In 16 patients affected with acute leukemia (7 patients with acute lymphatic leukemia and 9 patients with acute myeloid leukemia) the resonance thrombogramme was recorded during cytostatic induction therapy, coagulation factor XIII (subunit XIII-A, XIII-S) and further hemostasiological parameters were determined. Subunit XIII-A was lowered to 36%, subunit XIII-S to 65% and the fibrin formation time of the resonance thrombogramme was extended to 9 minutes. There exists a negative correlation between component XIII-A and fibrin formation time r = -0.48 (p less than 0.01). The influence exerted by diminishing factor XIII and fibrin(ogen) splitting products on the fibrin formation time was investigated in in-vitro tests. A diminution of factor XIII below 10% will extend the fibrin formation time to about 10 minutes, an increase of fibrin(ogen) splitting products to 100 micrograms/ml to about 3 minutes.
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