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OBJECTIVES: To determine if the incidence of nephrotoxicity is higher in pediatric patients treated with the combination of vancomycin and piperacillin-tazobactam, compared to patients treated with vancomycin alone. Secondary objectives were to determine if admission to an intensive care unit (ICU), higher serum vancomycin trough concentrations (&gt;15 mg/L), or receipt of other nephrotoxic agents were related to the development of nephrotoxicity. METHODS: This was a retrospective, single-center, cohort study of 79 patients treated with vancomycin and 106 patients treated with vancomycin and pipracillin/tazobacatam (TZP). Serum creatinine was trended to determine if patients had nephrotoxicity, which was defined as at least a 100% increase in serum creatinine or an increase of ≥0.5 mg/dL from the baseline value. Fisher's exact test was used to compare the incidence of nephrotoxicity in the vancomycin group to the combination group. Secondary objectives were evaluated by using relative risk (RR). RESULTS: Nephrotoxicity developed in 3 of 79 patients (3.8%) in the vancomycin group and in 25 of 106 patients (23.6%) on combination therapy (p = 0.0001). In patients receiving only vancomycin, there was no statistically significant increase in nephrotoxicity for patients in the ICU (RR 1.85, 95% confidence interval [CI] 0.175-19.62, p = 0.61), those with higher vancomycin troughs (RR 2.32, CI 0.226-23.86, p = 0.48), or those receiving other nephrotoxic medications (RR 2.94, CI 0.2779-31.05, p = 0.37). In the combination group, having higher serum vancomycin trough concentrations increased the risk of nephrotoxicity (RR 5.22, CI 2.407-11.306, p &lt; 0.0001). CONCLUSIONS: Combination therapy with vancomycin and TZP is potentially more nephrotoxic than vancomycin alone. ICU admissions, high vancomycin troughs (&gt;15 mg/L), and concomitant nephrotoxic medications cannot be excluded as risk factors for the observed increase in nephrotoxicity in patients receiving vancomycin and TZP.

the journal of pediatric pharmacology and therapeutics

Does Combination Therapy With Vancomycin and Piperacillin-Tazobactam Increase the Risk of Nephrotoxicity Versus Vancomycin Alone in Pediatric Patients?