Dalbavancin Use Research Articles

998. Clinical Outcomes and Cost Savings of Dalbavancin Use in OPAT: Focus on Complicated Staphylococcus aureus Infections

Abstract Background The practical and financial benefits of long-acting glycopeptides are increasingly recognized, and their efficacy is becoming better established for a variety of indications. Dalbavancin use as primary therapy for complicated Staphylococcus aureus (cSA) infections, however, has only been described in small case series to this point. Methods This retrospective review identified patients prescribed dalbavancin for any indication and followed by the Nebraska Medicine OPAT team since program implementation (4/1/19 - 4/30/22). Patients in the cSA infection subgroup were defined by need for >2 weeks of treatment for a Staphylococcus aureus infection involving bacteremia. Dalbavancin as primary therapy for cSA was defined as initiation of dalbavancin within the first 10 days of antibiotic therapy and continued through the end of treatment. The primary clinical outcome was 30-day readmission rate (both infection-related and not infection-related). Results A total of 66 patients were prescribed dalbavancin for treatment of any infection (Table 1), with an all-cause 30-day readmission rate of 13.6% (9 of 66); only two of these were infection-related (3%). Updating a prior institutional analysis, use of dalbavancin led to the avoidance of 506 planned inpatient days per year on average and $1,113,000 in yearly inpatient costs. Dalbavancin was utilized for primary therapy of cSA in 16 patients, of whom only one (6.3%) had a 30-day readmission, due to progression of cSA vertebral osteomyelitis-discitis. Table 1:Characteristics of the Dalbavancin Cohort Conclusion In both overall and cSA subgroup analysis, OPAT use of dalbavancin was associated with low readmission rates. This study is the largest to date suggesting favorable clinical outcomes with dalbavancin as primary therapy for cSA infections; others have reported few of these patients or utilized dalbavancin exclusively as consolidation therapy following significant lead-in with other antimicrobials. The enrolling Dalbavancin as an Option for Treatment of Staphylococcus aureus Bacteremia study (DOTS; NCT04775953) is anticipated to provide randomized controlled data evaluating this approach. Discharge facilitation utilizing dalbavancin contributed significantly to OPAT program cost justification and resources to support team expansion. Disclosures Bryan T. Alexander, PharmD, BCIDP, AAHIVP, Astellas Pharma: Advisor/Consultant Scott J. Bergman, PharmD, BCIDP, FCCP, FIDSA, Merck & Co., Inc: Advisor/Consultant|Merck & Co., Inc: Grant/Research Support|Merck & Co., Inc: Honoraria|Pfizer: Advisor/Consultant|Pfizer: Honoraria Trevor C. Van Schooneveld, MD, bioMerieux: Advisor/Consultant|bioMerieux: Grant/Research Support|Insmed: Grant/Research Support|Merck: Grant/Research Support|Thermo-Fischer: Advisor/Consultant.

1730. Real-World Use Of Dalbavancin In A US Tertiary Referral Center

Abstract Background Dalbavancin is a lipoglycopeptide with prolonged half-life currently approved for treatment of bacterial skin and soft tissue infections. Off-label uses of dalbavancin include multiple Gram-positive infections requiring long-term antibiotics use. However, clinical data regarding Dalbavancin use in the real-world setting remains limited. Methods We conducted a retrospective cohort study of all adult inpatients who were administered ≥1 dose of Dalbavancin between November 2017 and March 2022. Results Forty-nine adults were identified. Dalbavancin was used to treat skin/soft tissue infections in 9 patients (18.8%). Off-label uses accommodated for the majority of patients, with diagnoses included: bloodstream infection (24, 50%), osteomyelitis (9,18.8%), native valve infective endocarditis (6,12.5%), native septic arthritis (6,12.5%), epidural abscess (4,8.3%), catheter-related bacteremia (3,6.3%) prosthetic joint infection (3,6.3%), and diabetic foot infection (1,2.1%). No patients with prosthetic valve infective endocarditis were identified. Staphylococcus aureus was the most common treated pathogen: MRSA (15, 35.7%), MSSA (17, 40.5%). Other pathogens included: Streptococcus (2,4.8%), Enterococcus (4,9.5%), coagulase negative Staphylococcus (5,11.9%), other gram positive (4,9.5%), none (2,4.8%). Among patients who completed therapy, overall cure, and clinical response as assessed at day 42 was achieved in 29 (96.7%) of patients,1 patient (3.3%) had relapse due to noncompliance with antimicrobial suppressive regimen. Intravenous drug use was the most common cause among patients who did not complete treatment (10, 58.8%). Adverse events included mild elevation in liver function tests, which were reversible and were not definitively related to the treatment. No rashes or infusion related reaction were reported. There were no adverse events resulting in drug discontinuation. Conclusion Real-world, including off-label, use of Dalbavancin appears safe and is associated with favorable treatment responses. Therefore, it should be considered as an alternative treatment approach in certain patient population including at risk population that may otherwise discharge from the hospital with no antimicrobial treatment or suboptimal oral antibiotics. Disclosures All Authors: No reported disclosures.

Evaluation of Dalbavancin in Vancomycin Allergic Patients: A Case Series

PurposeThere is a paucity of data regarding dalbavancin use in patients with a vancomycin allergy because of potential cross-reactivity between the 2 glycopeptide antibiotics. MethodsA retrospective medical record review was performed between February 2016 and February 2021 in patients with a listed vancomycin allergy who received dalbavancin as an outpatient infusion and had a listed vancomycin allergy in the electronic health record. FindingsThere were 559 unique patients during the study period who received dalbavancin as an outpatient infusion, 10 of whom had a documented vancomycin allergy in the electronic health record. Four of the 10 patients had a history of a type I IgE-mediated reaction to vancomycin, 1 patient reported delayed rash, 2 patients reported a vancomycin infusion reaction, 2 patients reported acute kidney injury, and 1 patient reported intolerance with general malaise. All 10 patients received at least 1 dose of dalbavancin with no reported adverse events. ImplicationsThis case series displays that all patients who received dalbavancin tolerated the infusion well with no adverse events reported. Dalbavancin may be a viable option for patients with a listed vancomycin allergy.

Evaluating the Use of Dalbavancin for Off-Label Indications.

(1) Background: Dalbavancin is a long-acting lipoglycopeptide antibiotic approved for skin and soft-tissue infections. Post-marketing experience suggests dalbavancin is being used for off-label indications that normally require long-term intravenous (IV) antibiotics; however, data assessing this off-label usage are limited. The purpose of this study was to evaluate the real-world efficacy, safety, and financial impact of off-label dalbavancin use. (2) Methods: This is a retrospective, observational study conducted within a 4-hospital health system. Adult patients who received dalbavancin from January 2018 to January 2021 for an off-label indication were included. The primary outcome was clinical success at 90 days. Secondary outcomes included safety (nephrotoxicity and hepatotoxicity). A pharmacoeconomic analysis was performed by comparing the cost of dalbavancin to the anticipated cost of patient stay if standard IV therapy was given. (3) Results: Forty-eight patients met study criteria. Indications included osteomyelitis (54%), endocarditis (23%), bacteremia (15%), and prosthetic joint infection (8%). The predominant organism was S. aureus (60%), with 42% caused by methicillin-resistant S. aureus. Overall, 41 (85%) patients achieved clinical success at 90 days, including 85% with osteomyelitis, 82% with endocarditis, and 86% with bacteremia. There were no instances of nephrotoxicity or hepatotoxicity. Estimated cost avoidance per patient was USD 5313 and USD 1683 if traditional IV therapy would have been completed in the hospital and skilled nursing facility, respectively. (4) Conclusion: Dalbavancin was associated with a relatively high success rate for the treatment of off-label indications and may be a cost-effective alternative to traditional IV antibiotic therapy.

Dalbavancin in Real Life: Economic Impact of Prescription Timing in French Hospitals.

IntroductionThe extended half-life of dalbavancin justifies a once-a-week dosing schedule and is supposed to favour early discharge. These advantages may therefore compensate for the cost of dalbavancin, but no real-life assessment has been conducted to date. We aimed to assess the real-life budget impact of dalbavancin through its impact on the length of stay in French hospitals.MethodsA multicentre cohort based on the French registry of dalbavancin use in 2019 was compared to the French national discharge summary database. Lengths of stay and budget impact related to the infection type, the time of introduction of dalbavancin, the type of catheter and patient subgroups were assessed. An early switch was defined when dalbavancin was administered as the first or second treatment and within less than 11 days of hospitalization.ResultsA total of 179 patients were identified in the registry, and 154 were included in our study. Dalbavancin was mostly used for bone and joint infections (56.0%), infective endocarditis (19.0%) and acute bacterial skin and skin structure infections (6.0%). When compared to the data for similar patients in the national database, the length of stay was almost always shorter for patients treated with dalbavancin (up to a reduction of 13 days). The budget impact for dalbavancin was heterogeneous but frequently generated savings (up to 2257.0 €). Early switching (within less than 11 days) was associated with savings (or lesser costs), with even greater benefits within 7 days of hospitalization. Patients who required a deep venous catheter as well as the most severe patients benefited the most from dalbavancin.ConclusionOur study confirms that dalbavancin is associated with early discharge, which can offset its cost and generate savings. The greatest benefit is achieved with an early switch.Supplementary InformationThe online version contains supplementary material available at 10.1007/s40121-021-00577-6.

1365. Clinical and Financial Implication of Dalbavancin Utilization on Length of Stay Avoidance in Acute Bacterial Skin and Skin Structure Infection

BackgroundOur institution admits 650 patients annually for acute bacterial skin and skin structure infection (ABSSSI). These patients may require intravenous antibiotics, potentially complicated by social factors and loss to follow up. Dalbavancin is a long-acting lipoglycopeptide given as a single dose regimen for ABSSSI. A previous review conducted at our institution identified 117 potential avoidable hospital days over 4 months with outpatient dalbavancin use. The objective of this prospective study was to evaluate the clinical and financial impact of avoided admissions with outpatient dalbavancin use.MethodsThe Institutional Review Board approved this single-site, prospective study. All patients who presented to the emergency department (ED) with ABSSSI from December 15, 2020 to April 15, 2021 were included in the study. Dalbavancin eligibility criteria were given to providers. Eligible patients were given a single dose of dalbavancin and then discharged. The primary outcome was the difference between percentage of avoidable admissions from the ED with dalbavancin use in the retrospective cohort and prospective cohort. The secondary outcomes were estimated length of stay avoidance, percentage of treatment success without ED re-visit within 30 days, estimated hospital cost avoidance and drug cost reimbursement. The primary outcome was assessed using the Chi-square test. Descriptive statistics were used for the secondary outcomes.ResultsFourteen patients received dalbavancin and avoided hospital admissions. The percentages of admissions avoided in the retrospective and prospective cohorts were 16.02% and 6.67%, respectively (Figure 1). A difference of 9.35% was found to be statistically significant (p=0.01). The total estimated length of stay avoidance was 50 days. No patients re-visited the ED within 30 days with treatment failure. The total estimated hospital cost avoidance was &148,852 (Table 1). The net reimbursement for dalbavancin over drug cost was &5,100 (Table 2). ConclusionDalbavancin use decreased avoidable admissions. At our institution, annual hospital cost savings can reach &1,015,794 if dalbavancin was utlilized to all eligible patients.Disclosures All Authors: No reported disclosures

234. Dalbavancin versus Outpatient Parenteral Antimicrobial Therapy with Vancomycin for Treatment of Bone and Joint Infections in a Veteran Population

BackgroundDalbavancin is a long-acting lipoglycopeptide with broad gram-positive activity. A long half-life makes it an attractive treatment option for bone and joint infections (BJI). Previous studies have demonstrated efficacy of dalbavancin in the treatment of BJI. Based on these studies, our institution established a protocol for using dalbavancin as an alternative to IV antibiotics via PICC line. MethodsChart review was performed to compare outcomes of patients who were treated with dalbavancin versus vancomycin for BJI from 8/2017 –7/2020. Patients that received two doses of dalbavancin for BJI were compared with patients who received OPAT with vancomycin during the same time period. Patients were excluded if they were bacteremic or received dalbavancin for another indication. Data was collected from the Veterans Health Administration’s Corporate Data Warehouse and retrospective chart review. No statistical analyses were performed due to the descriptive nature of this study.ResultsA total of 59 patients were included; 25 received dalbavancin and 34 received vancomycin. Relevant differences in baseline characteristics included a higher proportion of patients with osteomyelitis (88% vs 74%) and refractory infection (64% vs 44%) in the dalbavancin group. More patients in the dalbavancin group (38% vs 24%) were readmitted for the same infection within one year, required (29% vs 21%) additional surgical intervention, and had increased CRPH on follow-up labs (32% vs 3%). Dalbavancin use likely expedited discharge in at least 5 cases where vancomycin levels were not therapeutic. No significant adverse effects due to dalbavancin were noted, aside from one patient with an increase in serum creatinine. In the vancomycin group, 8 patients changed antibiotics due to adverse effects or difficulty managing levels and 3 patients had ED visits for PICC line care.ConclusionDalbavancin may be a safe PICC-sparing treatment for BJI, particularly in cases where compliance is of concern, or there are logistical or tolerability issues with vancomycin. Our findings do raise concern for worse outcomes with dalbavancin, but the small sample size, difference in baseline characteristics between groups and descriptive nature of the study preclude any conclusions from being drawn. Disclosures All Authors: No reported disclosures

687. Use of Dalbavancin in Gram-positive Infective Endocarditis: Review of Current Literature

BackgroundDalbavancin is a long acting, semisynthetic derivative of teicoplanin that is currently approved for treatment of acute bacterial skin and skin structure infections. Its efficacy and role of in the treatment of invasive infections, in particular infective endocarditis, is not well known.MethodsWe reviewed the English-language literature for the use of Dalbavancin in the treatment of endocarditis due to Gram-positive organisms, using Pubmed.Results15 publications were reviewed. All the publications were retrospective in nature, with relatively small numbers of patients, including a few case reports.A total of 159 patients received Dalbavancin for endocarditis. The mean age was 47 years. The main reasons for using Dalbavancin were non-feasibility of a standard outpatient regimen (mainly due to drug use) or the need for a simpler regimen. 75 patients had infection of a native valve, 44 of a prosthetic valve and 19 of a cardiac device. The type of infection for the rest of the patients was not specified. The tricuspid valve was the most frequently reported. The etiologic organisms causing endocarditis were Staphylococcus species, followed by Streptococcus species and Enterococcus species, with Staphylococcus aureus being the most common. All, but one, patients received Dalbavancin as sequential therapy, after receiving other intravenous antibiotics initially. The duration of antibiotics received prior to initiation of Dalbavancin was variable, with the median being 3 weeks. The median duration of Dalbavancin use was 2.7 weeks. The dosage regimens varied, with the more common ones using a loading dose of either 1500 mg or 1000 mg, followed by one or more weekly doses of 500 mg. The overall clinical efficacy was around 89%. Adverse events were mild, including nausea, vomiting, rash, headache and reversible acute kidney injury. None of the patients had to discontinue the drug because of adverse events. Two publications evaluated the cost effectiveness of Dalbavancin and found it to save about &9000 per patient, the saving being mainly due to reduced length of hospital stay.ConclusionDalbavancin appears to be an efficacious, safe and cost-effective option for sequential treatment of endocarditis caused by Staph aureus and other Gram-positive organisms.Disclosures All Authors: No reported disclosures

108. Evaluation of the Impact of Dalbavancin Usage on Clinical Outcomes, Cost-Savings, and Adherence at a Large Safety Net Hospital

BackgroundDalbavancin is a long-acting second-generation lipoglycopeptide antibiotic with potent activity against Gram-positive organisms. Dalbavancin is currently FDA approved for acute bacterial skin and soft tissue infections (ABSSTIs). Growing evidence suggests that patients can be successfully treated with dalbavancin for indications outside of skin and soft tissue infections which include bacteremia and osteomyelitis (OM) with significant cost savings and reduced length of stay. We developed a protocol for the use of dalbavancin in patients who required intravenous antibiotics for serious bacterial infections but did not qualify for outpatient parenteral antibiotic therapy (OPAT). During the COVID-19 pandemic, we expanded the protocol to reduce the amount of clinical contact required for all patients.MethodsIn this retrospective observational study, we reviewed all patients that received at least one dose of dalbavancin in either inpatient or outpatient setting at Parkland Hospital from July 2019 through February 2021. Patient demographics, type of infection, and rationale for dalbavancin were collected at baseline. Clinical response was measured by avoidance of Emergency Department (ED) visits or hospital readmission at 30, 60, and 90 days. In addition, a separate analysis was conducted to estimate hospital, rehabilitation, or nursing home days saved based on their diagnosis and projected length of treatment. ResultsTwenty-eight patients (24 inpatient, 4 outpatient) were included in the study. The majority were uninsured (89%), homeless (64%), or had active intravenous drug use (IDU) (60%). Indications for use included SSTI (42.9%), bacteremia (64.3%), and OM (42.6%). Clinical failure was observed in 4 (14%), 1 (3.5%), and 2 (7.1%) patients at 30, 60, or 90 days (respectively). Nonadherence to medical recommendations, lack of source control, and ongoing IDU increased risk of returning to the hospital. Dalbavancin use saved a total of 381 days of inpatient/rehab/facility stay. Baseline Characteristics of Patients Types of Infections and Microbiology ED Visit or Readmissions at 30, 60, or 90 DaysConclusionDalbavancin showed similar rates of success with improved length of stay and cost savings. The use of long acting lipoglycopeptides are desirable alternatives to traditional OPAT for patients that otherwise would not qualify for OPAT or desire less hospital contact.Disclosures All Authors: No reported disclosures

Dalbavancin treatment for prosthetic joint infections in real-life: a national cohort study and literature review

Dalbavancin is a long-lasting lipoglycopeptide active against Gram-positive bacteria, especially methicillin-resistant staphylococci. Few data are available on dalbavancin use for treatment of prosthetic joint infections (PJIs). We describe a cohort of patients treated for PJI with dalbavancin and review the literature regarding this condition. All adult patients with PJI from the French dalbavancin national cohort from 1 June 2017 to 1 January 2019 were included. We collected clinical and microbiological characteristics and outcome through a standardised questionnaire. Clinical cure was defined as absence of clinical signs of infection at last visit. Failure was a composite criterion defined by persistence or reappearance of signs of infection, and/or switch to suppressive antibiotic treatment and/or death from infection. The literature review was performed using PubMed. Seventeen patients were included. Bacteria were identified in 16 cases: Staphylococcus aureus (n=10), including methicillin-resistant S. aureus (n=1); and coagulase-negative staphylococci (n=10), including methicillin-resistant Staphylococcus epidermidis (n=4). Sixteen patients (94.1%) had received antibiotic therapy prior to dalbavancin use (mean of 2.2 ± 1.3 lines). Clinical cure was achieved in 8/17 patients after a median follow-up of 299.0 (IQR 97.0-476.0) days. We reviewed all cases of PJI treated with dalbavancin available in the literature and the overall clinical cure was estimated at 73.1%. Our study and literature data suggest that use of dalbavancin in PJI could be considered, even as salvage therapy. Dalbavancin appears to be a safe and easy treatment for patients with staphylococcal PJIs.

Role or oritavancin and dalbavancin in acute bacterial skin and skin structure infections and other potential indications.

To discuss the currently available evidence about the use oritavancin and dalbavancin for the treatment of acute bacterial skin and skin structure infections (ABSSSI) and for other potential indications. In this review, we briefly summarize the available data on efficacy (from randomized controlled trials) and on effectiveness and cure rates (from observational studies) pertaining to the use of oritavancin and dalbavancin either for ABSSSI or for other indications. Oritavancin and dalbavancin are valid options for outpatient therapy and early discharge in patients with ABSSSI, especially when adherence to oral therapy cannot be guaranteed or no oral choices are available. Furthermore, it is worth noting that a non-negligible portion (sometimes the majority) of oritavancin and dalbavancin use in available real-life experiences is for indications other than ABSSSI, especially for Gram-positive osteomyelitis and endocarditis. The number of studies on the use of long-acting lipoglycopeptides for these currently off-label indications is rapidly increasing and will help to further optimize the use of these peculiar antibiotics in the forthcoming future.

1268. Dalbavancin for the Treatment of Infections due to Staphylococcus aureus

BackgroundDalbavancin is a lipoglycopeptide antibiotic active against gram-positive organisms. Its extended half-life allows for weekly dosing that can last 4 to 6 weeks with 2 doses. Although approved for treating skin and soft tissue infections, use for more complicated infections is appealing, particularly when daily intravenous antibiotics are impractical. S aureus is the most common cause of complex infections for which dalbavancin is considered at our institution, so we sought to better understand its use.MethodsWe conducted a retrospective study to describe dalbavancin use at our institution for infections caused by Staphylococcus aureus. We identified all patients ≥18 years who received ≥1 dose of dalbavancin. Infectious disease faculty reviewed charts for clinical characteristics and outcomes of the infections.ResultsFifty-two patients with S. aureus infections (60% MRSA) were treated with at least a partial course of dalbavancin. Twenty-seven (52%) had a history of IV drug use (IDU) and the most common infections were bone and joint infection in 51% and bacteremia in 40% (Table 1). The most common dosing regimen was 1500 mg x 1 in 55% or 1500 mg weekly x 2 in 25% (Table 2). The most common reasons for use of dalbavancin were history of IDU in 48% and lack of a safe home environment in 21%. Suppressive oral antibiotics for the primary infection were prescribed to 3 patients after completing dalbavancin (2 received for other indications). Clinical outcomes include 15% of patients lost to follow-up, readmission due to infection recurrence or dalbavancin adverse effects in 12%, and overall infection recurrence or relapse by day 90 in 31% (Table 3). There were no severe dalbavancin-related adverse drug events.Table 1. Patient and Disease Characteristics Table 2. Dalbavancin Use Characteristics Table 3. Clinical Endpoints ConclusionWhile our results suggest dalbavancin is well tolerated, questions about relapse rates in the treatment of complicated S. aureus infections remain. Further research is needed to evaluate clinical outcomes for dalbavancin compared to standard of care antibiotics and to better elucidate whether relapses were related to true antibiotic failure versus other complexities of the S. aureus infections.Disclosures All Authors: No reported disclosures

314. A Retrospective Review of Dalbavancin Utilization at an Academic Medical Center

BackgroundDalbavancin is a novel long-acting lipoglycopeptide with increasing utilization for management of bone and joint infections as a two-dose regimen. The purpose of this study is to describe the patient characteristics, evaluate clinical outcomes, and calculate inpatient hospital days saved with use of dalbavancin as outpatient parenteral antimicrobial therapy (OPAT).MethodsA retrospective review of patients treated with dalbavancin at University Hospital was conducted from Aug 2019- March 2020. Patients ≥ 17 yrs of age with plan to receive at least 1 dose of dalbavancin were included. All patients were initially evaluated by, and had clinic follow up with, an infectious disease physician. Information on baseline demographics, infection characteristics, treatments, and outcomes were recorded from the EMR.Results42 patients met the study criteria. 62% were males with a median age of 49 yrs. 67% of patients had diabetes and 12% had a documented history of intravenous drug use. The most common indication was osteomyelitis (71%). S. aureus was the most commonly isolated organism in monomicrobial infections (MRSA 24%, MSSA 9.5%) and often a component of polymicrobial infections (33%). 90.5% of patients were adherent to their prescribed therapy; 1 patient missed both doses and 3 only received 1 of their recommended doses. Adverse effects were mild and noted in only 4 patients. 24 patients (57%) received concomitant antibiotics. 45% of patients achieved a cure with another 12% were classified as improved but requiring further antibiotics. 31% (N=13) had failure of therapy of which, 69% (N=9) did not achieve prior source control. 5 patients were lost to follow up. Our health system saved 160 inpatient days through dalbavancin use.ConclusionDalbavancin treatment had a high adherence rate with minimal adverse effects and achieved a positive outcome in 57% of patients. Of patients that failed, the majority did not have appropriate source control. Dalbavancin use has the potential to save inpatient days while offering a more convenient option for treatment. However, further studies should be conducted to evaluate its efficacy in comparison to standard of care therapy at our institution.Disclosures All Authors: No reported disclosures

122. Dalbavancin Use in Patients with Substance Use Disorders

BackgroundDalbavancin, a lipoglycopeptide antibiotic, has an extended half-life that allows for weekly dosing and is an alternative to daily intravenous (IV) antibiotics. The dosing interval has the potential to expand treatment options for more severe infections in patients with substance use disorder (SUD), houselessness, and other complex social determinants of health where treatment of severe infections with long courses of IV antibiotics can have a high risk of failure. Questions remain regarding clinical outcomes for this indication and patient population.MethodsWe conducted a retrospective review of dalbavancin use for any patient with documented SUD either by ICD-10 or in chart notes. We identified all patients > 18 years who received > 1 dose of dalbavancin via medication records.Results53 patients with documented SUD received dalbavancin as part of their treatment regimen (Table 1). The most common indication was osteomyelitis, including 14 cases of vertebral osteomyelitis (Table 2). The most common causative organism was Staphylococcus aureus, 23 (43%) cases due to MRSA and 10 (18%) due to MSSA.The majority of patients (41,77%) had a documented history of IV drug use (IDU) and 19% had alcohol use disorder. A structured, RN-lead multi-disciplinary discharge planning conference to discuss antibiotic options, risk factors for outpatient parenteral antibiotic therapy, and PICC safety in the community was held for 17 (32%).Concern about outpatient PICC safety in patients with history of IDU, unsafe home environment, and prior non-adherence to outpatient antibiotics were common reasons for choosing dalbavancin. Ten (19%) patients were lost to follow-up. The 30 and 90-day readmission rates were 13% and 19% respectively but were due to relapse or recurrence of infection in only 3 (6%) at 30 days and 2 (4%) additional at 90 days. There was only one death at 90 days ant it was unrelated to infection. (Table 3) Table 2. Dalbavancin Use ConclusionDalbavancin was well tolerated and = a viable alternative for patients with SUD who often have social factors and preferences that make continuation of outpatient IV therapy high risk or impractical. Further data on clinical outcomes in complex infections is needed.Disclosures All Authors: No reported disclosures

Comparison of dalbavancin to standard-of-care for outpatient treatment of invasive Gram-positive infections

Objective: To assess the efficacy and safety of dalbavancin compared to standard-of-care (SOC) or vancomycin and daptomycin in invasive infections due to suspected or confirmed Gram-positive organisms.Methods: Retrospective cohort of adults who received dalbavancin or SOC on discharge or as an outpatient from 12/2016 to 11/2019. Indications were osteoarticular infection (OAI), infective endocarditis (IE), or other bloodstream infection (BSI). Primary endpoint was 90-day infection-related readmission (IRR); secondary endpoints included time-to-IRR, frequency of adverse drug events (ADEs), and all-cause readmission and mortality.Results: 215 patients were included: 70 (33%) receiving dalbavancin, and 145 (67%) receiving SOC. Indications were OAI (47%), IE (27%), and other BSI (26%). OAI was more common in patients on dalbavancin compared with those receiving SOC (70% vs. 37%, P<0.001). Dalbavancin patients had shorter median (interquartile range [IQR]) length of stay (LOS) prior to drug initiation compared with those receiving SOC (10 [7-17] vs. 13 [9-19], P=0.021). IRR incidence was 17% for dalbavancin patients and 28% for SOC patients. Dalbavancin use was independently associated with lower IRR (adjusted odds ratio [adjOR], 0.10; 95% confidence interval [CI], 0.04-0.31). There was longer median (IQR) time-to-IRR in the dalbavancin group (43 [30-87] vs. 23 [11-63] days, P=0.039), but no differences in all-cause readmission or mortality. Treatment-related ADE incidence was 3% and 14% for the dalbavancin and SOC groups, respectively (P=0.013). Infusion reactions (1/2) and catheter-related complications (1/2) were the most common dalbavancin ADEs; catheter-related complications (14/21), nephrotoxicity (3/21), rhabdomyolysis (2/21), and rash (2/21) were the most common SOC ADEs.Conclusions: Dalbavancin use was associated with lower 90-day IRR, a shorter hospital LOS prior to therapy, and longer time-to-IRR compared with SOC.

Dalbavancin in the Treatment of Bacteremia and Endocarditis in People with Barriers to Standard Care.

Introduction: Dalbavancin is an antibiotic administered by intravenous infusion weekly or bi-weekly and is currently FDA-approved only for treatment of skin and soft-tissue infections. It has shown promise, but is not considered the standard of care, for bacteremia and infective endocarditis (IE), which typically require outpatient parenteral antibiotic therapy (OPAT) for prolonged durations. People who inject drugs (PWID) with bacteremia or IE are often perceived as having barriers to OPAT and standard daily-administered antibiotics, prompting off-label use of dalbavancin in this population. Methods: A retrospective review of adult patients receiving at least one dose of dalbavancin for bacteremia or IE was conducted between 1 November 2017 and 31 October 2019. Outcomes and reasons for use of dalbavancin were recorded, including specific barriers to standard therapy. Results: Stated reasons for dalbavancin use in the 18 patients identified included active injection drug use (50%), inability to arrange standard OPAT due to patient adherence or inability to place in skilled nursing facility (SNF) (22%), risk for additional infections or other morbidity with OPAT (22%), and patient preference (6%). In 11 patients (61%) SNF placement was not attempted due to behavioral issues or patient declination. There were five patients who did not complete their intended course of treatment (28%). At 90 days, eight patients (44%) achieved a clinical or biologic cure, six (33%) failed treatment, and four (22%) were lost to follow-up. Conclusion: Dalbavancin may have a role as salvage therapy in the treatment of IE and bacteremia in PWID who have significant barriers to standard treatment.

1028. Dalbavancin Use in Complicated Infections and-associated Cost-Savings

BackgroundDalbavancin is a lipoglycopeptide antibiotic active against Gram-positive organisms with an extended half-life that allows for weekly dosing. Initially approved for treating skin and soft-tissue infections, use for more complicated infections provides several potential benefits, particularly in the outpatient setting when daily intravenous antibiotics are not practical due to social or financial issues.MethodsWe conducted a retrospective study to describe dalbavancin use at our institution and to estimate resulting cost avoidance. We identified all patients aged 18 years or older who received at least one dose of dalbavancin via medication records, regardless of setting.Results46 patients received dalbavancin between April of 2015 and March of 2019. The most commonly treated infections were bone and joint infections (41%), complicated bacteremias (24%), and skin and soft-tissue infections (20%). The most commonly treated organism was Staphylococcus aureus (55%). A variety of dosing regimens were used, 26 patients (57%) received a single dose to complete a treatment course. The majority of doses were administered in an outpatient infusion center (61%) although 28% of doses were administered in the inpatient setting prior to discharge. Reasons for dalbavancin selection included history of intravenous drug use (35%), contraindications to alternative antibiotics (30%), prior history of nonadherence or manipulation of PICC (18%), other social issues preventing PICC (11%), and limited outpatient daily infusion options due to lack of funding (9%). 4 patients (8.7%) were lost to follow-up. 11 (24%) patients were readmitted to the hospital within 30 days, 2 (4%) of these patients were readmitted with a concern related to their infection or an adverse effect of the dalbavancin infusion. Based on a calculation of equivalent dalbavancin therapy days for each patient, 774 hospital days were saved. In total, this is estimated to be $1,885,479 in overall cost avoidance and a mean cost avoidance of $40,988 per patient.ConclusionAs data regarding the efficacy of dalbavancin for more complicated infections continue to emerge, it should be considered as a cost-effective alternative therapy when social and financial factors limit treatment options.Disclosures All authors: No reported disclosures.

754. Evaluation of Standardized Dalbavancin Use to Facilitate Early Hospital Discharge for Patients Inappropriate for Outpatient Parenteral Antibiotic Therapy

BackgroundPatients frequently remain in the hospital for prolonged intravenous (IV) antibiotic therapy for serious infections when outpatient IV antibiotic therapy is unsafe or unfeasible. A protocol was developed to facilitate early discharge by administering one dose of dalbavancin 7 – 10 days prior to the planned end of treatment, allowing patient discharge the same day as the infusion. The purpose of this analysis was to describe the effectiveness, safety, and financial impact by using dalbavancin to facilitate early discharge.MethodsThis is a retrospective observational analysis of all inpatients who received dalbavancin at Denver Health Medical Center from April 2018 to April 2019. One dose of dalbavancin 1,500 mg was administered over 30 minutes to each patient. The medical record was reviewed 30 days after discharge to determine safety (adverse reaction to dalbavancin) and effectiveness (readmission or receipt of additional antibiotics). The estimated cost of one hospital day was $1,800; one dose of dalbavancin costs $3,000.ResultsSixteen patients (69% male; average age 45 years) received dalbavancin. The majority of patients were homeless (81%), injection drug users (75%), and infected with HCV (56%). One patient was infected with HIV (6%) and none had diabetes, kidney disease, or cirrhosis. Antibiotics administered prior to dalbavancin were vancomycin or cefazolin, based on organism, for a median duration of 25 days (IQR 11–34). Patients were infected with methicillin-resistant S. aureus (n = 8), methicillin-susceptible S. aureus (n = 7), and one co-infection with S. epidermidis and S. pyogenes. The infections included complicated bacteremia (n = 6), uncomplicated bacteremia (n = 4), osteomyelitis (n = 2), right-sided endocarditis (n = 2), and osteomyelitis with bacteremia (n = 2). No adverse reactions were noted. Readmission 30 days from discharge occurred for two patients for reasons unrelated to the infection or dalbavancin. None received additional antibiotics. 115 hospital days were averted (average of 7 days per patient). Cost savings to the hospital were estimated to be $159,000.ConclusionA standardized approach to use dalbavancin for serious infections to facilitate early hospital discharge appears to be safe and effective and led to substantial cost savings.Disclosures All authors: No reported disclosures.

Dalbavancin use in an academic medical centre and associated cost savings

Dalbavancin is a lipoglycopeptide antibiotic with unique weekly dosing active against Gram-positive organisms. This retrospective study included 37 patients receiving a mean of 2.7 weeks of dalbavancin. Nine patients (24%) were re-admitted to the hospital within 30 days. A total of 617 hospital days were saved, estimated to result in US$1 495 336 in savings and a mean cost avoidance of US$40 414 per patient. Dalbavancin provides a valuable antibiotic option that may minimise healthcare expenditure.

Dalbavancin Use in the Emergency Department Setting.

Background: Although dalbavancin's (DBV's) long half-life and one-time dosing strategy confer ideal administration in the ambulatory setting, the optimal role of DBV in the management of acute bacterial skin and skin structure infections (ABSSSIs) remains to be elucidated. Objectives: The primary objective of this study was to compare treatment outcomes of ABSSSI between patients who received DBV in the emergency department (ED) as part of standard care versus patients who received DBV as part of a telehealth program. Methods: This was a retrospective cohort study evaluating patients who received DBV at 3 urban EDs. The primary end point was the incidence of ABSSSI recurrence. Secondary outcomes included need for hospital admission and ED length of stay (LOS; in hours). Results: A total of 65 ABSSSI treatment courses were included; 42 were included in the telehealth criteria (TC) cohort and 23 in the initial criteria (IC) cohort. There were 14% (6/42) infection recurrences in the TC cohort and 22% (5/23) in the IC cohort, with median time to recurrence being 4 and 14 days, respectively. Median ED LOS was significantly shorter in the TC (5 vs 25 hours, P < 0.05). Numerically fewer individuals in the TC cohort required inpatient admission (0 vs n = 2, 9%). Conclusion and Relevance: Our results suggest that patients may be safely administered DBV in an ED setting, with telehealth follow-up. Providing structured patient selection criteria is an effective method of assisting ED providers in selecting appropriate DBV candidates to limit potential recurrences and readmissions.