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  • Title: Abnormal glucose tolerance in children with cystic fibrosis: the predictive role of continuous glucose monitoring system.
    Author: Schiaffini R, Brufani C, Russo B, Fintini D, Migliaccio A, Pecorelli L, Bizzarri C, Lucidi V, Cappa M.
    Journal: Eur J Endocrinol; 2010 Apr; 162(4):705-10. PubMed ID: 20071479.
    Abstract:
    UNLABELLED: A long pre-diabetic phase of abnormal glucose tolerance is described in subjects with cystic fibrosis (CF) since childhood. OBJECTIVE: The aims of the study were to compare oral glucose tolerance test (OGTT) and continuous glucose monitoring system (CGMS) in the diagnosis of altered glucose metabolism, and to longitudinally evaluate the role of CGMS in predicting glucose metabolism deterioration in children with CF. METHODS: Seventeen children with CF and 14 controls were enrolled (mean age 13.3+/-3.0 years). All subjects underwent OGTT and CGMS registration. On the basis of OGTT, children were classified as normal glucose tolerance, impaired glucose tolerance (IGT), IGT plus at least one glucose value above 200 mg/dl at intermediate OGTT points (IGT+200) and CF-related diabetes (CFRD). HbA1c, glucose area under the curve, insulin sensitivity, and insulinogenic and disposition indexes were also considered. Subjects with CF underwent another OGTT after 2.5 years. RESULTS: Baseline OGTT revealed 3/17 (7.6%) children with CF with at least one glucose value above 200 mg/dl (1 CFRD and 2 IGT+200), while CGMS revealed 6/17 (35.3%) children with glucose excursions above 200 mg/dl (P=0.010). None of the controls showed glucose over 200 mg/dl either at OGTT or at CGMS. At the 2.5-year follow-up OGTT, all the six subjects who had diabetic glucose excursion (i.e. >200 mg/dl) at baseline CGMS presented IGT+200 or CFRD. In logistic regression analysis, CGMS diabetic excursion was the strongest predictor of IGT+200 and CFRD (P<0.001). CONCLUSIONS: CGMS could be a useful tool to predict glucose metabolism derangements in children affected by CF.
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