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Брой: 2/2000
Автор: Ц. Танкова, Л. Даковска, Г. Кирилов, Д. Коев, Клиничен център по ендокринология и геронтология, Медицински университет – София
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It is the purpose of the study to assay the importance of insulin secretion phases, measured during IVGTT, and anti-GAD65 antibodies as β-cell autoimmune marker, in making early exact diagnosis of the type of diabetes in normal-weight patients, aged 30-45 years. Forty-two newly diagnosed diabetic patients (25 men and 17 women), at mean age 37,2 ± 6,9 years and BMI 24,4 ± 2,7 kg/m2 are covered by the study. Nineteen subjects with normal glucose tolerance at mean age 36,8 ± 7,4 у and mean BMI 24,3 ± 2,3 kg/m2, serve as controls. According to data from IVGTT and anti-GAD65 antibodies the diabetic patients are divided up in two groups: type 1 diabetic patients (n = 19), showing loss of first (FPIS) and second (SPIS) phases of insulin secretion – 13,2 ± 5,2 mU/l vs 114,4 ±41,2 mU/l in the control group (p < 0,001), and 15,3 ± 6,5 mU/l vs 63,2 ± 20,1 mU/l in the control group (p < 0,001), respectively, as well as high prevalence of anti-GAD65 antibodies – 73,7%; and type 2 diabetic patients (n = 23) demonstrating decline of FPIS – 25,8 ±11,3 mU/l (p < 0,001 as compared to healthy controls, and p < 0,01 as compared to type 1 diabetic patients, and relatively preserved but retarded second phase insulin response (61,4 ± 17,8 mU/l, p > 0,1 as compared to healthy controls), none of them being anti-GAD65 positive. IVGTT allows for precise assessment of the insulin secretion phases, and in conjunction with anti-GAD65 antibodies contribute to make exact early diagnosis of the type of diabetes in normal-weight newly diagnosed patients, aged 30-45 years. The approach outlined proves clinically relevant in terms of discrimination between type 1 and type 2 diabetes, and adequate treatment prescription.
Keywords: IVGTT, insulin secretion, anti-GAD65 antibodies, diagnosis, type 1 diabetes, type 2 diabetes.
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