Antimicrobial practice – Adjustment of antibiotic treatment according to the results of blood cultures leads to decreased antibiotic use and costs

January 24, 2006 at 5:18 pm Leave a comment

Source: Journal of Antimicrobial Chemotherapy 2006 vol.57 N.2 p.326-330

Dag Berild1,*, Atefeh Mohseni1, Lien My Diep2, Mogens Jensenius1 and Signe Holta Ringertz3

1 Department of Internal Medicine, Aker University Hospital, N-0514 Oslo, Norway; 2 Research Centre, Aker University Hospital, N-0514 Oslo, Norway; 3 Department of Microbiology, Aker University Hospital, N-0514 Oslo, Norway

* Corresponding author. Tel: +47-22894808; Fax: +47-22894008; E-mail: dag.berild@medisin.uio.no

Introduction: To avoid the use of unnecessary broad-spectrum antibiotics, empirical therapy of bacteraemia should be adjusted according to the results of blood cultures.

Objectives: To investigate whether the results of blood cultures led to changes in antibiotic use and costs in a tertiary-care university hospital in Norway.

Methods: Medical records from all patients with positive blood cultures in 2001 were analysed retrospectively. Factors predisposing to infections, results of blood cultures, antibiotic use and outcome were recorded. The influence of blood culture results on antibiotic treatment and costs were analysed.

Results: The antibiotic use in 226 episodes of bacteraemia in 214 patients was analysed. According to the guidelines empirical antibiotic treatment should be adjusted in 166 episodes. Antibiotic use was adjusted in 146 (88%) of these 166 episodes, which led to a narrowing of therapy in 118 (80%) episodes. Compared with empirical therapy there was a 22% reduction in the number of antibiotics. Adjustment of therapy was more often performed in Gram-negative bacteraemia and polymicrobial cultures than in Gram-positive bacteraemia. In bacteraemia caused by ampicillin-resistant Escherichia coli, ampicillin was mostly replaced by ciprofloxacin. The cost for 7 days adjusted therapy in 146 episodes was 19 800 (23%) less than for 7 days of empirical therapy.

Conclusions: Adjustment of antibiotic therapy according to the results of blood cultures led to a reduction in the number of antibiotics and a narrowing of antibiotic therapy. The costs for antibiotics decreased.

 

Entry filed under: Antimicrobianos.

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