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Pathogenesis of early operative site infections after orthotopic liver transplantation.

BACKGROUND
We hypothesized that operative site infections after orthotopic liver transplantation arise from bacteria in bile or jejunum.


METHODS
To ascertain the validity of this hypothesis and to assess the effect of systemic antibiotic prophylaxis, we obtained intraoperative cultures of peritoneum, fascia, explant and donor liver bile, and jejunal lumen in 77 liver transplantations, and we monitored outcome.


RESULTS
Pathogens were recovered from peritoneum, fascia, or bile in 11 cases. By univariate analysis, a positive culture was significantly associated with choledochojejunostomy (P=0.0002), previous liver transplantation (P=0.0002), and previous hepatobiliary surgery (P=0.002). Operative site infections during the first 2 weeks after transplantation occurred only in cases with positive intraoperative cultures, and three of the four infections were caused by the same bacteria detected intraoperatively. Antibiotic susceptibility of intraoperative isolates was tested in nine cases; infection occurred in two of three cases in which the isolates were resistant to the systemic antibiotic prophylaxis and in none of six cases with susceptible isolates.


CONCLUSIONS
Our findings suggest that systemic antibiotic prophylaxis for more than 2 days may be beneficial in cases with bacterial contamination of the operative site but may not be necessary in other cases.