id000043
10.3205/id000043
urn:nbn:de:0183-id0000434
Research Article
Potential savings through single-dose intravenous Dalbavancin in long-term MRSA infection treatment – a health economic analysis using German DRG data
Wilke
Wilke
Michael
M
inspiring-health GmbH, Munich, Germany
author
Worf
Worf
Kerstin
K
inspiring-health GmbH, Munich, Germany
author
Preisendörfer
Preisendörfer
Birgit
B
inspiring-health GmbH, Munich, Germany
author
Heinlein
Heinlein
Wolfgang
W
inspiring-health GmbH, Munich, Germany
author
Kast
Kast
Tilman
T
inspiring-health GmbH, Munich, Germany
author
Bodmann
Bodmann
Klaus-Friedrich
KF
Klinikum Barnim GmbH, Werner Forßmann Krankenhaus, Eberswalde, GermanyKlinikum Barnim GmbH, Werner Forßmann Krankenhaus, Eberswalde, Germany
kf.Bodmann@klinikum-barnim.de
author
German Medical Science GMS Publishing House
Düsseldorf
610
single-dose intravenous Dalbavancin
health economic model
length of stay
cost savings
20191023
engl
This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License.
Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung).
2195-8831
7
GMS Infectious Diseases
GMS Infect Dis
03
Complicated infections such as osteomyelitis, skin and soft tissue infections or endocarditis often require antibiotic therapies that can last up to several weeks. The prolonged hospital length of stay (LOS) leads to a dramatic increase in costs. Single-dose intravenous Dalbavancin is a novel antimicrobial agent for the treatment of acute bacterial skin, skin structure and soft tissue infections (ABSSSI) that allows an earlier discharge of patients, resulting in potential savings. Joint, bone and prostheses infections (JBPI) are also related with long LOS. The aim of this study is to determine the economic effects of single-dose intravenous Dalbavancin in suitable patients with Methicillin-resistant Staphylococcus aureus infections in Germany. For this purpose, an analysis with real-world patient treatment data was performed, which was subsequently validated in a large German hospital. In total, ABSSSI patients with MRSA infections could stay 6.45 days shorter and 2,865 € could be saved while JBPI patients could be discharged eventually 10.6 days earlier and 3,909 € could be saved. Single-dose intravenous Dalbavancin is thus an option for patients with ABSSSI and JBPI who are eligible for discharge.
IntroductionComplicated infections often require a long antibiotic therapy period. Especially in diseases such as osteomyelitis, skin and soft tissue infections or endocarditis, antibiotic durations up to 3–6 weeks are possible , , , , , , , . Patients with Methicillin-resistant Staphylococcus aureus (MRSA) infections stay in hospital for even longer , . As hospitals in Germany are funded by diagnosis-related group (DRG) payments per case, the length of stay (LOS) has become a critical economic factor , , , , , . With this in mind, reducing the LOS seems to be an economically viable option. Studies show that early discharge and outpatient continuation of antibiotic therapy, for example by oralization, may lead to savings , , , . Oralization is often accompanied by problems related to patients’ compliance. Other problems are that sometimes because of intolerance or resistance, no oral option is available. With Dalbavancin, however, a novel antimicrobial agent is available that enables an intravenous single-dose with an extremely extended half-life in Gram-positive bacteria. Dalbavancin thus gives clinicians the opportunity to provide an antibiotic that is proven to be as effective as conventional therapies without the need for prolonged hospitalization drastically reducing the LOS and the total cost per patient . The aim of this study is to determine the economic effects that could be achieved by single-dose intravenous Dalbavancin in suitable patients with MRSA infections in Germany.
MethodsIn Germany, inpatient cases are reimbursed using a fee-per-case system (DRG system) based on the principle “same money for same service”. This poses a challenge for hospitals as cost-covering performance can only be provided up to a certain point in time after which the costs exceed the revenues. The calculation basis of the Institute for Hospital Reimbursement (InEK) is the average cost per DRG of all hospitals participating in this calculation. For each DRG, LOS thresholds are defined as the lower trimpoint LOS (ltpLOS), average LOS (aLOS) and upper trimpoint LOS (htpLOS) , , , . If the average LOS is exceeded, the patient's LOS represents a cost driver for the hospital within the DRG system. Patients with MRSA infections often have significantly longer LOS and are therefore above the average lengths of hospital stay. Exceeding the LOS is associated with increased costs, which is why these patients cause a loss for the hospital , , .In order to evaluate possible cost savings, an economic model was developed based on the assumption that there is a cohort of patients with MRSA infections who are <![CDATA[basically</PlainText></TextGroup> dischargeable but only remain in hospital for the administration of a necessary intravenous antibiotic therapy. Using the example of Dalbavancin, an antimicrobial agent for the treatment of acute bacterial skin, skin structure and soft tissue infections (ABSSSI) in gram-positive pathogens, it was calculated to what extent a hospital could benefit from shortening the inpatient stay of suitable patients.</Pgraph><Pgraph>With a terminal half-life of >14 days, Dalbavancin can be administered via an intravenous single-dose of 1,500 mg <TextLink reference="28"></TextLink> which enables the hospital to discharge the patient under the protection of an optimal antibiotic therapy. Dalbavancin thus provides a dosing regimen with infr<TextGroup><PlainText>equent</PlainText></TextGroup> parenteral administration to treat infectious <TextGroup><PlainText>diseases</PlainText></TextGroup> that otherwise require daily intravenous therapy for many weeks <TextLink reference="28"></TextLink>. To estimate possible savings through single-dose intravenous Dalbavancin in patients with MRSA infections, clinical entities that are often associated with MRSA infections and that bare the option of early discharge were described. For the ABSSSI group, we used the FDA definitions <TextLink reference="29"></TextLink>. On top of these, we defined a group of joint, bone and prostheses infections (JBPI), where infection treatment is often long and single-dose administration could be a tool for shortening LOS in hospital. Table 1 <ImgLink imgNo="1" imgType="table"/> shows the classification of the entities. A table that includes the ICD-10 codes used is provided in Attachment 1 <AttachmentLink attachmentNo="1"/>.</Pgraph><Pgraph>As infections and especially infection with MRSA negatively impact the LOS of patients, we needed data to compare the aLOS of the DRG – which is always a mix of patients with no infections, with infections and with MRSA infections as most DRGs are not specifically designed for infection patients – with the LOS of infection patients and MRSA infection patients in the respective infection groups. This analysis was done on a large benchmarking database, in which 300 hospitals participated and about four million cases are registered annually. In order to understand the variation, all cases in the above-mentioned infection groups from 2016 were analysed <TextLink reference="30"></TextLink>.</Pgraph><Pgraph>To assess possible savings, a 3:1 propensity score matching was performed. Matched were the infection cases with MRSA infection cases against infections without MRSA from the two groups (ABSSSI and JBPI) using age, sex, principle diagnosis, DRG and comorbidities (via Charlson Comorbidity Index – CCI) in order to control confounders for costs, using a caliper of 0.1. The difference in costs and aLOS were then analysed.</Pgraph><Pgraph>According to the literature, the proportion of patients with ABSSSI who could be discharged earlier through oralization is 37.9 percent <TextLink reference="17"></TextLink>. Within the model, it was assumed that the same proportion of patients who could potentially receive single-dose intravenous Dalbavancin also applies to wound infections. Therefore we assumed that 37.9 percent of all MRSA patients could benefit from single-dose intravenous Dalbavancin.</Pgraph><Pgraph>The difference in costs between infections without and with MRSA was taken as possible savings. The total result was calculated by taking into account these savings as well as adding the treatment costs (2,280 € per <TextGroup><PlainText>1,500 mg</PlainText></TextGroup> dose).</Pgraph><Pgraph>After the analysis the proportion of patients and the shortening of LOS were validated by a case-review in a large major urban hospital.</Pgraph></TextBlock>
<TextBlock linked="yes" name="Results">
<MainHeadline>Results</MainHeadline><Pgraph>Case data from 171,074 patients in the respective infection groups have been analysed. Table 2 <ImgLink imgNo="2" imgType="table"/> shows the distribution of cases before and after 3:1 propensity score matching. </Pgraph><Pgraph>The results of detailed analysis per infection group are shown in Table 3 <ImgLink imgNo="3" imgType="table"/> and Table 4 <ImgLink imgNo="4" imgType="table"/>.</Pgraph><Pgraph>The analysis of real-world cases shows that in ABSSSI the presence of MRSA leads to excess costs of 5,145 € and a prolongation in LOS of 6.45 days, while in JBPI the excess costs of MRSA are even higher with 6,189 € and additional LOS of 10.59 days. Overall, the use of single-dose intravenous Dalbavancin and early discharge has the potential to create an average saving of 2,964 € as shown in Table 5 <ImgLink imgNo="5" imgType="table"/>.</Pgraph><Pgraph>The weighted LOS difference in ABSSSI and JBPI was <TextGroup><PlainText>6.8 days</PlainText></TextGroup>.</Pgraph><Pgraph>The peer review of MRSA infection cases in a major urban hospital was conducted to validate the results of the data analysis. Of 211 MRSA patients, 108 were carriers and had no infection. Of the remaining 103 cases, 47 patients had underlying conditions that would potentially make them suitable for single-dose intravenous Dalbavancin and subsequent discharge. Of these 47 cases, 32 percent could have been released. In average, LOS would have been 8.5 (varying from 4–18) days shorter. The savings calculated in this patient group were 2,281 €.</Pgraph></TextBlock>
<TextBlock linked="yes" name="Discussion">
<MainHeadline>Discussion</MainHeadline><Pgraph>The health economic analysis shows that cost savings can be achieved by administering single-dose intravenous Dalbavancin in patients with MRSA infections. The results are in line with other studies that have investigated the economic effects of Dalbavancin <TextLink reference="31"></TextLink>, <TextLink reference="32"></TextLink>, <TextLink reference="33"></TextLink>. Single-dose intravenous Dalbavancin shortens the LOS and thus results in cost savings. </Pgraph><Pgraph>MRSA incidence was <TextGroup><PlainText>10.8 p</PlainText></TextGroup>ercent for ABSSSI and <TextGroup><PlainText>11.3 p</PlainText></TextGroup>ercent for JBPI. The incidence of MRSA has remained steady in German hospitals. A slight decline from <TextGroup><PlainText>0.71 p</PlainText></TextGroup>ercent in 2013 to <TextGroup><PlainText>0.69 p</PlainText></TextGroup>ercent in 2016 was recorded for the overall MRSA rate in Germany according to <TextGroup><PlainText>Destatis</PlainText></TextGroup>. Nevertheless, 131,014 of 18,959,832 inpatients in Germany had MRSA as a pathogen coded <TextLink reference="34"></TextLink>. The Antibiotic Resistance Surveillance (ARS) at the Robert Koch Institute (RKI) determined an MRSA prevalence of 12.1 percent in 2015 and 10.6 percent in 2016 for blood cultures from inpatient care <TextLink reference="35"></TextLink>. Although national MRSA percentages vary widely between 1.2 percent and <TextGroup><PlainText>50.5 p</PlainText></TextGroup>ercent <TextLink reference="36"></TextLink>, MRSA isolation in ABSSSI can be as high as 25 percent in Europe <TextLink reference="37"></TextLink>. Our findings are in line with other sources.</Pgraph><Pgraph>Although outpatient parenteral antibiotic therapy (OPAT) has not yet been established in Germany, it provides a theoretical option for avoiding or reducing an inpatient stay. However, it cannot be considered appropriate for all patients as some of them may be unable to travel to receive their treatment <TextLink reference="38"></TextLink>, <TextLink reference="39"></TextLink>, <TextLink reference="40"></TextLink>. Likewise, the possibility of oralization is not suitable for all patients who are eligible for discharge. A key factor here is the patients’ compliance. Studies show that the compliance of patients depends on various factors and is often low <TextLink reference="41"></TextLink>, <TextLink reference="42"></TextLink>, <TextLink reference="43"></TextLink>. For example, Eells et al. state that patient adherence to oral antibiotic therapy for SSTI after hospital discharge was only 57 percent, which was associated with poor clinical outcomes <TextLink reference="43"></TextLink>. Thus, a single-dose intravenous Dalbavancin is an option for patients where the LOS can be significantly reduced.</Pgraph><Pgraph>Routine data was used to calculate savings estimates. These were derived from the cost difference of patients with or without MRSA infection. This is admittedly a crude estimate and may differ in clinical reality. The validation in a major urban hospital showed that 32% of the patients were eligible for discharge. This is less than the findings of Eckmann <TextGroup><PlainText>et al.</PlainText></TextGroup> <TextLink reference="17"></TextLink>, who reported a discharge opportunity rate of 47 percent in Germany and 37.9 percent in the entire study. However, the peer-review of the hospital cases carried out in the context of this paper revealed possible savings of 8.5 days, while Eckmann <TextGroup><PlainText>et al.</PlainText></TextGroup> found savings of only 6.2 bed days per case. This implies that findings will probably vary from hospital to hospital. </Pgraph><Pgraph>The achievable savings in the validation group of <TextGroup><PlainText>2,281 €</PlainText></TextGroup> were close to our calculation of 2,964 €. This can be an indicator that the estimates used were solid. However, for compliant patients that tolerate oral antibiotics the savings would be 5,244 € in average. That again is close to the measured cost differences in the two groups of ABSSSI and JBPI. The savings are calculated using the average cost difference. Therefore no 95% CI for the calculated effect is available. The challenge in calculating savings is to pick the right patients. The assumption to apply the possible average savings to 37.9% of all MRSA patients is currently investigated in a prospective evaluation of the use of Dalbavancin i.v. in a tertiary care hospital.</Pgraph><Pgraph>Moreover, extended LOS in hospital is known to be an independent risk factor for the increase of hospital acquired infections <TextLink reference="44"></TextLink>, <TextLink reference="45"></TextLink>, <TextLink reference="46"></TextLink>. Therefore, reducing LOS through early discharge has clinical and economical benefits.</Pgraph><Pgraph>Applying antibiotics with a half-life of 14 days or more can imply a risk for possible adverse effects. The available data on Dalbavancin show a good safety profile with nausea (2.4 %), diarrhoea (1.9 %), and headache (1.3 %) being the only common side effects according to SmPC and generally of mild or moderate severity <TextLink reference="47"></TextLink>. A meta-analysis by Dunne et al. showed less treatment-related adverse events and severe adverse events than comparators from phase 2/3 clinical trials with agents including vancomycin, linezolid, cefazolin, nafcillin, or oxacillin. The duration of adverse events proved to be not longer than with short-acting antibiotics (median 3.0 days Dalbavancin vs. 4.0 days comparators), nor did it take longer until the adverse events occurred (median 3.0 days Dalbavancin vs. 3.0 days comparators) <TextLink reference="48"></TextLink>.</Pgraph></TextBlock>
<TextBlock linked="yes" name="Conclusion">
<MainHeadline>Conclusion</MainHeadline><Pgraph>The LOS of patients with MRSA ABSSSI and JBPI infections is substantially higher than in patients with infections without MRSA in the respective DRGs and causes significant extra costs. Therefore, single-dose intravenous Dalbavancin may be an attractive option for dischargeable patients with MRSA infections who would otherwise be ineligible for OPAT or oralization due to factors such as lack of social support, frailty or substance misuse <TextLink reference="40"></TextLink>, <TextLink reference="49"></TextLink>, <TextLink reference="50"></TextLink>, <TextLink reference="51"></TextLink>, <TextLink reference="52"></TextLink>, <TextLink reference="53"></TextLink>. Patients with an expectedly long intravenous antibiotic therapy (6–10 days) and no other reason to stay in hospital could be selected.</Pgraph></TextBlock>
<TextBlock linked="yes" name="Notes">
<MainHeadline>Notes</MainHeadline><SubHeadline>Author contributions</SubHeadline><Pgraph>MW developed the general idea of the calculation and defined the entities in scope together with KFB. KW did the initial literature research, the statistical analysis and prepared the draft of the publication. BP undertook all queries at the German Federal Statistical Office. WH has compiled the model and all data for the calculations. TK did the additional literature research for the publication. KFB acted as clinical advisor and carried out the peer review together with MW.</Pgraph><SubHeadline>Competing interests</SubHeadline><Pgraph>The authors received an unrestricted research grant from Correvio GmbH. The sponsor had no influence on the design of the model, the DRG and case selection or the text of the publication. </Pgraph></TextBlock>
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<Caption><Pgraph><Mark1>Table 1: Overview of infection entities for analysis </Mark1></Pgraph></Caption>
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<Caption><Pgraph><Mark1>Table 2: Disease entities, number of cases with and without MRSA infections before and after matching </Mark1></Pgraph></Caption>
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<Caption><Pgraph><Mark1>Table 3: Descriptive statistics and outcomes in ABSSSI patients (matched sample)</Mark1></Pgraph></Caption>
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<Caption><Pgraph><Mark1>Table 4: Descriptive statistics and outcomes in JBPI patients (matched sample)</Mark1></Pgraph></Caption>
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<Caption><Pgraph><Mark1>Table 5: Summary of the savings calculation using the proportion of dischargeable patients as well as average cost difference between MRSA and non-MRSA infections adding Dalbavancin treatment costs</Mark1></Pgraph></Caption>
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