1071. Implementation and Impact of an Antimicrobial Tier Structure Along with Prospective Audit and Feedback at a Large Health System: Collaborations for Care Transformation

BACKGROUND: Antibiotic overuse continues to be a challenge in the acute care setting. At AdventHealth Orlando (AHO), pharmacy-led prospective audit with feedback (PAAF) has been the primary stewardship tool. Despite PAAF and criteria for use, overall utilization of high-cost, broad-spectrum agents continues to increase. Recently, the Antimicrobial Stewardship Awareness Program (ASAP) employed transformation medical directors (TMDs) and, along with the pharmacy team, developed a novel concept using an antimicrobial tier structure, in addition to historical PAAF. The purpose was to assess the impact of the tier structure, along with PAAF performed by the pharmacists and TMDs, compared with PAAF alone. METHODS: This retrospective pre (March–August 2018)- and post (October 2018–March 2019) implementation study was conducted at AHO. The ASAP team developed a hospital-wide policy listing antimicrobials based on a tier system (Figure 1), with higher priority agents falling in tiers 3 (T3) and 4 (T4). Education was completed in September 2018 and the process was implemented in October 2018. Criteria for use was evaluated at the point of order entry, followed by PAAF by the pharmacist and TMD. The primary outcome was impact on T3 and T4 antimicrobial utilization, measured in days of therapy (DOT) per 1,000 days present (DP). Secondary outcomes included T3 and T4 antimicrobial cost/adjusted patient-days and rates of hospital-acquired C. difficile infections (CDI). RESULTS: During the post-implementation period, the average DOT per 1,000 DP for T3 and T4 agents decreased by 21.3% (89 vs. 70, P = 0.001) compared with the pre-implementation period (Figure 2). Average T3 and T4 antimicrobial costs decreased by 26% during the post-implementation period ($9.83 vs. $7.27, P < 0.001). Additionally, rates of hospital-acquired CDI decreased by 14% (P = 0.41) during the post-implementation period. CONCLUSION: The tier concept, along with PAAF collaborations between the pharmacists and TMD, allowed for a greater impact on antimicrobial utilization, compared with pharmacist-led PAAF alone. In addition to significant decrease in antimicrobial utilization, substantial cost-savings were demonstrated. A nonsignificant declining trend in the incidence of hospital-acquired CDI was also noted during the post-implementation period. [Image: see text] [Image: see text] DISCLOSURES: All authors: No reported disclosures.