Background/Case Studies: Oxidative damage limits the shelf life of PRBC. Hypoxia is expected to limit the damage and potentially help extend shelf life. The major determinant of shelf life is viability after transfusion whose indirect indicator is intracellular ATP. Leukoreduction is known to improve storage quality whereas irradiation is known to aggravate storage lesions. While gas packs are routinely used in microbiology laboratories to generate anaerobic conditions, their application in blood banking has not been previously reported. This study hypothesized that it could protect PRBCs from storage lesions.
Study
Design/Methods: Hypoxia was generated by commercial H2 & CO2 releasing gas-pack in Gas-Jar (Himedia) used routinely by microbiology, modified by CO2 absorbent Soda lime. The study had a split bag design of 30 CPD-SAGM PRBCs, one 50 ml split in gas jar, and another 50 ml split from same bag in ambient air, both in transfer bags (Terumo) parallelly in refrigeration, weekly sampling. Three sub-groups: 10 no modification, 10 leukoreduction (LR), 10 irradiation.
Results/Findings: ATP levels were consistently higher in hypoxic arms across all time points. By day 7, hypoxic units showed significantly higher ATP compared to normoxia (4.02±0.65 vs 3.81±0.61 μmol/gm Hb, p=0.037). The divergence increased by day 14 (4.68±0.84 vs 3.99±0.66 μmol/gm Hb, p< 0.001) and day 21 (4.26±0.79 vs 3.21±0.60 μmol/gm Hb, p< 0.001), progressively larger effect-sizes (Cohen's d: 0.40, 1.06, and 1.48). Sub-group analysis revealed that hypoxia benefits across all modification types, both LR and irradiated units maintaining higher ATP under hypoxia. The protective effect in irradiated units suggesting it could protect from irradiation-induced damage. All hypoxic units maintained ATP above 3.5 μmol/gm Hb through day 21 (higher than d0 mean of 3.3), suggesting improved post-transfusion viability. Conclusions: This pilot data from an ongoing study demonstrates, for the first time, that commercially available H2 packs—routinely used in microbiology but never before tested in blood banking—can effectively help preserve PRBC quality. This novel application provides a convenient, accessible method for making PRBC units with better viability due to significantly higher ATP levels throughout storage. The protective effect was observed across all modifications, and in hypoxic arm ATP had much steeper rise from d7 to peak d14, then shallower decline to values above baseline even on d21. The counteracting effect of hypoxia on storage lesions was particularly evident after irradiation, suggesting a potential for extending shelf life of these short-dated components. These findings offer a novel but simple approach to improve PRBC quality without complicated equipment, just simple hacks added to standard blood banking procedures. Further studies on post-transfusion recovery are warranted to validate this promising strategy.
