title: Posttransfusion 24-hour recovery and subsequent survival of allogeneic red blood cells in the bloodstream of newborn infants.
abstract: BACKGROUND
  The feasibility, efficacy, and safety of transfusing stored allogeneic RBCs has been demonstrated for small-volume transfusions given to infants. We measured the posttransfusion recovery and intravascular survival of allogeneic RBCs stored up to 42 days to further elucidate their efficacy.
  
  
  METHODS
  Preterm infants were transfused with 1.0 mL of biotinylated RBCs plus 15 mL per kg of unlabeled allogeneic RBCs. Posttransfusion infant blood samples obtained at 10 minutes, and at 1, 2, 4, 7, 10, 14, and 21 days were used to determine the 24-hour posttransfusion recovery (PTR(24)), mean potential life span (MPL), and time to disappearance of 50 percent of biotinylated RBCs (T(50)).
  
  
  RESULTS
  No significant differences were found between allogeneic RBCs stored 1 to 21 days versus 22 to 42 days for PTR(24), MPL, or T(50), indicating comparable posttransfusion circulation, regardless of storage age. Although MPL and T(50) values in infants using biotinylated RBCs were short, compared to those expected using chromium-labeled RBCs in adults, they agreed with results reported by others using biotinylated RBCs.
  
  
  CONCLUSIONS
  Satisfactory posttransfusion RBC recovery and survival, measured with biotinylated RBCs, support earlier clinical trials that established the efficacy and safety of stored allogeneic RBCs for small-volume transfusions given to infants. The relatively short MPL and T(50) values in some infants may underestimate true survival due to ongoing erythropoiesis and infant growth with commensurate increase in blood volume during the time of RBC survival studies. Because values in infants differ from those expected using chromium-labeled RBCs in adults, and the number of posttransfusion determinations was few, additional studies are needed to define the mechanisms involved.
authors.affiliation: Department of Pathology and Pediatrics, University of Iowa Roy J and Lucille A Carver College of Medicine, University of Iowa Hospitals and Clinics, Iowa City, Iowa 52242-1009, USA. ronald.strauss@uiowa.edu
authors.forename: Ronald G
authors.initials: RG
authors.lastname: Strauss
authors.forename: Donald M
authors.initials: DM
authors.lastname: Mock
authors.forename: John A
authors.initials: JA
authors.lastname: Widness
authors.forename: Karen
authors.initials: K
authors.lastname: Johnson
authors.forename: Gretchen
authors.initials: G
authors.lastname: Cress
authors.forename: Robert L
authors.initials: RL
authors.lastname: Schmidt
mesh_terms: D000328:Adult; D019921:Biotinylation; D001782:Blood Donors; D001793:Blood Preservation; D002470:Cell Survival; D017707:Erythrocyte Transfusion; D005240:Feasibility Studies; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature / Q000097:blood*; D010290:Parents; D012449:Safety; D013997:Time Factors