Prevention of cardiovascular effects of endotoxaemia by monoclonal antibodies specific for core endotoxin

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Abstract
Passive immunization with antibody to the core region of endotoxin (core lipopolysaccharide (LPS)) has been reported to reduce mortality in severe sepsis. A rat model of endotoxaemia that reproduces the hyperdynamic cardiovascular state seen in early sepsis was developed to test monoclonal antibodies specific for core LPS. A thermodilution technique of measuring cardiac output was adapted for use in rats. Twenty‐five animals were anaesthetized and mechanically ventilated with monitoring of central venous pressure and mean arterial pressure. Fluid replacement was adjusted to maintain the central venous pressure. Controls (n = 10) and antibody‐treated animals (n = 5) showed no significant change in cardiac output. Animals given 0.1 mg kg−1 R2 endotoxin over 1 h (n = 5) showed a significant rise in cardiac output of 65 per cent (P < 0.01). This was abolished in rats given both antibody and endotoxin (n = 5). This study provides evidence that a monoclonal antibody against core LPS abolishes the hyperdynamic state induced by endotoxin infusion.