Implementation of a Pharmacist-Led Culture and Susceptibility Review System in Urgent Care and Outpatient Settings
Background: Increasing prevalence of antibiotic resistance is an urgent public health threat. The purpose of this project is to implement a pharmacist-managed culture review service to decrease and prevent inappropriate use of antibiotics. This service will intervene in cases of mismatched antibiotic–bacteria combinations to decrease health care provider (HCP) and nursing interruptions, improve patient outcomes, and enhance prescribing practices to reduce occurrence of antibiotic resistance.
Observations: Patients requiring changes in antibiotic therapy after culture and susceptibility results were identified through the electronic health record. After results were returned, pharmacists assessed the antibiotic for appropriateness. If the isolated organism was not susceptible to the empiric antibiotic, the pharmacist adjusted the regimen, counseled the patient, documented the intervention electronically, and notified the HCP via an electronic note. Follow-up phone calls assessed for adverse effects and answered patient questions. Pharmacists could change antibiotic therapy without contacting HCPs because of an antimicrobial stewardship care coordination agreement between HCPs and pharmacists. Previously, HCPs were responsible for evaluating culture and susceptibility results as well as adjusting antimicrobial regimens. After implementing this project, 10 interventions were made out of 320 patients from August 2019 to February 2020.
Conclusions: Appropriateness of antibiotic therapy through antimicrobial stewardship could help combat the significant public health issue of antibiotic resistance.
Implementation
Data gathered through a CPRS dashboard from August 2019 to February 2020 identified patients with pending or completed culture results in urgent care and primary care settings (eAppendix 4). The dashboard was created specifically for this project to show patient details that included initial antibiotic(s) prescribed and preliminary and final culture results. After a mismatched combination was identified, pharmacists contacted patients and assessed symptoms. If a patient was still symptomatic, the pharmacist changed the antibiotic regimen and educated the patient about this change. The pharmacist documented an intervention note in CPRS and added the HCP as a signer so he or she would be aware of the change. The clinical pharmacist followed up after regimens were complete. At this time, the pharmacist assessed patients to ensure the medication was taken as directed (eg, number of days of therapy, how many tablets per day, etc), to discuss any reported adverse effects, and to assess resolution of symptoms. If a patient still had symptoms, the pharmacist contacted the patient’s primary care provider. If the veteran could not be contacted after 3 consecutive attempts via phone, a certified letter was mailed. If patients were asymptomatic at the time of the call, the pharmacist documented the lack of symptoms and added the HCP as a signer for awareness purposes. HCPs continued to practice as usual while this service was implemented.
Observations
Using the culture and susceptibility dashboard, the pharmacist identified 675 patients as having a pending culture (Table 1). Among these patients, 320 results were positive, and were taking antibiotics empirically. Out of the 320 patients who met inclusion criteria, 10 required pharmacist intervention. After contacting the veterans, 7 required regimen changes because their current antibiotic was not susceptible to the isolated organism. Three additional patients were contacted because of a mismatch between the empiric antibiotic and culture result. Antibiotic therapy was not modified because these patients were asymptomatic at the time the clinical pharmacist contacted them. These patient cases were discussed with the HCP before documenting the intervention to prevent initiation of unwarranted antibiotics.
Most of the modified antimicrobial regimens were found in urine cultures from symptomatic patients (Table 2). Of the 7 patients requiring therapy change because of a mismatch antibiotic–bacteria combination, 4 were empirically prescribed fluoroquinolones, 2 received levofloxacin, and 2 were prescribed ciprofloxacin. According to the most recent antibiogram at our facility, some organisms are resistant to fluoroquinolones, specifically Proteus mirabilis (P mirabilis) and Escherichia coli (E coli). These pathogens were the cause of urinary tract infections in 3 of 4 patients with fluoroquinolone prescriptions.
Through the CPRS dashboard, the pharmacist inadvertently identified 4 patients with positive culture results who were not on antibiotic therapy. These patients were contacted by telephone, and antibiotics were initiated for symptomatic patients after consultation with the HCP. The primary culture type intervened on was urine in 12 of 14 cases (86%). The other 2 culture types included oropharynx culture (7%) positive for an acute bacterial respiratory tract infection caused by group C Streptococcus and a stool culture (7%) positive for Pseudomonas aeruginosa (P aeruginosa). E coli (36%) was isolated in 5 cases and was the most commonly isolated organism. P
Discussion
This project was an innovative antimicrobial stewardship endeavor that helped initiate antibiotic interventions quickly and improve patient outcomes. The antimicrobial stewardship pharmacist independently performed interventions for patients without requiring HCP consultation, therefore decreasing HCP burden and possibly reducing time to assessment of culture results.
Limitations
The study results were limited due to its small sample size of antimicrobial interventions. The clinical pharmacist did not contact the patient when the antibiotic prescribed empirically by the HCP was appropriate for the isolated organism. Among the patients contacted, 3 were asymptomatic, did not require further antibiotic therapy, and no intervention was made. Provider education was deemed successful because HCPs did not request further information about the service. However, not all HCPs were provided education because of different shifts and inability to attend educational sessions. Closely working with lead physicians within the facility provided an alternate method for information dissemination.
The care coordination agreement allowed the pharmacist to make changes if patients had a current prescription for an antibiotic. In addition to the changes to antibiotics, this project improved HCP awareness of culture results even in cases of symptomatic patients who were not prescribed therapy. When this occurred, the pharmacist contacted the patient to assess symptoms and then notified the HCP if the patient was symptomatic.
