An institutional review of antimicrobial stewardship interventions

Correlation between antibiotic use and resistance of gram-negative bacteria at a university hospital in Japan from 2013 to 2021: a study using the Japan Surveillance for Infection Prevention and Healthcare Epidemiology system

OBJECTIVES

The Japan Surveillance for Infection Prevention and Healthcare Epidemiology (J-SIPHE) system aggregates information related to antimicrobial resistance (AMR) measures. We aimed to investigate the correlation between antibiotic use and AMR at a university hospital from 2013 to 2021 in a time series analysis using the J-SIPHE system. We also studied this correlation in each ward (inter-ward analysis).

METHODS

Data on antibiotic use and resistance rates were collected from the J-SIPHE system, except for the resistance rate in each ward, which was calculated from the source data prepared for this system.

RESULTS

Piperacillin/tazobactam use was positively correlated with piperacillin/tazobactam resistance in Escherichia coli and Klebsiella pneumoniae in the inter-ward analysis, and in Pseudomonas aeruginosa in both analyses. Carbapenem use was positively correlated with meropenem resistance in Enterobacter cloacae in the time series analysis and in P. aeruginosa in both analyses, and imipenem/cilastatin resistance in P. aeruginosa in inter-ward analysis. Quinolone use was positively correlated with levofloxacin resistance in E. coli in both analyses, and in K. pneumoniae in inter-ward analysis.

CONCLUSIONS

This is the first study to investigate the correlation between antibiotic use and AMR at a single hospital in time series and inter-ward analyses using the J-SIPHE system and data prepared for this system, suggesting that this system may be useful for promoting AMR measures.

Correlation between antibiotic use and antibiotic resistance: A multicenter study using the Japan Surveillance for Infection Prevention and Healthcare Epidemiology (J-SIPHE) system in Hokkaido, Japan

BACKGROUND

The Japan Surveillance for Infection Prevention and Healthcare Epidemiology (J-SIPHE) system aggregates information related to antimicrobial resistance (AMR) measures in participating medical institutions nationwide and is intended to be used for promotion of AMR measures in participating facilities and their communities. This multicenter study aimed to determine the usefulness of the J-SIPHE system for evaluating the correlation between antibiotic use and antibiotic resistance in Hokkaido, Japan.

METHODS

Data on antibiotic use and detection rate of major resistant Gram-negative bacteria at 19 hospitals in 2020 were collected from the J-SIPHE system, and data correlations were analyzed using JMP Pro.

RESULTS

The detection rate of carbapenem-resistant Pseudomonas aeruginosa was significantly positively correlated with carbapenem use (Spearman's ρ = 0.551; P = .015). There were significant positive correlations between the detection rate of fluoroquinolone-resistant Escherichia coli and the use of piperacillin/tazobactam, carbapenems, and quinolones [ρ = 0.518 (P = .023), ρ = 0.76 (P < .001), and ρ = 0.502 (P = .029), respectively].

CONCLUSIONS

This is the first multicenter study to investigate the correlation between antibiotic use and antibiotic resistance using the J-SIPHE system. The results suggest that using this system may be beneficial for promoting AMR measures.

Clinical outcomes of intervention for carbapenems and anti-methicillin-resistant Staphylococcus aureus antibiotics by an antimicrobial stewardship team

BACKGROUND

There are no reports on the effects of interventions, such as discontinuation and change and/or de-escalation of carbapenems and anti-methicillin-resistant Staphylococcus aureus (MRSA) antibiotics by an antimicrobial stewardship team focusing on detailed patient outcomes. This study aimed to evaluate these effects.

METHODS

This retrospective cohort study was conducted at a tertiary care hospital from December 2018 to November 2019.

RESULTS

Favorable clinical responses were obtained in 165 of 184 cases (89.7%) in the intervention-accepted group, higher than those in the not accepted group (14/19 cases, 73.7%; P = .056). All-cause 30 day mortality was lower in the accepted group than in the not accepted group (1.1% and 10.5%, respectively; P = .045). The microbiological outcomes were similar between the two groups. Duration of carbapenem and anti-MRSA antibiotic use in the accepted group was significantly lower than that in the not accepted group (median [interquartile range]: 8 days [5-13] versus 14 days [8-15], respectively, P = .026 for carbapenem; 10 days [5.3-15] vs 15.5 days [13.8-45.3], respectively, P = .014 for anti-MRSA antibiotic).

CONCLUSIONS

This is the first study to investigate the effects of interventions such as discontinuation and change and/ or de-escalation of antibiotics on detailed outcomes. Our intervention could reduce the duration of carbapenem and anti-MRSA antibiotic use without worsening clinical and microbiological outcomes.

[Organisational and staff requirements for antimicrobial stewardship activities in hospitals : Position paper of the Commission on Anti-Infectives, Resistance and Therapy (Commission ART) at the Robert Koch Institute, with advice from professional associations]

Increased awareness of the rising antimicrobial resistance problem and impending loss of suitable treatment options for infectious diseases have changed patient care. Antimicrobial/antibiotic stewardship (ABS) activities aiming to optimize antimicrobial treatment were specified in international (WHO, ECDC) and national programmes and evidence-based practice guidelines. In Germany, ABS in hospitals is enshrined in the Infection Protection Act §23 and in a national guideline. The position paper presents the goals and tasks of ABS as well as the necessary organisational and staff requirements.Qualified training and education, mandates and support from hospital directors, and the provision of sufficient resources are essential prerequisites for the successful work of the ABS team. The ABS team should work hospital-wide across clinical services. Their main tasks are developing and implementing an ABS programme tailored to local needs and the conditions of the hospital, taking into account anti-infective drug prescribing, the resistance situation and case mix. Their tasks also include drafting and implementing in-house recommendations for diagnosis, prophylaxis and treatment of important infectious diseases. The ABS team should be interdisciplinary and include specially qualified doctors and pharmacists. Doctors commissioned for ABS should support this team and take the department-specific concerns into account. The document specifies a minimum ABS staff of one full-time equivalent (FTE) per 500 beds. Depending on the case mix and specialties, additional staff may be required. It proposes that there should be 0.1 FTE doctors commissioned for ABS per 100 beds.

[The Role of Pharmacists in Antimicrobial Stewardship]

Antimicrobial resistance (AMR) has been declared a global public health emergency, necessitating the involvement of the whole of society to address this increasingly serious threat. AMR causes prolonged illness, greater risk of infection spread, increased morbidity, and higher mortality rates, which result in increased expenses to the government, healthcare services, and individuals. Inappropriate use of antimicrobials has been indicated as the primary cause for the global expansion of AMR. Under these circumstances, various countries have formulated suitable national action plans to curb AMR. In Japan, the national action plan on AMR was announced in April 2016. Our previous study clarified that orally administered antimicrobials accounted for approximately 90% of total consumption: oral third-generation cephalosporins, macrolides, and fluoroquinolones accounted for approximately 77% of oral consumption. Therefore pharmacists must extend their support for the appropriate use of antimicrobials prescribed by attending physicians to not only hospitalized patients but also outpatients. "Choosing wisely," a US-based health education campaign, warns against unnecessary use of antimicrobials. Pharmacists should strive to disseminate the concept of "choosing wisely" in relation to other medicines, implement further interventions, and evaluate them. In this article, we present data on use of antimicrobials in Japan, and mention how pharmacists should be involved in enabling physicians choose antimicrobials wisely.

Anti-infective Acquisition Costs for a Stewardship Program: Getting to the Bottom Line

Background

Though antimicrobial stewardship programs (ASPs) are in place for patient safety, financial justification is often required. In 2016, the Infectious Diseases Society of America (IDSA) recommended that anti-infective costs be measured by patient-level administration data normalized for patient census. Few publications use this methodology. Here, we aim to compare 3 methods of drug cost analysis during 3 phases of an ASP as an example of this recommendation's implementation.

Methods

At a freestanding pediatric hospital, we retrospectively assessed anti-infective cost using pharmacy purchasing data, patient-level administration data from the electronic medical record (EMR), and patient-level administration data from the Pediatric Hospital Information Systems (PHIS) database, all normalized to patient census. Costs pre-ASP, while planning the ASP, and post-ASP were then compared for each method.

Results

Significant differences in costs between the methods were observed. Pharmacy purchasing endorsed minimal financial benefit (decrease planning to post-ASP of $590 dollars per 1000 patient-days), while the EMR and PHIS data endorsed a decrease of $12785 and $21380 per 1000 patient-days, respectively, for a total yearly cost savings of $54656 for pharmacy purchasing data, $1184336 for EMR data, and $2117522 for PHIS data.

Conclusions

Pharmacy purchasing data underestimated cost savings compared with EMR and PHIS data, while EMR and PHIS data were comparable in magnitude of savings. At Children's Hospital Colorado, savings justified the full cost of the ASP. EMR patient-level administration data, normalized to patient census, offers a readily available and standardized measure of anti-infective costs over time.

Pharmacokinetics-pharmacodynamics, computer decision support technologies, and antimicrobial stewardship: the compass and rudder

The first guidelines for conducting antimicrobial stewardship in the hospitalized setting were published in 2007. These guidelines recommend that stewardship programs employ the science of pharmacokinetics-pharmacodynamics (PK-PD) as well as adopting computerized decision support technologies when possible. The United States Food and Drug Administration have adopted PK-PD as a cornerstone in the evaluation of antimicrobial agents during clinical development. The core principles of PK-PD center around describing the relationship between drug exposure indexed to the susceptibility of the infecting bacterial pathogen and patient response. Using such relationships with population pharmacokinetic models and simulation, rational drug and dosing regimens can be selected. But because PK-PD modeling and simulation programs are generally absent in clinical practice, systematic application of this science is missing. Herein we explain advances in technology that allow clinicians to apply PK-PD to optimize the agents and dosing regimens selected for the treatment of hospitalized patients with infection.

Linking the Effect of Antibiotics on Partial-Nitritation Biofilters: Performance, Microbial Communities and Microbial Activities

The emergence and spread of antibiotics resistance in wastewater treatment systems have been pointed as a major environmental health problem. Nevertheless, research about adaptation and antibiotics resistance gain in wastewater treatment systems subjected to antibiotics has not been successfully developed considering bioreactor performance, microbial community dynamics and microbial activity dynamics at the same time. To observe this in autotrophic nitrogen removal systems, a partial-nitritation biofilter was subjected to a continuous loading of antibiotics mix of azithromycin, norfloxacin, trimethoprim, and sulfamethoxazole. The effect of the antibiotics mix over the performance, bacterial communities and bacterial activity in the system was evaluated. The addition of antibiotics caused a drop of ammonium oxidation efficiency (from 50 to 5%) and of biomass concentration in the bioreactor, which was coupled to the loss of ammonium oxidizing bacteria Nitrosomonas in the bacterial community from 40 to 3%. Biomass in the partial nitritation biofilter experienced a sharp decrease of about 80% due to antibiotics loading, but the biomass adapted and experienced a growth by stabilization under antibiotics feeding. During the experiment several bacterial genera appeared, such as Alcaligenes, Paracoccus, and Acidovorax, clearly dominating the bacterial community with >20% relative abundance. The system reached around 30% ammonium oxidation efficiency after adaptation to antibiotics, but no effluent nitrite was found, suggesting that dominant antibiotics-resistant phylotypes could be involved in nitrification–denitrification metabolisms. The activity of ammonium oxidation measured as amoA and hao gene expression dropped a 98.25% and 99.21%, respectively, comparing the system before and after the addition of antibiotics. On the other hand, denitrifying activity increased as observed by higher expression of nir and nos genes (83.14% and 252.54%, respectively). In addition, heterotrophic nitrification cyt c-551 was active only after the antibiotics addition. Resistance to the antibiotics was presumably given by ermF, carA and msrA for azithromycin, mutations of the gyrA and grlB for norfloxacin, and by sul123 genes for sulfamethoxazole. Joined physicochemical and microbiological characterization of the system were used to investigate the effect of the antibiotics over the bioprocess. Despite the antibiotics resistance, activity of Bacteria decreased while the activity of Archaea and Fungi increased.

Antimicrobial stewardship in the treatment of skin and soft tissue infections

BACKGROUND

Research on treating skin and soft tissue infections (SSTI) has shown improved patient outcomes with effective pharmaceutic prescribing. Antimicrobial stewardship programs can reduce consequences of broad-spectrum antimicrobial administration in SSTI treatment.

METHODS

Prospective and historic control data were collected during two 7-month periods. Intervention consisted of implementing a new SSTI evidence-based treatment algorithm and provider education, including calls and medical record notes targeted at physicians.

RESULTS

Of 412 patients, 76 and 86 were found eligible from the historic and intervention groups, respectively. The intervention group had a higher prevalence of appropriate antibiotic usage (33% vs 19%, respectively; P = .04). There was a lower median number of days from intravenous antibiotic therapy to oral conversion (3 vs 5; P < .0001) and a lower median number of days of antipseudomonal antibiotic use (3 vs 5; P = .03) in the intervention group, respectively. The intervention group also had fewer documented SSTI treatment complications (1% vs 8%, respectively; P = .04). The positive outcomes outlined demonstrate potential impacts made from the use of multidisciplinary antibiotic stewardship initiatives.

CONCLUSIONS

Appropriate use of antimicrobial agents under the direction of an antimicrobial stewardship program can lead to improved outcomes for patients being treated for SSTIs.