Between 1980-1986 seven patients underwent AB0-major incompatible bone marrow transplantation. Incompatible anti-A and anti-B antibodies could be decreased by the plasma exchange from titers 8-256 down to 0-8. Our practice combined with additional depletion of erythrocytes from marrow allowed to transplant all patients successfully, however, one patient demonstrated an acute haemolytic reaction during infusion of marrow. Plasma exchange was fairly well tolerated, however, 4 patients developed slight urticarial reactions. Both thrombocytopenic patients overcompensated the platelet loss caused by the exchange.
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