JAC Advance Access originally published online on March 29, 2007
Journal of Antimicrobial Chemotherapy 2007 59(5):977-989; doi:10.1093/jac/dkm033
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Cost-effectiveness of empirical prescribing of antimicrobials in community-acquired pneumonia in three countries in the presence of resistance
1 i3 Innovus, Beaufort House, Cricket Field Road, Uxbridge UB8 1QG, UK 2 Summa Health System, 525 E. Market Street, Akron, OH, USA 3 Hospital Mutua de Terrassa, Pl. Dr. Robert 5, 08221 Terrassa, Barcelona, Spain 4 Bayer Healthcare, Friedrich-Ebert-Strasse 217, 42117 Wuppertal, Germany
Received 10 July 2006; returned 15 August 2006; revised 17 January 2007; accepted 20 January 2007
* Corresponding author. Tel: + 44-1895-455380; Fax: +44-1895-520039; E-mail: mmartin{at}innovus.com
Objectives: To assess the cost-effectiveness of empirical outpatient treatment options for community-acquired pneumonia (CAP) in France, the USA and Germany, representing high, moderate and low antimicrobial resistance prevalence, respectively.
Methods: A decision analytic model was developed for mild-to-moderate CAP outpatient treatment. Treatment algorithms incorporated follow-up after treatment failure due to resistance or other reasons. First-line treatment included moxifloxacin, ß-lactams, macrolides or doxycycline; second-line treatment used a different antimicrobial class. Country-specific resistance and co-resistance prevalences to first- and second-line therapy for the major CAP pathogens were derived from surveillance studies. Clinical failure rates due to antimicrobial-susceptible and -resistant pathogens were obtained from the literature or estimated. Total costs were estimated using standard sources and a third-party payer perspective. Outcome measures included first-line clinical failures avoided, second-line treatments avoided and hospitalizations avoided. Incremental cost-effectiveness ratios (ICERs) were calculated.
Results: First-line moxifloxacin treatment followed by co-amoxiclav dominated all other treatments in France, the USA and in Germany for all outcome measures. Sensitivity analyses maintained moxifloxacin dominance in France and the USA but affected ICERs in some cases in Germany.
Conclusions: Antimicrobial resistance/spectrum have a significant impact on outcomes and costs in empirical outpatient CAP treatment. Despite low acquisition costs for generic antibiotics, first-line treatment effective against the major CAP pathogens, including strains resistant to other antimicrobials, resulted in better clinical outcomes in all countries and lower treatment costs for all.
Keywords: antimicrobial resistance , moxifloxacin , decision analytic model , cost-effectiveness analysis