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RISK FACTORS AND OUTCOMES OF EXTENDED-SPECTRUM BETA-LACTAMASEPRODUCING E. COLI PERITONITIS IN CAPD PATIENTS

Department of Medicine, Tung Wah Hospital, The University of Hong Kong, Hong Kong

Correspondence to: T. Yip, Department of Medicine, Tung Wah Hospital, The University of Hong Kong, Hong Kong.
terenceyip{at}netvigator.com

• Objective: To determine the risk factors and outcomes of peritonitis caused by extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli in continuous ambulatory peritoneal dialysis (CAPD).
  
• Patients and Methods: Episodes of E. coli CAPD peritonitis in our unit from October 1994 to August 2003 were reviewed. Demographic data, underlying medical conditions, recent use of gastric acid inhibitors (including H₂ antagonist and proton pump inhibitor), recent antibiotic therapy, antibiotic regimen for peritonitis episodes, sensitivity test results of the E. coli isolated, and clinical outcomes were examined.
  
• Results: Over a 10-year study period, 88 episodes of E. coli peritonitis were recorded; 11 of the 88 cases were caused by ESBL-producing E. coli. Recent use of cephalosporins and gastric acid inhibitor were associated with the development of ESBL-producing E. coli peritonitis. Compared with non-ESBL-producing E. coli peritonitis, more cases in the ESBL-producing E. coli group developed treatment failure (45.5% vs 13.0%, p = 0.02) and died of sepsis (27.3% vs 3.9%, p = 0.02). Peritoneal failure rate was higher in the ESBL-producing E. coli group, although the difference was not statistically significant (18.2% vs 3.9%, p = 0.12).
  
• Conclusion: Peritonitis caused by ESBL-producing E. coli is associated with worse clinical outcomes. The use of cephalosporins and gastric acid inhibitors may contribute to its development. Further studies are warranted to investigate and determine the predisposing factors for ESBL-producing E. coli peritonitis.
  

KEY WORDS: Extended-spectrum beta-lactamase; E. coli; peritonitis; cephalosporin; gastric acid inhibitor.

Received 18 December 2004; accepted 19 August 2005.

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