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  • 1
    ISSN: 1432-0428
    Keywords: Type 1 (insulin-dependent) diabetes mellitus ; islet-cell antibodies ; insulin secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Basal insulin secretion was compared in nine islet-cell antibody positive, non-diabetic first-degree relatives of children with Type 1 (insulin-dependent) diabetes mellitus and nine normal control subjects matched for age, sex and weight. Acute insulin responses to a 25 g intravenous glucose tolerance test were similar in the two groups (243 (198–229) vs 329 (285–380) mU·l−1·10min−1, mean (±SE), p=0.25). Fasting plasma insulin was assayed in venous samples taken at one min intervals for 2 h. Time series analysis was used to demonstrate oscillatory patterns in plasma insulin. Autocorrelation showed that regular oscillatory activity was generally absent in the islet-cell antibody positive group, whereas a regular 13 min cycle was shown in control subjects (p〈 0.0001). Fourier transformation did, however, show a 13 min spectral peak in the islet-cell antibody positive group, consistent with intermittent pulsatility. We conclude that overall oscillatory patters of basal insulin secretion are altered in islet-cell antibody positive subjects even when the acute insulin response is within the normal range.
    Type of Medium: Electronic Resource
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