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Background: In Japan, no platelet (PLT) additive solutions (PASs) are officially approved for clinical use although blood centers often receive requests for washed PLTs to reduce adverse reactions. Recently, we developed a novel PAS called BRS-A based on clinically available bicarbonated Ringer’s solution (BRS), Bicanate and acid–citrate–dextrose formula A (ACDA), which has been shown to maintain the in vitro properties of PLTs in the condition of <5% residual plasma during 7-day storage. The aim of this study was to evaluate whether another clinically available BRS, Bicarbon with different electrolyte concentrations can be used as a PAS. Study design and methods: Two types of BRS-As were prepared by adding 25 mL of ACD-A to 500 mL of Bicanate or Bicarbon BRSs. Bicanate-based BRS-A and Bicarbon-based BRS-A contain 0.9 or 0.5 mmol/L of magnesium chloride, 95.2 or 100.1 mmol/L of sodium chloride, 4.2 or 5.1 mmol/L of trisodium citrate, and 26.6 or 23.8 mmol/L of sodium bicarbonate, respectively; the other components were identical. Apheresis PLTs stored in these solutions with less than 5% plasma for 7-day storage were compared with regard to their in vitro properties. Results: The pH levels of all units were above 7 throughout storage. The mean PLT volume, hypotonic shock response, glucose consumption, lactate production, swirling, and CD62P and CD42b expression were similar during 7-day storage. The bicarbonate levels in Bicarbonbased BRS-A were lower than those in Bicanate-based BRS-A. Conclusion: Differences in concentrations of electrolytes such as magnesium, sodium, citrate, and bicarbonate salts in BRS-A do not affect the in vitro properties of PLTs during 7-day storage. These results indicate that the use of another type of BRS-A based on Bicarbon as a PAS is feasible. Thus, BRS-A can be used in hospitals that do not stock Bicanate but have

nihon yuketsu saibou chiryou gakkaishi

STORAGE OF WASHED PLATELETS IN BRS-A PLATELET ADDITIVE SOLUTIONS BASED ON TWO TYPES OF CLINICALLY AVAILABLE BICARBONATED RINGER'S SOLUTIONS WITH DIFFERENT ELECTROLYTE CONCENTRATIONS