with BAL albumin and TP concentrations but not with LIS or ratio of arterial oxygen tension to inspired oxygen concentration. BAL:plasma ratios were elevated for all measured cytokines, suggesting a pulmonary origin. On day 1 of ARDS, nonsurvivors had significantly higher (p=0.04) BAL:plasma ratios for TNF-, IL-1β, IL-6, and IL-8. Over time, BAL: plasma ratios for TNF-, IL-1β and IL-6 remained elevated in nonsurvivors and decreased in survivors.
Conclusions: Our findings indicate that an unfavorable outcome in ARDS is associated with an initial, exaggerated, pulmonary inflammatory response that persists unabated over time. Plasma IC levels parallel changes in BAL IC levels. The BAL:plasma ratio results suggest, but do not prove, a pulmonary origin for IC production. BAL TNF-, IL-1β, and IL-8 levels correlated with BAL indices of endothelial permeability. In survivors, reduction in BAL IC levels over time was associated with a decline in BAL albumin and TP levels, suggesting effective repair of the endothelial surface. These findings support a causal relationship between degree and duration of lung inflammation and progression of fibroproliferation in ARDS.
Key Words: ARDS • BAL • fibroproliferation • interleukins • outcome • tumor necrosis factor
Submitted on March 17, 1995
Accepted on June 1, 2007
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