Cefotaxime plus metronidazole appears more effective than piperacillin in the prevention of postappendicectomy wound sepsis. Preliminary results of a comparative trial.

Metronidazole suppositories have previously been shown to be superior to povidone iodine intraoperative wound spray in reducing postappendicectomy wound sepsis. In subsequent studies metronidazole suppositories and cefotaxime injections reduced the sepsis rate to 9.3%, while the same combination produced a wound sepsis rate of 7.6% compared with 17.2% for cefotaxime alone. In an ongoing study, metronidazole and cefotaxime are now being compared with piperacillin in a single-blind trial. Adult patients undergoing emergency appendicectomy in Nottingham have been included in this study, which has ethical committee approval. When the decision to perform emergency appendicectomy was made, the patient was randomly allocated a numbered pack. This contained either 3 x 1g injections of cefotaxime and 6 x 1g metronidazole suppositories or 3 x 2g injections of piperacillin and 6 placebos. 40 minutes before operation the patient received the first suppository and the remainder every 8 hours. The patient received the first injection of antibiotic by intravenous or intramuscular injection and the remaining doses 8 and 16 hours later. A wound was regarded as infected if pus discharged either spontaneously or on incision. 175 patients have been studied to date. The treatment groups were well matched for age and sex. Seven of the 77 patients in the cefotaxime/metronidazole group (9.1%) compared with 12 of the 76 in the piperacillin group (15.8%) have developed wound infections. This study confirms that the combination of cefotaxime and metronidazole seems to be more effective than piperacillin alone in the reduction of postappendicectomy wound sepsis. Currently cefotaxime plus metronidazole is the therapy of choice.