Safety and Efficacy of Mezlocillin: A Single-drug Therapy for Penetrating Abdominal Trauma

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Abstract
This study was done to determine if a single drug, mezlocillin (Mezlo), is as safe and as effective as combined clindamycin (Clind) and gentamicin (Gent) in the treatment of penetrating abdominal wounds. One hundred seventy-three patients received either Mezlo or Clind/Gent combined therapy as assigned by computer-generated randomization. Of these, 147 patients were evaluable. Of 73 patients treated with Clind/Gent the mean duration of hospital stay was 8.9 .+-. 4.0 days. Infectious complications developed in 18 patients of whom five failed to respond promptly, but only one required change in therapy. Of 74 patients treated with Mezlo, the mean duration of hospital stay was 9.1 .+-. 5.0 days. Infectious complications occurred in 17, in whom four patients failed to eliminate their infections, and two needed changes in antibiotic therapy. None of the patients in either antibiotic group failed because of Enterococcus or Pseudomonas infections. There were no deaths. Twelve isolates of Bacteroides were found in peritoneal fluid cultures and all these patients had colon injuries. The overall therapeutic response was excellent to good in 94% on Clind/Gent and 93% on Mezlo. Azotemia developed in one patient on Clind/Gent and one on Mezlo but no other adverse reactions occurred. The differences shown between the two groups were not statistically significant. We conclude that a single drug mezlocillin is as safe and as effective in the treatment of abdominal trauma as combined clindamycin and gentamicin.