The effect of limiting antimicrobial therapy duration on antimicrobial resistance in the critical care setting

Area of Science:

• Infectious Diseases
• Critical Care Medicine
• Pharmacology

Background:

• Prolonged antimicrobial agent use is a known driver of antimicrobial resistance.
• Optimizing antimicrobial therapy is crucial in intensive care settings to combat resistance.

Purpose of the Study:

• To evaluate the impact of a 14-day limit on antimicrobial therapy duration in a medical-surgical intensive care unit (ICU).
• To assess changes in antimicrobial utilization and bacterial resistance rates following the intervention.

Main Methods:

• A quasiexperimental, before-and-after study design was employed.
• An intervention was implemented to optimize antimicrobial therapy duration, limiting it to 14 days.
• Antimicrobial utilization (defined daily dose per 1000 patient-days) and resistance rates were compared pre- and post-intervention.

Main Results:

• The intervention successfully led to the discontinuation of antimicrobial therapy before 14 days in 89.8% of cases.
• Significant reductions were observed in the use of carbapenems (24.5%), vancomycin (14.3%), and cephalosporins (12.2%).
• Imipenem resistance markedly decreased in Acinetobacter baumannii (88.5% to 20.0%) and Klebsiella pneumoniae (54.5% to 10.7%).

Conclusions:

• Reducing antimicrobial therapy duration to 14 days promotes more rational antimicrobial use in critical care.
• This intervention strategy effectively contributes to lowering bacterial resistance rates in the ICU setting.