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  • Title: Challenging the current treatment paradigm for methicillin-resistant Staphylococcus epidermidis peritonitis in peritoneal dialysis patients.
    Author: Ariano RE, Franczuk C, Fine A, Harding GK, Zelenitsky SA.
    Journal: Perit Dial Int; 2002; 22(3):335-8. PubMed ID: 12227390.
    Abstract:
    OBJECTIVES: To analyze clinical outcomes of Staphylococcus epidermidis peritoneal dialysis peritonitis before and after an interventional switch from a vancomycin/ tobramycin to a cefazolin/tobramycin regimen for empiric treatment. To examine risk factors associated with clinical failure. DESIGN: A retrospective study. SETTING: A peritoneal dialysis program within a university-affiliated tertiary-care hospital. PATIENTS: 93 episodes of S. epidermidis peritonitis over a 6-year period. INTERVENTIONS: Clinical responses were compared between treatments using chi-square or Fisher's exact test. Univariate and multivariate analyses were used to identify significant risk factors for clinical failure. MEASUREMENTS AND MAIN RESULTS: There was no difference in the overall response rates observed with vancomycin (40/49; 81.6%) and cefazolin (23/29; 79.3%) regimens for episodes of S. epidermidis peritonitis. Furthermore, the presence of methicillin resistance in 63 of 93 cases (67.7%) had no influence on clinical outcome, with response rates of 83.9% (26/31) and 82.4% (14/17) for empiric vancomycin and cefazolin regimens, respectively. Tobramycin therapy of less than 2 days was an independent risk factor for clinical failure in multivariate logistic regression analysis (odds ratio 4.44, 95% confidence interval 1.28 - 15.48; p = 0.02). CONCLUSIONS: Empiric treatment with intraperitoneal cefazolin was as effective as vancomycin for S. epiderimidis peritonitis despite a high prevalence of methicillin resistance. Tobramycin therapy of less than 2 days was strongly associated with treatment failure.
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