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[Rheologic activation of blood platelets. Preliminary study].

A Couette type coaxial cylinder viscosimeter was used to evaluate the influence of deformation rates up to 20,000/s on blood platelets, in the presence or absence of red cells. Plasma lactate dehydrogenase and haemoglobin levels were determined in order to assess cell lysis and the estimation of beta-thromboglobulin (beta-TG) was considered to be an index of platelet activation. Results for whole blood revealed a change in red cells from 10,000/s upwards, which increased as the rate rose. At the same time, beta-TG rose slowly from the lowest deformation rates then considerably, in relation with the liberation of erythrocytic substances. The rise in LDH and beta-TG levels in platelet rich plasma (PRP) remained small up to 7,000/s approximately, then increased very rapidly, suggesting earlier mechanical and biochemical activation than in whole blood.