610 - Incidence of Acute Kidney Injury in Outpatient Parenteral Antimicrobial Therapy (OPAT) Patients Receiving Vancomycin

Background: Vancomycin therapy is known to be associated with nephrotoxicity. Predictors of nephrotoxicity in outpatients are not well defined and have only been reported in relatively small studies. We examined the factors associated with incidence of nephrotoxicity during outpatient parenteral antimicrobial therapy (OPAT) using administrative data.

Methods: A large insurance claims database of privately insured patients (IBM-MarketScan) ages 18 - 64 from 2010 to 2016 was queried for patients discharged from the hospital on vancomycin OPAT. The primary endpoint was 42-day hospital readmission with acute kidney injury (AKI). A Chi-square test was used to examine associations with AKI. Factors with significant associations in univariate analysis were then incorporated into a multivariable logistic regression model.

Results: A total of 14,196 patients were included in the study, median age was 54 years and 53.8% were male. Hospital readmission with AKI occurred in 385 (2.7 %). Factors associated with AKI in univariate analysis included older age, living in a rural area, heart failure (CHF), chronic kidney disease (CKD), liver disease, diabetes, cancer, septicemia, MRSA infection, concomitant penicillin therapy, receiving therapy at home versus an infusion center, and infectious diseases consult during index hospitalization. In the multivariable model, septicemia, CHF, CKD, liver disease, and concomitant use of a penicillin family drug were independently associated with increased risk of acute kidney injury (Table).

Conclusion: Septicemia, use of penicillins and some comorbidities were associated with AKI in patients treated with vancomycin OPAT. Patients at high risk for vancomycin nephrotoxicity should be monitored closely and an alternative therapy should be considered.Table