The thrombocyte reactivity and values of HbA1c, serum cholesterine and creatinine have been examined in 121 insulin-treated and 70 not-insulin-treated diabetic patients and in 98 healthy persons. The thrombocyte functions of patients ranged according to the microangiopathic complications and of control groups matched according to age and sex were analysed with comparative statistics. Positive correlation was found in diabetes between the serum creatinine and cholesterine levels and the aggregating agents' (adrenaline, ADP, and collagen) limit concentrations (p less than 0,05-0,001). Close correlation seems to be between the worsening of renal functions and the decrease of thrombocyte sensitivity in diabetes: The hypercholesterinemia observable in nephropathic diabetes did not lead to the hyperaggregability known in familial hypercholesterinemia. Thus it appears likely that the cholesterine-level increase in the serum does not influence directly, but rather by the effects in connection with its origin, differently the thrombocyte reactivity.
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