Hepatic oxygen consumption and cytochrome P450 activity in experimental faecal peritonitis.

OBJECTIVE: To study hepatic oxygen consumption and cytochrome P450 activity in pigs with septic shock induced by faecal peritonitis.DESIGN: Controlled experimental study.ANIMALS: 12 pigs weighing 19-27 kg.INTERVENTION: The animals were divided into a control group (n = 6) and a peritonitis group (n = 6). Peritonitis was induced by intraperitoneal instillation of a standard amount of autologous faeces. The animals were then observed for 300 minutes. Liver biopsy specimens were taken at 0 and 300 minutes.MAIN OUTCOME MEASURES: Hepatic oxygen delivery (DO2) and consumption (VO2). Cytochrome P450 activity was studied by measuring O- and N-demethylation of codeine at 0 and 300 minutes.RESULTS: Hepatic DO2 was reduced, whereas VO2 was increased during sepsis. There were no significant changes in the N- and O-demethylation of codeine.CONCLUSIONS: Hepatic VO2 did increase during sepsis, possibly because of the increased metabolic demand. Cytochrome P450 activity was unaffected by the septic challenge.

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