• Hideharu Hagiya, Mika Uno, Tsukasa Higashionna, Hiroyuki Honda, and Fumio Otsuka.
• Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Japan.
• Intern. Med. 2023 Jun 15; 62 (12): 173917421739-1742.

AbstractObjective Amid the global spread of antimicrobial resistance, antimicrobial stewardship should be further promoted in the clinical setting. Our previous study suggested an intra-week disproportion of discontinuation of broad-spectrum antibiotics. We therefore explored the generalization of this prescription trend by investigating the use of all intravenous antibiotics. Methods A retrospective, observational study. Patients Between January 1, 2018, and December 31, 2020, we collected data on the initiation and discontinuation of intravenous antimicrobials on each day of the week and on days after holidays at Okayama University Hospital, Japan. We compared the monthly antimicrobial prescription initiation and discontinuation using the Kruskal-Wallis test and Mann-Whitney U-test with Bonferroni correction as a post-hoc procedure. Results Data from 15,293 hospitalized cases were analyzed. The initiation of antimicrobials differed slightly among days of the week, although this trend was clinically insignificant. Compared with the initiations, antimicrobial discontinuations were disproportionately biased among the weekdays, tending to occur on Mondays (p<0.001) about twice as often as on other days. Similarly, antimicrobials were unevenly discontinued on the day after holidays compared to other days (p<0.001), with an approximately 2-fold difference. The use of antimicrobials in the hospital was thus unequally terminated on weekdays. Conclusion To further promote antimicrobial stewardship, clinicians should be aware of the influence of behavioral, environmental, and social factors on antimicrobial prescription, which is seemingly beyond medical indications.

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