Default Antibiotic Order Durations for Skin and Soft Tissue Infections in Outpatient Pediatrics: A Cluster Randomized Trial.

Background: Antibiotic durations for uncomplicated skin/soft tissue infections (SSTI) often exceed the guideline-recommended 5-7 days. We assessed the effectiveness of a default duration order panel in the Electronic Health Record to reduce long prescriptions.

Methods: Cluster randomized trial of an SSTI order panel with default antibiotic durations (implemented 12/2021), compared to a control panel (no decision support) in 14 pediatric primary care clinics. We assessed long prescription rates from 23 months before to 12 months after order panel implementation (1/2020-12/2022). Antibiotic duration was considered long if >5 days for cellulitis or drained abscess, or >7 days for undrained abscess, impetigo, or other SSTI.

Results: We included 1123 and 511 encounters in intervention and control clinics, respectively. In a piecewise generalized linear model, the long prescription rate decreased from 63.8% to 54.6% (absolute difference, -9.2%) in the intervention group and from 70.0% to 54.9% (absolute difference, -15.1%) in the control group. The relative change in trajectories from pre-panel to post-panel periods did not differ significantly between intervention and control groups (P = .488). Although used in only 29.4% of eligible encounters, intervention panel use had lower odds of long prescription compared to all other prescriptions (odds ratio 0.18).

Conclusions: We did not detect an overall impact of an order panel with default durations in reducing long antibiotic prescriptions for SSTIs. When ordered from the intervention panel, prescriptions were usually guideline-concordant. Effective strategies to make choosing a default duration more automatic are necessary to further reduce long prescriptions.