Objective:
Early review of intravenous (IV) antimicrobial therapy is central to antimicrobial stewardship (AMS), however scalable models for general medical patients are limited. We evaluated a pharmacist-led digital intervention to optimize IV antimicrobial prescribing.
Methods:
A prospective, quasi-experimental before-and-after study was conducted between May 2022 to February 2023 across six general medicine units at a tertiary hospital. AMS recommendations were delivered electronically via Microsoft Teams®. Adult inpatients receiving IV antimicrobials for >24 hours were included, excluding those with COVID-19, under Infectious Diseases consultation or receiving palliative care. The primary outcome was median IV antimicrobial duration. Secondary outcomes included AMS recommendation type, recommendation acceptance, length of stay (LOS), 30-day infection-related readmission, IV therapy recommencement, and inpatient mortality. Antibacterial consumption was analyzed from July 2021 to through December 2024 to evaluate sustained impact.
Results:
Among 723 antimicrobial orders (474 treatment episodes in 458 patients), median IV duration was comparable between phases (intensive: 2.75 days; baseline: 3.00 days). LOS was shorter during the intensive phase compared to baseline (5.5 vs 7.6 days; P = .04), particularly in patients without bacteremia. Readmissions and mortality were unchanged. Of 400 AMS recommendations, 67% were IV-to-oral switches; overall acceptance was 78%. Piperacillin-tazobactam use declined, and sustained reductions in aminoglycosides, ampicillin and IV flucloxacillin were observed. A reduction in total antibiotic prescribing (combined IV and oral prescribing) was also observed.
Conclusions:
The digital pharmacist-led AMS intervention did not reduce IV duration, likely reflecting strong baseline prescribing, but was associated with shorter LOS and a reduction in total antibacterial use. This program offered a scalable, sustainable alternative to resource-intensive face-to-face models.