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Peritoneal cultures and antibiotic therapy in pediatric perforated appendicitis
D M Mosdell1, D M Morris, D E Fry
1Department of Surgery, University of New Mexico School of Medicine, Albuquerque 87131.
Insights
Surgeons often don't use culture data when choosing antibiotics for perforated appendicitis in children. This study suggests routine peritoneal cavity culturing may not be clinically useful for these pediatric patients.
Area of Science:
- Pediatric Surgery
- Infectious Diseases
- Clinical Microbiology
Background:
- Perforated appendicitis in children is a serious condition requiring prompt surgical and antibiotic treatment.
- Antibiotic selection is crucial for managing intra-abdominal infections, but optimal strategies remain debated.
- Empirical antibiotic therapy is common, but its alignment with actual microbial findings is often unclear.
Purpose of the Study:
- To investigate the relationship between postoperative antibiotic selection and peritoneal culture results in pediatric patients with perforated appendicitis.
- To evaluate the appropriateness of empirical antibiotic regimens based on culture data.
- To determine the clinical utility of routine peritoneal cavity culturing in this patient population.
Main Methods:
- Retrospective review of 70 pediatric cases diagnosed with perforated appendicitis.
- Analysis of initial antibiotic regimens and subsequent changes based on peritoneal culture results.
- Identification of common bacterial isolates from peritoneal cultures.
Main Results:
- The majority of patients (77%) received a three-drug antibiotic combination initially.
- Peritoneal cultures were obtained in 83% of cases, with Escherichia coli and Bacteroides fragilis being the most frequent isolates.
- Antibiotic regimen adjustments were made in only 10% of patients post-culture, with most changes being inappropriate or unnecessary.
- A significant proportion of patients (39 out of 51 with culture data) had antibiotic therapy that did not align with culture findings.
Conclusions:
- Antibiotic selection for perforated appendicitis in children appears to be based on presumed pathogens rather than actual culture data.
- Routine culturing of the peritoneal cavity in pediatric perforated appendicitis may offer limited clinical benefit.
- Current practices suggest a disconnect between empirical antibiotic choices and microbiological evidence, highlighting a need for revised treatment guidelines.
Abstract:
We retrospectively reviewed 70 cases of perforated appendicitis in children to examine the relationship between postoperative antibiotic selection and culture results from the peritoneal cavity. Initial antibiotic therapy chosen for the children consisted of a three-drug combination in 54 (77%) patients. Peritoneal cultures were performed in 58 (83%) patients. Escherichia coli and Bacteriodes fragilis were the most common bacterial isolates from the peritoneal culture. Only 7 (10%) patients had their antibiotic regimen changed after the culture results were available, of which 2 changes brought drug therapy into compliance with the cultures and 5 changes were inappropriate with respect to the peritoneal cultures. Of the remaining 51 patients with culture data available, 39 should have had changes to bring the antibiotic therapy into compliance with the observed culture results. These data indicate that surgeons select antibiotic therapy for perforated appendicitis in children based on assumptions of which organisms should be present in the infection and not on culture data. There appears to be no clinical usefulness to the routine culturing of the peritoneal cavity in children with perforated appendicitis.