Mechanical ventilation is known to induce bacterial translocation from the lung into the systemic circulation. This study determined the effect of immunoglobulin M (IgM)-enriched polyclonal immunoglobulins on bacteremia due to ventilation-induced translocation in an acute respiratory distress syndrome (ARDS) rat model with Klebsiella-induced pneumonia. After whole lung lavage, Sprague-Dawley rats intravenously received either a high dose or a low dose of an immunoglobulin preparation, or an albumin solution as control, followed by an intratracheal injection of a Klebsiella pneumoniae solution. Blood colony-forming units (CFUs) in the treatment groups were significantly lower during the 3-hour ventilation period compared to the control group. The authors conclude that IgM-enriched polyclonal immunoglobulins lead to a reduction of bacteria in blood of surfactant-deficient, ventilated rats infected with Klebsiella pneumoniae.

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Experimental Lung Research
Department of Anesthesiology

Lachmann, R.A, van Kaam, A.H, Haitsma, J.J, Verbrugge, S.J.C, Delreu, F, & Lachmann, B.F. (2004). Immunoglobulin M-enriched intravenous polyclonal immunoglobulins reduce bacteremia following Klebsiella pneumoniae infection in an acute respiratory distress syndrome rat model. Experimental Lung Research, 30(4), 251–260. doi:10.1080/01902140490439013