title: A multicenter evaluation of the routine use of a new white cell-reduction apheresis system for collection of platelets.
abstract: BACKGROUND
  Residual white cells (WBCs) cause serious side effects in platelet transfusion. An in-line WBC-reduction system based on fluidized particle bed technology was recently developed as a modification of an existing plateletpheresis system.
  
  
  METHODS
  In an investigational phase, three flow profiles were evaluated using prototype software in five centers, each using their standard conditions. In the confirmatory phase, the released software was tested in three centers. WBCs were counted in two full Nageotte grids (dilution 1-in-5).
  
  
  RESULTS
  With the prototype software, WBC levels were always below 1 x 10(6) per procedure (median, 25,000/procedure; n = 314). One profile proved to be superior to the other two with respect to platelet yield and residual WBCs, and it was incorporated in the released WBC-reduction system, together with a built-in process control. Median residual WBCs in these WBC-reduction system components not rejected by the process control were 19,000 per procedure (n = 211/225 total), with 99.5 percent of the platelet components having less than 1 x 10(6) WBCs.
  
  
  CONCLUSIONS
  The protocol selected in the initial phase, now available as a WBC-reduction system, results in platelet concentrates with very low residual WBC levels. This satisfies even the most stringent criteria for WBC reduction in platelets, without the platelet loss typically seen with conventional fiber filtration.
authors.affiliation: Centre d'Hémobiologie-Transfusion Pitié-Salpêtrière, Paris, France.
authors.forename: J J
authors.initials: JJ
authors.lastname: Fournel
authors.forename: J
authors.initials: J
authors.lastname: Zingsem
authors.forename: J
authors.initials: J
authors.lastname: Riggert
authors.forename: L
authors.initials: L
authors.lastname: Muylle
authors.forename: N
authors.initials: N
authors.lastname: Müller
authors.forename: M
authors.initials: M
authors.lastname: Köhler
authors.forename: J L
authors.initials: JL
authors.lastname: Beaumont
authors.forename: M
authors.initials: M
authors.lastname: Baeten
authors.forename: R
authors.initials: R
authors.lastname: Eckstein
authors.forename: G
authors.initials: G
authors.lastname: van Waeg
mesh_terms: D001792:Blood Platelets; D001800:Blood Specimen Collection / Q000379:methods; D005374:Filtration; D006801:Humans; D007937:Leukapheresis / Q000379:methods*; D008954:Models, Biological; D015337:Multicenter Studies as Topic; D012984:Software