In a three-year bicentric cross-sectional investigation on type I diabetic children aged between 6 and 18 years, blood sugar profiles and spontaneous thrombocyte aggregation were reported besides anamnestic and clinical data. In the children treated with human insulin, raised spontaneous thrombocyte aggregation was significantly more frequent than in those treated with porcine insulin. At the same time, blood sugar fluctuation from day to day measured between 7 and 9 a.m. tended to be raised in the children treated with human insulin; the fluctuation in the diurnal profile measured over 14 days was indeed very much greater. Since the two groups were comparable as to sex distribution, age, duration of disease, quality of compensation, application and dose of insulin, the greater fluctuation of blood sugar in the children treated with human insulin appears to be the cause for the raised spontaneous thrombocyte aggregation.
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