Abstract
Certain platelet functions were evaluated in 24 patients with secondary polycythaemia (SP) and in a large number of patients suffering from myeloproliferative disorders (MD'S): 89 patients with chronic myeloid leukaemia (CML) at different stages of development, 58 with polycythaemia vera (PV), 23 with essential thrombocythaemia (ET), and 25 with agnogenic myeloid metaplasia (AMM). Bleeding time, epinephrine-induced platelet aggregation and adhesiveness agreed with those generally reported in the literature; they are independent of thrombocytosis, the haemoglobin level and the leucocyte count. Macrothrombocytosis, evaluated by an electronic method, was only found in CML, mainly during acute blast crisis. An increased percentage of light platelets was a constant feature in all groups except in the SP and in 20% of the PV. The most severe abnormalities were observed in AMM and CML in the acute stage; in the chronic phase of CML there is no correlation between the severity of platelet abnormalities and the survival of the patients.
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