These results indicate a benefit of preSF TH as compared with postSF TH based on the following parameters: decrease in cytokine levels, less platelet activation, maintenance of higher pH, and more efficient use of stored platelets (27% of postSF TH were lost because of plugging of filters). These results apply particularly to the Autopheresis C systems with its high initial WBC content.
Paroxysmal nocturnal haemoglobinuria (PNH) is an acquired haemolytic anaemia, clonal in nature, due to somatic mutation. PNH may evolve to aplastic anaemia; more rarely to a myelodysplastic syndrome (MDS) or to acute myeloid leukaemia (AML). We have studied a patient who suffered from PNH and later developed refractory anaemia with ringed sideroblasts (RARS) associated with trisomy 8. By testing peripheral blood cells with appropriate antibodies we have shown that all of the red cells, neutrophils and monocytes, as well as 20% of the lymphocytes, belonged to the PNH clone; in contrast, only 43% of neutrophils and 22% of monocytes belonged to the MDS clone. We infer that the MDS must have arisen from within the PNS clone.
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