SummaryA group of patients with clinical hemorrhagic disease who exhibited a prolonged bleeding time and a short prothrombin consumption time classified as Thrombocytopathy A were studied utilizing procedures involving isolated platelets and purified prothrombin. These frozen and thawed platelet extracts had poor platelet factor 3 activity which was normal after the extracts had been treated with ultrasonic oscillations. The electron microscope studies of the morphology of these platelets were abnormal. It is concluded that these platelets contain adequate amounts of platelet factor 3 but are resistant to disintegration and the activity is only liberated with difficulty.The authors wish to thank Miss Jeanne M. Riddle, M.S. medical technologist in Hematology at Henry Ford Hospital for technical assistance in providing the platelet counts for this investigation.
SummaryThrombocytopenic serum supports a short prothrombin consumption time, however, the same serum contains as little prothrombin as normal serum. The prothrombin consumption test of thrombocytopenic serum can be prolonged by adsorption on BaCO3 or reduced again by the addition of the sodium citrate eluate. The antihemophilic activity of thrombocytopenic blood disappears when the blood clots as in normal blood and autoprothrombin I is present in much smaller amounts than in normal serum. The authors suggest that a new factor, a possible derivative of prothrombin, is responsible for the short prothrombin consumption value in thrombocytopenic blood.
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