Mitigating the risk of transfusion-transmitted bacterial infections in hematology oncology patients.

Abstract

e19047 Background: Hospital acquired infections create major logistical, financial, and patient safety concerns within the healthcare system. Bacterial contamination (BC) of platelet components (PCs) can lead to transfusion-transmitted bacterial infections (TTBI), central line-associated bloodstream infections, and sepsis, with long-term complications and/or death. In the US, hematopoietic stem cell transplant (HSCT) recipients require transfusion support until engraftment and together with hematology/oncology (hemonc.) patients receive the highest number of PCs/patient. FDA’s Guidance recommends approaches to reduce BC risk including the use of enhanced bacterial culture screening (EBSC) or pathogen reduction (PR) of platelets. Methods: The Miami Cancer Institute (MCI) implemented PR-PCs for all allogeneic HSCT patients. Irradiation, CMV testing, and bacterial screening have been discontinued for PR-PCs. Transfusion outcomes are being monitored using active hemovigilance (HV) reporting. Results: Considering the fatality risk associated with BC of PCs (1:200,000 – 1:1,000,000) despite the use of optimal skin cleansing, initial sample diversion, and primary bacterial culture, 1/2,880 PCs are still contaminated (Bloch et al.); further steps towards BC mitigation are needed. As the UK and US reported a residual BC risk of 5.4-9.4/million PCs after implementation of EBSC, PR may represent an alternative approach with other cumulative benefits. Indeed, national HV data from France, Switzerland and Belgium reported no sepsis transfusion reactions since PR implementation (Benjamin et al.). In addition, the risk of TA-GVHD and other TTI including emerging infectious diseases (EID) may be decreased after the inactivation of pathogens and leukocytes (Lanteri et al.). At MCI, the percentage of transfused PR-PCs has been increasing steadily from 7.9% in July 2019 to 22.2% in January 2021. Over a 19 month-period, a total of 9,296 PC were transfused including 1,677 PR-PCs. While non-PR-PCs were all irradiated and bacterially screened, PR-PC were neither irradiated nor bacterially screened. No cases of TA-GVHD or TTI were reported. A total of 27 mild, non-life-threatening platelet transfusion reactions were reported including 22 (81.5%) after non-PR PCs transfusion and 5 (18.5%) after PR-PC transfusion. In addition, the early release of transfusion-ready fresh PR-PCs 24-48 hours after collection has proven invaluable in providing clinicians and patients with blood continuity during the COVID-19 pandemic. Conclusions: Though certain measures have improved blood safety, the risk of TTI associated with PC transfusion remains a concern for vulnerable hemonc. patients. Using PR-PC is especially important to consider when patients undergo extensive life-saving therapies such as bone marrow transplants.