Multiresistant bacteria and current therapy - the economical side of the story
European Journal of Medical Research volume 15, Article number: 571 (2010)
Severe infections with multiresistant bacteria (MRB) are a medical challenge and a financial burden for hospitals. The adequate antibiotic therapy is a key issue in multiresistant bacteria management. Several major cost drivers have been identified. Remarkably drug acquisition costs are not necessarily included. Most significant are the length of stay in hospital, the hours of mechanical ventilation and the time treated on an intensive care unit.
In a systematic review of the literature the following aspects were investigated:
- Do generic treatment strategies contribute in cost savings?
- Are there specific results for recent antibiotics?
Early adequate and effective antimicrobial treatment, switch from i.v. to oral therapy, adjusted duration of therapy and adherence to guidelines have been found to be successful strategies.
Looking at specific antibiotics, the best evidence for cost-effectiveness is found for Linezolid in treatment of cSSTI as well as in HAP. Daptomycin shows good economic results in bloodstream infections, so possibly being a cost-effective alternative to vancomycin. Looking at tigecycline the published data show neither higher costs nor savings compared to imipeneme. Doripenem as one of the newest therapy options has proven to be highly cost-saving in HAP when compared with imipenem. However, most analyses are based on pharmacoeconomic modelling rather than on directly analysing trial data or real life clinical populations.
Using modern antibiotics in whole is not more expensive than using established therapies. Modern antibiotics are cost-effective and sometimes even cost-saving. This is especially true if an effective therapy is initiated as early as possible.
Severe MRB cause a serious burden of disease in most countries worldwide [1, 2, 6, 23]. Their therapeutic management is a major cost driver in healthcare, particularly in hospitals. Looking at the economical impact of antibiotic therapy of severe MRB infections, several factors were identified as the major cost drivers [3–5]:
prolonged hospital length of stay (LOS)
hours of mechanical ventilation (HMV)
duration of treatment on an intensive care unit (ICU)
cost of patient isolation (isolation)
complications, such as renal failure or infection transmission
Whether any given antibiotic therapy is an economically adequate option therefore depends on its effect on one or more of these cost drivers. Interestingly, the actual daily costs of the drug itself does not significantly affect the overall costs of treatment. Still in many settings, the choice of therapy is controlled by drug acquisition costs, as these data are easily available [7, 8].
This article provides a review of the current literature on the role of recent antibiotic agents in the treatment of MRB infections from the economical perspective.
Materials and methods
We conducted a literature review to investigate the available evidence on cost-effectiveness of antibiotic treatment strategies in the management of MRB infections. Looking at the economical impact of antibiotic therapy in general, there are the following factors that have been proven to influence positively the above-mentioned cost drivers:
With respect to these known factors affecting major cost drivers, we conducted a literature review focussed on articles dealing with recently introduced antibiotics active against MRB in the context of cost issues or cost-impacting factors.
We used the agent AND 'cost-effectiveness' OR 'economical' as search terms.
We had 178 search findings in total. Figure 1 shows the search findings.
The number of publications referring explicitely to cost-effectiveness or economical analyses on linezolid is the highest. For closer analysis we then picked 25 articles that focussed on one or more of our above mentioned cost drivers.
In general economical analyses for drugs often differ from clinical trials. The most common method is modelling economical effects by using results from clinical trials. Only rarely economical data are directly collected in the course of clinical trials. Nearly no data exist on economical analyses based on clinical routine treatment.
Figure 2 shows the results of the 25 articles closely reviewed.
In the following section we describe major findings for the agents in focus.
Multiple economic analyses for linezolid have been published over the last decade. There are publications for both major indications (cSSTI, HAP) and for several countries (USA, Germany, Spain, France). Thus the economics of linezolid use effects appear to be well investigated. Studies are either cost-effectiveness analyses based on data of clinical trials or pharmacoeconomic models [26–30]. The cost savings associated with the use of linezolid are predominantly due to a significant reduction of LOS. Among recent antibiotics used for MRB infection, linezolid is the only drug that is available intravenous (IV) and orally (with a similar dose/exposure ratio), and the IV-to-oral switch allows earlier hospital discharge. The net effect is most significant in the treatment of cSSTI (2.0 - 2.3 LOS days saved), as the overall severity of illness is lower than in pneumonia, and hospital-acquired pneumonia in particular. However, linezolid has been shown to be cost-effective in pneumonia as well. This is most likely due to earlier recovery and earlier hospital discharge. Most authors today acknowledge linezolid as a cost-effective component of the therapeutic armamentarium, particularly in MRSA infections . However, this insight has not been entirely implemented in clinical practice yet .
There are no explicit analyses available for other cost drivers. Most recently, a meta-analysis  suggested that there is no specific economic rationale supporting the use of vancomycin versus linezolid for empiric therapy in settings with low MRSA prevalence.
Introduced more recently than linezolid, daptomycin already prompted a substantial number of publications on economic issues and publications referring to significant cost drivers [34–40]. The most relevant indication for daptomycin is bloodstream infection with gram-positive cocci, as the overall number of patients is significantly higher than in endocarditis. Similar to most of the other drugs discussed here, daptomycin is also suitable for the treatment of cSSTI. The main economic impact of daptomycin is associated with a reduction of LOS. However, earlier transfer from ICU to general ward is also described. Some publications [35, 37–39] attribute lower costs to earlier cure and higher cure rates achieved with daptomycin versus vancomycin, which may relate to the bactericidal effect of the drug. However the trials underlying these analyses were no RCTs.
Daptomycin has been shown to be associated with less occurrence of renal failure than vancomycin . It thus may be speculated that the lipopeptide antibiotic has a potential to influence positively the cost-driving duration of therapy as mentioned in one publication (39). However, this aspect still awaits further investigation.
Convincing economic analyses and articles referring to cost drivers in clinical studies have been published for doripenem, a recently approved carbapenem antibiotic [41–45]. Doripenem was shown to be associated with less resource use regarding LOS, HMV, and less complications (PsA resistance, PsA transmissions) compared to imipenem. No significant reduction in ICU days has been described so far. Remarkably, economical evaluation of this drug was included in the data and analysis of clinical trials.
Among the articles retrieved on tigecycline [46–51], there were two dedicated analyses that dealt with resource utilization (i.e. cost) associated with the use of this recently introduced glycylcyclin antibiotic . Tigecycline is an interesting treatment option particularly in complicated intraabdominal infections. With its very broad spectrum of activity, tigecycline can be used empirically in suspected polymicrobial infections. Despite the slightly higher drug acquisition costs compared to imipenem it has been showed that first-line therapy is not more expensive than using tigecycline in second-line therapy . It also has the potential to be used as a monotherapy in this indication  and therefore would affect overall costs by abolishing the need for another drug. Two publications explicitly report that LOS was not negatively affected when comparing tigecycline with imipenem [49, 50].
Table 1 summarizes the data indicating a positive influence of the drugs covered in this review on cost drivers and influencing factors.
It appears that the number of publications that evaluate the economic impact of new antimicrobial agents such as linezolid, daptomycin, tigecycline and doripenem is increasing. For every substance there are results or at least trends that indicate favourable effects on economic outcomes. The studies uniformly show that despite higher drug acquisition costs for newer antibiotics, overall treatment costs can be lower or therapy is cost-effective due to other factors (i.e. survival for linezolid in pneumonia). Only a limited number of studies analyzed 'real-life' clinical populations [11–13, 24, 27, 28, 37, 39], whereas the greater part of the publications used pharmacoeconomic models based on data from clinical trials. While this is a well-accepted approach, it does not prove the relevance of the respective findings in the clinical routine setting. Obviously, it is a most challenging task to validate data from pharmacoeconomic models in "real life", as the variance of patient characteristics is much higher than in trial population and various confounders complicate such analyses. There are some ongoing studies trying to relate DRG outcomes - i.e. the net effect on hospital reimbursement - to the chosen therapy strategies. It will be interesting to see the results in the near future.
The economic impact of antibiotic treatment choices in complicated infections with multiresistant bacteria is an increasingly important issue, as numerous publications document the enormous extra healthcare cost of these infections (1, 3, 4, 9, 10, 13, 36, 41). The analysis of the current literature shows that therapy with modern antibiotics is generally cost-effective and may even be associated with net savings although drug acquisition costs are higher in conventional therapy regimens. Currently, favourable cost effects are best documented for linezolid. A number of pharmacoeconomic analyses are also available for daptomycin, tigecyclin and doripenem, and more will certainly follow. Investigators may increasingly use economic data to document favourable cost effects of state-of-the-art therapy, thus overcoming the still wide-spread focus on 'price-tags'. However only a few analyses use 'reallife' clinical settings for cost analyses. Modelling is the most common and most accepted approach to gain 'economical evidence'. With directly connecting economical analyses to clinical trials and/or to routine data collections the results would reach a higher level of acceptance among hospital administrators.
Clinicians, pharmacists and economists in the hospital should work together to realize cost-savings with effective antibiotic therapy rather than sticking to treatment choices driven by drug acquisition cost.
Average length of stay in a given DRG, basis for determining whether a patient causes more costs than reimbursement
community acquired pneumonia
complicated skin and soft tissue infections
diagnoses related groups, systems to classify patients based on their resource consumptions
hospital acquired pneumonia
hours of mechanical ventilation
treatment days on an intensive care unit
length of stay in hospital
infection with Multiresistant bacteria.
Köck R, et al.: Methicillin-resistant Staphylococcus aureus (MRSA): burden of disease and control challenges in Europe. Euro Surveill 2010,15(41):19688.
Schweickert B, et al.: The MRSA-Import in ICUs is an important predictor for the occurrence of nosocomial MRSA-cases. Clin Microbiol Infect 2010, in press. doi: 10.1111/j.1469–0691.2010.03409.x.
Resch A, Wilke M, Fink C: The cost of resistance: incremental cost of methicillin-resistant Staphylococcus aureus (MRSA) in German hospitals. Eur J Health Econ 2009,10(1):287–97.
Wernitz MH, Lenz C, Veit SK: Die Bedeutung von Infektionen durch multiresistente Staphylococcus aureus für das deutsche Gesundheitswesen - The (n)ever ending story? J Pharmakol Ther 2009, 18: 75–82.
Ott E, et al.: Costs of nosocomial pneumonia caused by meticillin-resistant Staphylococcus aureus. J Hosp Infect 2010, in press.
Filice GA: Excess costs and utilization associated with methicillin resistance for patients with Staphylococcus aureus infection. Infect Control Hosp Epidemiol 2010,31(4):365–73. 10.1086/651094
Dietrich ES, Berthold H, Jopp R, Schreier U, Gilge R, Bartmann P: Kosten einer leitli-niengerechten Arzneimitteltherapie in Deutschland. Gesundh ökon Qual manag 2005, 10: 35–43. 10.1055/s-2004-813943
Dietrich ES, Schmid M, Bucher A, Lemmen S, Frank U, Daschner FD: Kostenreduktion in der Antibiotika-Therapie. Krankenhauspharmazie 1998,19(6):287–92.
Slama TG: Gram-negative antibiotic resistance: there is a price to pay. Crit Care 2008,12(Suppl 4):S4. Epub 2008 May 21 10.1186/cc6820
Eandi M: Hospital management of complicated intra-abdominal infections: pharmacoeconomic evaluation. J Chemother 2009,21(Suppl 1):44–55.
Kumar A, et al.: Duration of hypotension before initiation of effective antimicrobial therapy is the critical determinant of survival in human septic shock. Crit Care Med 2006,34(6):1589–96. 10.1097/01.CCM.0000217961.75225.E9
Vallés J, Rello J, Ochagavía A, Garnacho J, Alcalá MA: Community-acquired bloodstream infection in critically ill adult patients: impact of shock and inappropriate antibiotic therapy on survival. Chest 2003,123(5):1615–24. 10.1378/chest.123.5.1615
Rello J: Determinants of Choice and Prescription Patterns in Empiric Antibiotic Therapy for HAP/VAP. Eur Respir J 2010, in press.
Ballock RT, Newton PO, Evans SJ, Estabrook M, Farnsworth CL, Bradley JS: A comparison of early versus late conversion from intravenous to oral therapy in the treatment of septic arthritis. J Pediatr Orthop 2009,29(6):636–42. 10.1097/BPO.0b013e3181b2b860
Eachempati SR, Hydo LJ, Shou J, Barie PS: Does de-escalation of antibiotic therapy for ventilator-associated pneumonia affect the likelihood of recurrent pneumonia or mortality in critically ill surgical patients? J Trauma 2009,66(5):1343–8. 10.1097/TA.0b013e31819dca4e
Mertz D, Koller M, Haller P, Lampert ML, Plagge H, Hug B, Koch G, Battegay M, Flückiger U, Bassetti S: Outcomes of early switching from intravenous to oral antibiotics on medical wards. J Antimicrob Chemother 2009,64(1):188–99. 10.1093/jac/dkp131
Rhew DC, Tu GS, Ofman J, Henning JM, Richards MS, Weingarten SR: Early switch and early discharge strategies in patients with community-acquired pneumonia: a metaanalysis. Arch Intern Med 2001,161(5):722–7. 10.1001/archinte.161.5.722
Brady PW, Conway PH, Goudie A: Length of intravenous antibiotic therapy and treatment failure in infants with urinary tract infections. Pediatrics 2010,126(2):196–203. Epub 2010 Jul 12 10.1542/peds.2009-2948
Schuetz P, et al.: Effect of procalcitonin-based guidelines vs standard guidelines on antibiotic use in lower respiratory tract infections: the ProHOSP randomized controlled trial. JAMA 2009,302(10):1059–66. 10.1001/jama.2009.1297
Hochreiter M, et al.: Procalcitonin to guide duration of antibiotic therapy in intensive care patients: a randomized prospective controlled trial. Crit Care 2009,13(3):R83. Epub 2009 Jun 3 10.1186/cc7903
Chastre J, et al.: Comparison of 8 vs 15 days of antibiotic therapy for ventilator-associated pneumonia in adults: a randomized trial. JAMA 2003,290(19):2588–98. 10.1001/jama.290.19.2588
Micek ST, et al.: Optimizing antibiotic treatment for ventilator-associated pneumonia. Pharmacotherapy 2006,26(2):204–13. 10.1592/phco.26.2.204
Van Zanten ARH, Engelfriet PM, van Dillen K, van Veen M, Nuijten MJC, Poldermann KH: Importance of nondrug costs of intravenous antibiotic therapy. Critical Care 2003, 7: 420–21. Cousins D: Improving safe medication practice. NHS National Patient Safety Agency. www.npsa.nhs.uk 10.1186/cc2403
Menendez R, Reyes S, Martinez R, de la CP, Manuel VJ, Vallterra J: Economic evaluation of adherence to treatment guidelines in nonintensive care pneumonia. Eur Respir J 2007,29(4):751–6. 10.1183/09031936.00052506
Shorr AF, et al.: Impact of antibiotic guideline compliance on duration of mechanical ventilation in critically ill patients with community-acquired pneumonia. Chest 2006,130(1):93–100. 10.1378/chest.130.1.93
Shorr AF, Susla GM, Kollef MH: Linezolid for treatment of ventilator-associated pneumonia: a cost-effective alternative to Vancomycin. Crit Care Med 2004,32(1):137–43. 10.1097/01.CCM.0000104110.74657.25
Mullins CD, Hsu VD, Shorr A, et al.: Linezolid versus Vancomycin health and economic outcomes: a retrospective database study of 11,018 infection-related hospitalization treatment episodes. ECCMID 2009. Poster P-778
McCollum M, Rhew DC, Parodi S: Cost analysis of switching from i.v. vancomycin to p.o. linezolid for the management of methicillin-resistant Staphylococcus species. Clin Ther 2003,25(12):3173–89. 10.1016/S0149-2918(03)90101-9
Schürmann D, Sorensen SV, De Cock E, Duttagupta S, Resch A: Cost-effectiveness of linezolid versus vancomycin for hospitalised patients with complicated skin and soft-tissue infections in Germany. Eur J Health Econ 2009,10(1):65–79. 10.1007/s10198-008-0104-7
Grau S, Rubio-Terrés C: Pharmacoeconomics of linezolid, Expert Opin Pharmacother. 2008,9(6):987–1000.
Walkey AJ, O'Donnell MR, Wiener RS: Linezolid versus Glycopeptide Antibiotics for the Treatment of Suspected Methicillin-Resistant Staphylococcus Aureus Nosocomial Pneumonia: A Meta-Analysis of Randomized Controlled Trials. Chest 2010, in press.
Shorr AF: Epidemiology and economic impact of meticillin-resistant Staphylococcus aureus: review and analysis of the literature. Pharmacoeconomics 2007,25(9):751–68. 10.2165/00019053-200725090-00004
Boldt J, Papsdorf M: Expensive modern therapy options in intensive care medicine in Germany-- are they being used? Results of a questionnaire. Dtsch Med Wochenschr 2005,130(3):87–91. 10.1055/s-2005-837379
Fowler V, et al.: Daptomycin versus standard therapy for bacteremia and endocarditis caused by Staphylococcus aureus. N Engl J Med 2006,355(7):653–65. 10.1056/NEJMoa053783
Seaton RA: Daptomycin: rationale and role in the management of skin and soft tissue infections. J Antimicrob Chemother 2008,62(Suppl 3):iii15–23.
Lodise TP Jr, McKinnon PS: Burden of methicillin-resistant Staphylococcus aureus: focus on clinical and economic outcomes. Pharmacotherapy 2007,27(7):1001–12. 10.1592/phco.27.7.1001
Krige JE: Effectiveness and duration of daptomycin therapy in resolving clinical symptoms in the treatment of complicated skin and skin structure infections. Curr Med Res Opin 2007,23(9):2147–56. 10.1185/030079907X219652
Davies SL: Daptomycin versus vancomycin for complicated skin and skin structure infections: clinical and economic outcomes. Pharmacotherapy 2007,27(12):1611–8. 10.1592/phco.27.12.1611
Fossaceca C: Outcomes analysis of daptomycin use in a community hospital. Adv Ther 2007,24(3):517–28. 10.1007/BF02848774
Bhavnani SM, et al.: Cost-Effectiveness of daptomycin versus vancomycin and gentamicin for patients with methicillin-resistant Staphylococcus aureus bacteremia and/or endocarditis. Clin Infect Dis 2009,49(5):691–8. 10.1086/604710
Amin A: Clinical and economic consequences of ventilator-associated pneumonia. Clin Infect Dis 2009,49(Suppl 1):S36–43.
Merchant S, et al.: Hospital resource utilization with doripenem versus imipenem in the treatment of ventilator-associated pneumonia. Clin Ther 2008,30(4):717–33. 10.1016/j.clinthera.2008.04.001
Chastre J, et al.: Efficacy and safety of intravenous infusion of doripenem versus imipenem in ventilator-associated pneumonia: a multicenter, randomized study. Crit Care Med 2008,36(4):1089–96. 10.1097/CCM.0b013e3181691b99
Matthews SJ, Lancaster JW: Doripenem monohydrate, a broad-spectrum carbapenem antibiotic. Clin Ther 2009,31(1):42–63. 10.1016/j.clinthera.2009.01.013
Kollef MH, Nathwani D, Merchant S, Gast C, Quintana A, Ketter N: Medical resource utilization among patients with ventilator-associated pneumonia: pooled analysis of randomized studies of doripenem versus comparators. Crit Care 2010,14(3):R84. Epub 2010 May 10. 10.1186/cc9012
Doan TL, et al.: Tigecycline: a glycylcycline antimicrobial agent. Clin Ther 2006,28(8):1079–106. 10.1016/j.clinthera.2006.08.011
Nicolau DP: Management of complicated infections in the era of antimicrobial resistance: the role of tigecycline. Expert Opin Pharmacother 2009,10(7):1213–22. 10.1517/14656560902900853
Reygaert WC: Antibiotic optimization in the difficult-to-treat patient with complicated intra-abdominal or complicated skin and skin structure infections: focus on tigecycline. Ther Clin Risk Manag 2010, 6: 419–30.
Mallick R, Sun S, Schell SR: Predictors of efficacy and health resource utilization in treatment of complicated intra-abdominal infections: evidence for pooled clinical studies comparing tigecycline with imipenem-cilastatin. Surg Infect (Larchmt) 2007,8(2):159–72. 10.1089/sur.2005.058
Bergallo C, et al.: Safety and efficacy of intravenous tigecycline in treatment of community-acquired pneumonia: results from a double-blind randomized phase 3 comparison study with levofloxacin. Diagn Microbiol Infect Dis 2009,63(1):52–61. 10.1016/j.diagmicrobio.2008.09.001
Ancona F: Economic impact simulation analysis of use of tigecycline, as appropriate, in first-course antibiotic therapy for complicated intra-abdominal infections in intensive care patients. Minerva Med 2010,101(5):319–8.
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Wilke, M. Multiresistant bacteria and current therapy - the economical side of the story. Eur J Med Res 15, 571 (2010). https://doi.org/10.1186/2047-783X-15-12-571
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