We investigated the ability of platelets from two groups of diabetics type I and two groups of healthy volunteers matched of age to generate thromboxane B2 (TXB2) during spontaneous clotting of whole blood. The serum concentration of TXB2, reflecting the ability of the platelets to generate TXA2 during clotting, was measured by gas liquid chromatography. Platelets from old diabetics with more than 40 years duration of diabetes mellitus formed significantly less TXB2 than those from old healthy controls. Platelets from juvenile diabetics (9 years duration of disease) formed nearly the same amount of TXB2 as those from young healthy volunteers. The importance of these results is discussed.
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