'No action today means no cure tomorrow': the threat of antimicrobial resistance

In vitro research of combination therapy for multidrug-resistant Klebsiella pneumoniae bloodstream infections

Objective

Multidrug-resistant Klebsiella pneumoniae (MDR KP) bloodstream infections are a serious problem. The objective of this study was to investigate the effects of appropriate combination therapies on MDR KP bloodstream infections.

Methods

MDR KP strains isolated from clinical samples were assessed for antibiotic susceptibility using the broth microdilution method. Twenty consecutive MDR KP clinical isolates from patients with bloodstream infections were examined in this study. The experiments were conducted at the Bacterial Laboratory of Tongde Hospital from March to August 2021. Antibiotic combination tests were performed using the minimum inhibitory concentration (MIC) test, and the sum of the fractional inhibitory concentration was used to assess synergy.

Results

Following treatment with a combination of two antibiotic agents, the MIC50 and MIC90 values decreased compared with that before treatment. MIC50 decreased by at least 50%, with one value reduced to 6.25% of the pretreatment value. None of the antibiotic combinations were antagonistic. Combination of polymyxin B with rifampicin or tigecycline had a synergistic effect on 70% and 65% of the strains, respectively.

Conclusions

In vitro combination therapies with two active drug agents (polymyxin B plus rifampicin or tigecycline) had a better effect on MDR KP infections compared with that in other regimens.

Nurse role and contribution to antimicrobial stewardship: An integrative review

AIM

To examine existing published literature regarding nurses and antimicrobial stewardship, and their potential role and contribution, to identify what is known, to evaluate methodologies used in published research, and to review and integrate findings to inform practice and future priorities for research.

DESIGN

Integrative review.

METHODOLOGY

The approach to this review was informed by Whittemore and Knafl's integrative review methodology. Electronic databases were searched for papers published since the start of the database to November 2019, with abstracts available, related to humans and published in English. Papers were included regardless of practice setting (acute, aged, and primary care) and if they were research based, included nurses as participants and reported specifically on results from nurses or that had implications for nursing practice. Excluded were conference abstracts, and papers focussed solely on nurse prescriber, nurse practitioner, or nurse manager roles.

RESULTS

Fifty-two papers were included in the review. Identified themes were: i) nursing knowledge, learning needs and education; ii) nurse perceptions of the nursing role and motivations for involvement; iii) nursing brokerage and influence on information flow to and from patients; iv) nursing workflow, workload and workarounds; and v) nurse leadership. Methodological quality of the included papers varied, limiting transferability and applicability of findings for some of the included studies.

CONCLUSION

Formal inclusion of nurses in antimicrobial stewardship activities has been associated with improved nurse knowledge, nurse confidence, and in some cases improved clinical outcomes for patients. The review reinforces nursing values as a motivator of nursing actions, and reveals the complex yet significant influence of nurses on antimicrobial prescribing. Potential opportunities to enhance nurses' participation and contribution to antimicrobial stewardship include; formal acknowledgement of the nurse role, educating nurses so that they are aware of how they can contribute, collaborating with nurses in planning and implementing local stewardship activities, and ensuring nurse leaders are involved. However, evidence on this topic remains limited. Research is needed to facilitate greater understanding about the nature, scope and influence of the nurse role in antimicrobial stewardship, how nurses enact and carry out their role, and nurses' support needs. Tweetable abstract: Integrative review explores #nurse role in #antimicrobialstewardship. Nurse contribution, influence significant, but not well understood.

Alternative to antibiotics for managing asymptomatic and non-symptomatic bacteriuria in older persons: a review

Recurrent urinary tract infection (UTI) is one of the most common reasons for long-term antibiotic use in frail older people, and these individuals often have non-symptomatic bacteriuria. This article reviews the literature and recommendations for the treatment of UTIs particularly in the older population (>65 years). It considers the question: is there an alternative for antibiotics for asymptomatic and non-symptomatic bacteriuria in older adults? D-mannose powder has been recommended for the treatment of UTIs, as when applied locally, it reduces the adherence of Escherichia coli. In one study, D-mannose was reviewed for the prophylaxis of recurrent UTIs in women, and the findings indicated that it may be useful for UTI prevention instead of prophylactic antibiotics. There is a lack of information about the efficacy of cranberry products combined with D-mannose in this regard, and this is an area for further research.