The hemostatic effectiveness of platelet concentrates cryopreserved in a vapor phase of liquid nitrogen were evaluated after transfusion of 14 concentrates to 6 patients. Transfusion of AB0 and Rh-compatible platelet concentrates elevated the number of circulated platelets in donors by about 24 G/L. The mean corrected count increment (C.I.) after 001 and 24 hours post transfusion was 14.694 and 7.735/microliters/m2/10(11) respectively. Decrease of haemorrhagic diathesis, and correction of bleeding time in all cases have been observed.
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