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  • Title: Comparison of Rates of Nephrotoxicity Associated with Vancomycin in Combination with Piperacillin-Tazobactam Administered as an Extended versus Standard Infusion.
    Author: Mousavi M, Zapolskaya T, Scipione MR, Louie E, Papadopoulos J, Dubrovskaya Y.
    Journal: Pharmacotherapy; 2017 Mar; 37(3):379-385. PubMed ID: 28079263.
    Abstract:
    STUDY OBJECTIVE: Despite recent reports of relatively high rates (16-37%) of acute kidney injury (AKI) in patients receiving the combination of intravenous piperacillin-tazobactam (PTZ) and vancomycin, data are limited evaluating the impact of PTZ infusion strategy on the occurrence of nephrotoxicity. The objective of this study was to compare the rates of nephrotoxicity in patients receiving vancomycin in combination with PTZ administered as an extended infusion (EI) versus a standard infusion (SI). DESIGN: Single-center, retrospective, matched-cohort study. SETTING: Large academic tertiary care hospital. PATIENTS: Two hundred eighty adults with a creatinine clearance (CrCl) of 40 ml/minute or higher who received at least 96 hours of vancomycin plus PTZ EI (140 patients) or vancomycin plus PTZ SI (140 patients) between January 1, 2009, and December 31, 2011, and between January 1, 2013, and December 31, 2014 (year 2012 was skipped due the closure of inpatient units following Superstorm Sandy); 48 patients in each group were admitted to the intensive care unit. MEASUREMENTS AND MAIN RESULTS: The median age of all patients was 67 (interquartile range [IQR] 54-77) years, and CrCl was 75 (IQR 55-107) ml/minute. Nephrotoxicity was assessed by the risk, injury, failure, loss, and end-stage kidney disease (RIFLE) and Acute Kidney Injury Network (AKIN) criteria. Rates of AKI, according to these criteria, were similar between groups: 17.9% versus 17.1% (p=1) and 32.9% versus 29.3% (p=0.596) for the PTZ EI and PTZ SI groups, respectively. When controlling for residual differences between groups in a conditional logistic regression analysis, no association was observed between receipt of PTZ EI and RIFLE-defined AKI (odds ratio 0.522, 95% confidence interval 0.043-6.295, p=0.609). Time to onset of nephrotoxicity was 4 (IQR 3-6) days, with no significant difference noted between groups (p=0.887). CONCLUSION: Our findings suggest a similar rate of nephrotoxicity between patients who received vancomycin in combination with PTZ EI versus PTZ SI. These results need to be further validated in a prospective randomized controlled study.
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