American journal of respiratory and critical care medicine
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Am. J. Respir. Crit. Care Med. · Feb 2005
Randomized Controlled Trial Clinical TrialEffects of carbon monoxide inhalation during experimental endotoxemia in humans.
Data show that carbon monoxide (CO) exerts direct antiinflammatory effects in vitro and in vivo after LPS challenge in a mouse model. We hypothesized that CO may act as an antiinflammatory agent in human endotoxemia. The aim of this trial was to study the effects of CO inhalation on cytokine production during experimental human endotoxemia. ⋯ LPS infusion transiently increased plasma concentrations of tumor necrosis factor-alpha, interleukin (IL)-6 (approximately 150-fold increases), and IL-8, as well as IL-1alpha and IL-1beta mRNA levels (an approximately 200-fold increase). These LPS-induced changes were not influenced by CO inhalation. Inhalation of 500 ppm CO for 1 hour had no antiinflammatory effects in a systemic inflammation model in humans, as 250 ppm for 1 hour did in rodents.
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Am. J. Respir. Crit. Care Med. · Feb 2005
Randomized Controlled Trial Multicenter Study Clinical TrialHydrocortisone infusion for severe community-acquired pneumonia: a preliminary randomized study.
We hypothesize that hydrocortisone infusion in severe community-acquired pneumonia attenuates systemic inflammation and leads to earlier resolution of pneumonia and a reduction in sepsis-related complications. In a multicenter trial, patients admitted to the Intensive Care Unit (ICU) with severe community-acquired pneumonia received protocol-guided antibiotic treatment and were randomly assigned to hydrocortisone infusion or placebo. Hydrocortisone was given as an intravenous 200-mg bolus followed by infusion at a rate of 10 mg/hour for 7 days. ⋯ At study entry, the hydrocortisone group had lower Pa(O(2)):FI(O(2)), and higher chest radiograph score and C-reactive protein level. By Study Day 8, treated patients had, compared with control subjects, a significant improvement in Pa(O(2)):FI(O(2)) (p = 0.002) and chest radiograph score (p < 0.0001), and a significant reduction in C-reactive protein levels (p = 0.01), MODS score (p = 0.003), and delayed septic shock (p = 0.001). Hydrocortisone treatment was associated with a significant reduction in length of hospital stay (p = 0.03) and mortality (p = 0.009).