Presentation on theme: "EFI Meeting Ulm 2009 Teaching session: Blood Sweat and Tears Derek O’Neill and Ilias Doxiadis."— Presentation transcript:
EFI Meeting Ulm 2009 Teaching session: Blood Sweat and Tears Derek O’Neill and Ilias Doxiadis
Program BST Crossmatching and Screening M. Howell / D. O’Neill: Examples from the thoracic transplantation I. Doxiadis: Stem cell transplantation: to do or not? C. Navarrete: Transfusion related graft injury (TRALI) NN: Other than HLA targets for antibodies in transplantation I. Doxiadis: The conundrum of single antigen bead testing M. Arnold: IgG1 and complement activation CDC is an old dated method: let’s stop it –Pro: Derek O’Neill –Con: Ilias Doxiadis
Stem cell transplantation some publications Mickelson EM: HLA matching in hematopoietic cell transplantation. Hum Immunol : Ottinger et al: Positive serum crossmatch as predictor for graft failure in HLA-mismatched allogeneic blood stem cell transplantation. Transplantation (8): Narimatsu H: Successful engraftment in crossmatch- positive HLA-mismatched peripheral blood stem cell transplantation after depletion of antidonor cytotoxic HLA antibodies with rituximab and donor platelet infusion. Bone Marrow Transplant : Conclusion:Higher incidence of graft failure, but not a contraindication
Evolution of HLA antibody screening commercialhome made SPA = solid phase assay Evolution of the crossmatch CDC FCM SPA gen SPA sin CDC FCM SPA gen ( ) SPA sin
Immunoglobulin isotype switch IgM IgG 3 IgA 2 IgG 1 IgE IgD IgA 1 IgG 2 IgG 4 One way street sIgM+IgD+ Spriewald, Arnold C’activation
CDC Complement Dependent Cytotoxicity Terasaki PI and McClealand JD: Microdroplet assay of human serum cytotoxins. Nature, 1964: 204: NEGPOS
Conundrum? co ⋅ nun ⋅ drum Spelled Pronunciation [kuh-nuhn-druhm] 1. a riddle, the answer to which involves a pun or play on words, as What is black and white and read all over? A newspaper. 2. anything that puzzles. Origin: 1590–1600; pseudo-L word of obscure orig.
CDC: complement dependent cytotoxicity; ELI: ELISA; LUM: Luminex 75% consensus rule: If 75% of the participants report a specificity than this is regarded as correct; 95% consensus rule: if ≥5% of the participants report a specificity than this is regarded as incorrect Conclusion: the use of two methods lead to better results Example of an External Proficiency Testing exercise
Cardiothoracic Organs Antibody screening & Crossmatching Questions –To crossmatch or not ? CDC/Flow crossmatch ? – timelines involved and organisation Virtual crossmatch? –Antibody screening to support these What methods – what sensitivity? Some examples from two centres
Renal/Pancreatic Antibody screening & Crossmatching EFI - requirements Methods – practicalities and cost Minimum or maximum approach? How sensitive is too sensitive ? Crossmatching - cdc or flow or cdc/flow?