673. Sniffing Out Adherence: Evaluation of a Clostridioides difficile guideline at a Tertiary Academic Medical Center

BACKGROUND: Tufts Medical Center’s (TMC) Antimicrobial Stewardship Team (AMT) in collaboration with gastroenterology (GI) developed an institutional treatment algorithm to guide appropriate inpatient management of Clostridioides difficile infection (CDI). The CD treatment algorithm was revised in April 2022 to reflect updated national clinical practice guidelines and disseminated to TMC providers. Our study aimed to assess provider compliance to TMC’s CD treatment algorithm. METHODS: A retrospective study of adult patients hospitalized from April 15, 2022 to October 31, 2022 and tested for CD was conducted. We collected patient demographics, white blood cell count, serum creatinine (SC), length of stay, CD treatment, Infectious Diseases (ID) & GI consult, occurence of severe CDI (defined as white blood cell > 15 K/uL or SC > 1.5 mg/dL), occurrence of recurrent CDI, and immunocompromised status (defined by having had organ or bone marrow transplant, receiving immunomodulatory therapy or chronic steroids). A 2-step Clostridioides difficile (CD) testing algorithm was used. For CD toxin A/B & glutamate dehydrogenase antigen (GDH) indeterminate results, reflex to nucleic amplification test (NAAT) was performed only with AMT approval. RESULTS: A total of 111 inpatients had CD toxin/GDH stool testing; 70 (63%) positive and 41 (37%) indeterminate. Of patients who had an indeterminate CD toxin/GDH, none had subsequent CD NAAT testing, and none receive CDI treatment. Of the others, 81 (73%), 23 (21%), and 7 (6%) were diagnosed with non-severe, severe, and fulminant CDI, respectively. The overall adherence to the institutional CD treatment algorithm was 58% (figure 1). More patients were appropriately treated with oral vancomycin (11, 65%) compared to those who were appropriately treated with fidaxomicin (9, 24%). Guidance adherence was (3) 38% among patients who had one or more recurrent episodes of CD, and none received suggested ID or GI consultation for additional CDI treatment consideration. [Figure: see text] CONCLUSION: Adherence to institutional CD treatment algorithm was low. This study highlights opportunities to improve prescription of first line CDI therapy, especially among patients who are at higher risk for recurrence. DISCLOSURES: Maureen Campion, PharmD, BCIDP, Shinoigi: Speaker