The Role of Clinical Pharmacists in Patients with Suspected Allergy to β-Lactams: A Systematic Review

Journal: Advances in Medicine and Engineering Interdisciplinary Research DOI: 10.32629/ameir.v2i3.2268

Jesus Cotrina Luque1, Maria José Rei1, Miriam Capoulas1, Cláudia Santos1, Pedro Raimundo2

1. Pharmaceutical Services, Hospital Da Luz, Lisbon, Portugal.
2. Intensive Care Medicine Department, Luz Hospital, Lisbon, Portugal.

Abstract

Objective: To analyze the role played by the clinical pharmacist and its impact in antibiotic stewardship facing suspected allergy to beta-lactam antibiotics. Method: We performed 2 different independent bibliographic searches. A total of 35 articles were found, and the final number included in the study was 12. We analyzed the articles and collected variables of efficacy, safety, and applicability of evaluation tools applied to patients with suspected allergy to beta-lactams. Also, the variation in the consumption and prescription profile of alternative antibiotics was analyzed. Results: The selected studies analyzed questionnaires, allergy delabeling, intradermal tests, and oral challenge tests performed by pharmacists. Significant differences in the efficacy endpoint were found in 4 studies in favor of pharmaceutical intervention. In the study of Kwiatkowski et al., cefazolin use increased in surgical patients after pharmacist intervention (28% vs 65%; P < 0 .01). In a quasi-experimental study, the mean defined daily dose of aztreonam and the mean days of therapy per 1,000 patients/day decreased (21.23 vs 9.05, P  < 0.01) and (8.79-4.24, P = 0.016), pre- and post-intervention, respectively, increasing antibiotic de-escalations (P < 0.01). In another quasi-experimental study, the prescription of restricted use antibiotics decreased (42.5% vs 17.9%, P  < 0 .01) and the use of pre-surgical prophylactic antibiotics alternative to cefazolin (81.9% vs 55.9%, P  <  0.01) in another study. Other study showed that the mean time per interview was 5.2 min per patient. No adverse events were reported in any study. Conclusion: The pharmacist intervention in the evaluation of the patient with suspected allergy to beta-lactams is effective, safe, and feasible to implement on daily clinical practice. The standardization of protocols to clarify the history of allergies and development of evaluation tools represents simple screenings to perform delabeling or refer to the immunoallergology service, improving penicilin use and reducing the need for second-line antibiotics. More studies are needed to standardize the desensitization tests made by pharmacists. However, despite these results, the involvement and leadership of the pharmacist in this area is limited and constitutes a future challenge for the profession.

Keywords

beta-lactams (β-Lactams); allergy; antibiotic stewardship; antibiotic administration; pharmacist; pharmacy

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Copyright © 2024 Jesus Cotrina Luque, Maria José Rei, Miriam Capoulas, Cláudia Santos, Pedro Raimundo

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