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The purpose of this study was to determine if prereatment with taurolidine, a known anti-endotoxin agent, would attenuate the hemodynamic and respiratory responses associated with endotoxin induced lung injury in a large animal model in a randomized controlled study under license from the Department of Health. All animals underwent a general anesthetic. Vascular catheters were placed in the femoral artery and in the femoral vein. A Swan-Ganz Catheter was inserted for measurement of pulmonary artery pressure. Animals were randomized into three groups: Control, with measurements taken at baseline and half hourly up to 90 min; Endotoxin, receiving 5microg/Kg E. coli endotoxin intravenously after baseline measurements; and Endotoxin + Taurolidine, receiving 5g of taurolidine via intraperitoneal infusion 1 h before endotoxin administration. Main outcome measures were mean systemic arterial pressure (MAP), mean pulmonary arterial pressure (MPAP), arterial oxygen tension (pO2), serum endotoxin concentration, and pulmonary myeloperoxidase. Endotoxin induced a significant lung injury characterized by an increase in pulmonary artery pressure, hypoxia, and systemic hypotension. Pretreatment with intraperitoneal taurolidine significantly attenuated these hemodynamic and respiratory changes. Serum endotoxin concentration was also significantly reduced as was lung myeloperoxidase. The data suggest that taurolidine may have a therapeutic role in preventing the lung injury seen in endotoxemia.