Abstract
The objective of the study is to investigate the risk factors of vancomycin-induced renal toxicity in older adults, especially in those with chronic kidney disease (CKD) Stages 3-5. In this retrospective observational study, serum vancomycin trough concentrations (VTCs) in patients aged g65 years treated with vancomycin were analyzed, and independent risk factors of vancomycin-induced nephrotoxicity (VIN) were determined by logistic regression analysis. In total, 321 patients were included in this study. Serum VTC was an independent risk factor for vancomycin-induced renal toxicity in total cohort (odds ratio [OR], 1.07; P = 0.004) as well as in the cohort with CKD Stages 3-5 (OR, 1.09; P = 0.010). A daily dose of vancomycin and Charlson comorbidity index was an independent risk factor for vancomycin-induced renal toxicity in total cohort (OR, 3.63; P = 0.006) and in the cohort with CKD Stage 3-5 (OR, 1.83; P = 0.002), respectively. In older adults with CKD Stages 3a and 3b-5, the VTCs associated with higher risk for vancomycin-induced renal toxicity were 21.5 mg/L and 16.5 mg/L, respectively. In older adults, serum VTC is an independent risk factor for VIN. VTCs over 21.5 mg/L and 16.5 mg/L are associated with increased risk of VIN in this population with CKD Stage 3a and 3b-5, respectively.
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