1925. Vancomycin Treatment and Time to Adverse Drug Reactions During Outpatient Parenteral Antimicrobial Therapy (OPAT)

Abstract Background Over 250,000 patients receive outpatient parenteral antimicrobial therapy (OPAT) in the United States each year. Vancomycin is commonly used in OPAT but has a high rate of discontinuations due to adverse drug reactions (ADRs). Being able to predict the occurrence of these ADRs and assess their impact could improve the overall quality of OPAT services when utilizing vancomycin. Methods This was a retrospective chart review of all adult University of Utah Health (UUH) patients who received vancomycin OPAT and had planned follow-up with UUH infectious disease (ID) providers between October 25, 2018 and July 31, 2019. Patients were excluded if they were less than 18 years of age, pregnant, did not have planned follow up with UUH ID physicians, or were on any form of renal replacement therapy. The primary outcome assessed was discontinuation of vancomycin due to ADR, as documented by the ID provider. Type of ADR leading to discontinuation and 30-day unplanned readmission were also assessed. Results One hundred fifty-eight patients met inclusion criteria (n=158). The mean age of patients was 55 years with a median Charlson comorbidity score of 3. Most patients utilized a non-UUH infusion service (116, 73% vs 42, 27%) and utilized vancomycin as their sole antibiotic (83, 53%). The majority of patients were being treated for orthopedic infections (78, 49%). Twenty-eight patients discontinued vancomycin OPAT due to an ADR (18%). The most common ADR leading to discontinuation was acute kidney injury (10, 36%). Variables associated with ADRs leading to discontinuation included utilization of UUH home infusion services (54% vs 21%, P < 0.001) and initial vancomycin plasma concentrations obtained less than 7 days after discharge (92% vs 71%, P < 0.001). The overall 30 day readmission rate was 10% and the rate among patients who experienced an ADR leading to discontinuation was higher than those who did not (25% vs 8%, P < 0.001). Conclusion The overall rate of discontinuation of vancomycin OPAT due to ADR in the UUH population is similar to what has been described in previous literature. The higher rate of unplanned readmission in the population of patients who experienced ADRs warrants further study. The results of this study will be utilized for future quality improvement interventions at our institution. Disclosures Russell J. Benefield, PharmD, Merck and Co (Grant/Research Support)Paratek Pharmaceuticals (Grant/Research Support)Rempex Pharmaceuticals (Grant/Research Support)

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743. Evaluation of Adverse Drug Reactions due to Common β-Lactam Therapies Among Patients Enrolled in an Outpatient Parenteral Antimicrobial Therapy (OPAT) Program

Open Forum Infectious Diseases ◽

10.1093/ofid/ofz360.811 ◽

2019 ◽

Vol 6 (Supplement_2) ◽

pp. S332-S332

Author(s):

Erin Mays ◽

Alan C Kinlaw ◽

Michael J Swartwood ◽

Renae A Boerneke ◽

Claire E Farel ◽

...

Keyword(s):

Adverse Drug Reactions ◽

Antimicrobial Therapy ◽

Medical Center ◽

Drug Reactions ◽

Outpatient Parenteral Antimicrobial Therapy ◽

Diabetic Foot Infections ◽

Kaplan Meier ◽

Average Patient ◽

Estimated Risk ◽

Treatment Changes

Abstract Background The UNC Medical Center Outpatient Parenteral Antimicrobial Therapy (OPAT) program was started in 2015 to provide multidisciplinary monitoring and management of patients discharged on parenteral antimicrobials. Laboratory abnormalities and adverse drug reactions (ADRs) are potential complications of OPAT that may result in readmission and treatment changes. The purpose of this study was to evaluate the time to first ADR for OPAT patients treated with BL therapies for diabetic foot infections (DFI) and osteomyelitis (OM). Methods This was a retrospective cohort study of patients enrolled in the UNC OPAT program between January 2015 and September 2018 for treatment of DFI or OM. Included patients received one of the following BL: cefepime, ceftriaxone, ertapenem, meropenem, and piperacillin/tazobactam. The primary outcome was time to first ADR during OPAT. Secondary outcomes were estimation of risk of ADR during OPAT for each medication; and ADR types and frequencies observed among patients treated with BL alone or with concomitant vancomycin or daptomycin. Results In this cohort, 178 OPAT patients received 193 OPAT courses, for a median duration of 42 days (IQR 38–50). The average patient age was 55 years, and 68% were male. Ertapenem was the most commonly prescribed BL (76 courses, 39%), followed by ceftriaxone (29, 15%), cefepime, (41, 21%), piperacillin/tazobactam (30, 16%) and meropenem (17, 9%). Approximately 40% (76) patients received concomitant vancomycin. ADR was documented in 48 patients (27%) and 56 courses of therapy (29%). Kaplan–Meier-estimated risk of at least one ADR in the first 8 weeks of therapy was 38.7% (95% CI 29.1% to 48.2%). ADR resulted in 32 therapy changes and 8 readmissions. Conclusion More than one-third of patients treated with BL for treatment of DFI and/or OM are at risk of ADR within 8 weeks. ADR commonly resulted in treatment changes, and possible hospital readmission. BL therapy is associated with significant ADR risk, and careful selection and monitoring is essential for optimal patient safety during OPAT. Disclosures All authors: No reported disclosures.

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Adverse Drug Reactions Among Patients Enrolled in an Outpatient Parenteral Antimicrobial Therapy (OPAT) Program 2015–2016 at UNC Medical Center

Open Forum Infectious Diseases ◽

10.1093/ofid/ofx163.813 ◽

2017 ◽

Vol 4 (suppl_1) ◽

pp. S341-S341

Author(s):

Vahini Chundi ◽

Anh Eichholz ◽

Onyeka Nwankwo ◽

Alan Kinlaw ◽

Wesley Kufel ◽

...

Keyword(s):

Adverse Drug Reactions ◽

Medical Center ◽

Critical Role ◽

Drug Reactions ◽

Health Records ◽

Outpatient Parenteral Antimicrobial Therapy ◽

Initial Cohort ◽

Recorded Data ◽

Antimicrobial Regimen

Abstract Background The UNC Medical Center OPAT program was started in 2015 to provide multidisciplinary monitoring and management of patients discharged on parenteral antimicrobials. We examined characteristics of incident adverse drug reactions (ADRs) observed in our initial cohort of OPAT patients. Methods We abstracted electronic health records for the first 250 patients enrolled in the OPAT program. 223 patients with sufficient recorded data for entire OPAT course were included in the analysis. ADRs meeting criteria as detailed in Table 1 were collected and further stratified by antimicrobial regimen. Results 57 patients (26%) experienced at least one ADR during OPAT therapy. The frequency of specific ADRs associated with OPAT therapies are provided in Figure 1. Β-lactam regimens were most frequently associated with liver dysfunction, while combinations of β-lactams and vancomycin were associated with kidney dysfunction. Median days on OPAT regimen was 19 days (IQR: 10–29) for patients who experienced an ADR compared with 39 (IQR: 30–44) for patients who did not experience an ADR. Conclusion ADRs were most commonly observed within the first three weeks of therapy, particularly for patients receiving vancomycin and a β-lactam antimicrobial in combination. These results underscore the critical role of a multidisciplinary team in providing laboratory monitoring and response to abnormal results for OPAT patients. In addition, closer monitoring within the first three weeks of therapy may provide opportunities for regimen changes or dose adjustment to avoid toxicities. Disclosures All authors: No reported disclosures.

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