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The implementation of antimicrobial stewardship programs (ASPs) is a promising strategy to help address the problem of antimicrobial resistance. We sought to determine the efficacy of ASPs and their effect on clinical and economic parameters. We searched PubMed, EMBASE, and Google Scholar looking for studies on the efficacy of ASPs in hospitals. Based on 26 studies (extracted from 24,917 citations) with pre- and postimplementation periods from 6 months to 3 years, the pooled percentage change of total antimicrobial consumption after the implementation of ASPs was −19.1% (95% confidence interval [CI] = −30.1 to −7.5), and the use of restricted antimicrobial agents decreased by −26.6% (95% CI = −52.3 to −0.8). Interestingly, in intensive care units, the decrease in antimicrobial consumption was −39.5% (95% CI = −72.5 to −6.4). The use of broad-spectrum antibiotics (−18.5% [95% CI = −32 to −5.0] for carbapenems and −14.7% [95% CI = −27.7 to −1.7] for glycopeptides), the overall antimicrobial cost (−33.9% [95% CI = −42.0 to −25.9]), and the hospital length of stay (−8.9% [95% CI = −12.8 to −5]) decreased. Among hospital pathogens, the implementation of ASPs was associated with a decrease in infections due to methicillin-resistantStaphylococcus aureus (risk difference [RD] = −0.017 [95% CI = −0.029 to −0.005]), imipenem-resistantPseudomonas aeruginosa (RD = −0.079 [95% CI = −0.114 to −0.040]), and extended-spectrum beta-lactamaseKlebsiella spp. (RD = −0.104 [95% CI = −0.153 to −0.055]). Notably, these improvements were not associated with adverse outcomes, since the all-cause, infection-related 30-day mortality and infection rates were not significantly different after implementation of an ASP (RD = −0.001 [95% CI = −0.009 to 0.006], RD = −0.005 [95% CI = −0.016 to 0.007], and RD = −0.045% [95% CI = −0.241 to 0.150], respectively). Hospital ASPs result in significant decreases in antimicrobial consumption and cost, and the benefit is higher in the critical care setting. Infections due to specific antimicrobial-resistant pathogens and the overall hospital length of stay are improved as well. Future studies should focus on the sustainability of these outcomes and evaluate potential beneficial long-term effects of ASPs in mortality and infection rates.

Systematic Review and Meta-analysis of Clinical and Economic Outcomes from the Implementation of Hospital-Based Antimicrobial Stewardship Programs