Assessing the effectiveness of whole blood-derived platelets stored as a pool: a randomized block noninferiority trial

Department of Medicine and Pathology and Molecular Medicine, McMaster University, and the Canadian Blood Services, Hamilton, Ontario, Canada.

Transfusion. 2005;45((6):):896-903.

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BACKGROUND Prestorage pooling of whole blood-derived platelets (PLTs) would simplify bacterial detection. This study evaluated the in vivo effect of the prestorage pooling of PLTs stored for up to 5 days, by assessing the corrected count increment (CCI) 18 to 24 hours after transfusion of the product. STUDY DESIGN AND METHODS A randomized block noninferiority design was used. Eligible patients had chemotherapy-induced thrombocytopenia and were considered likely to need at least six PLT transfusions. For every block of two transfusion events, one consisted of PLTs stored individually and then pooled before transfusion, and the other was a product pooled before storage. The primary outcome was categorized as a successful (>4. 5) or unsuccessful ( RESULTS Twenty-three eligible patients received a total of 189 PLT transfusions. The median number of PLT transfusions was 7 (range, 0-27). Eighty-five complete transfusion pairs were used in the primary analysis. The proportions of transfusions leading to a CCI of greater than 4. 5 was identical for both routine and PLTs pooled before storage (45/85=52. 9%; relative risk, 1. 00; lower limit of the one-sided 95% confidence interval [CI], 0. 83). The estimate of the mean difference in CCI between pooled and routine storage (pooled-routine) was -0. 45 (95% CI, -2. 23 to 1. 33; p=0. 63). CONCLUSION These results provide evidence that storage of PLTs as a pool for up to 5 days results in posttransfusion CCIs that are not inferior to PLTs stored individually.
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Credits : Bibliographic data from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine