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Reduced insulin sensitivity and the presence of cardiovascular risk factors in short prepubertal children born small for gestational age (SGA)

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Summary Background 

Epidemiological studies have shown that the metabolic syndrome, a combination of type 2 diabetes mellitus, hypertension, dyslipidaemia and a high body mass index (BMI), occurs more frequently among adults who were born with a low birth weight. Because insulin is thought to play a key role in the pathogenesis of this syndrome we investigated insulin sensitivity and risk factors for cardiovascular disease in short prepubertal children born small for gestational age (SGA). Patients and Methods 

Frequently sampled intravenous glucose tolerance tests (FSIGT) were performed in 28 short prepubertal children born SGA. Short stature was defined as a height < –2SD. SGA was defined as a birth length and/or a birth weight for gestational age < –2SD. Twelve short children born appropriate for gestational age (AGA) were used as controls for the FSIGT's results only. AGA was defined as a birth weight and/or birth length for gestational age > –2SD. In short SGA children, blood pressure (BP), fasting levels of serum free fatty acids (FFA), triglycerides (TG), total cholesterol (TC), high-density lipoprotein (HDL) cholesterol and low-density lipoprotein (LDL) were measured and compared to reference values. Results 

Mean insulin sensitivity (Si) level in short SGA children was significantly reduced to 38% of the mean Si level measured in short AGA controls (P = 0·004). Mean acute insulin response (AIR) was significantly higher in SGA children compared to short AGA controls (P < 0·001). Differences in Si and AIR between the two groups remained significant after adjusting for age and BMI (P < 0·001 and P = 0·003, respectively). The mean (SD) systolic BP SDS was 1·3 (1,1), being significantly higher than zero. Mean fasting serum levels of FFA, TC, TG, HDL and LDL were all within the normal range. However, 6 of the 28 SGA children had serum FFA levels above the normal range. Cardiovascular risk factors could statistically be represented in two clusters. Both clusters played a significant role in the development of insulin insensitivity (1/Si). Conclusion 

Although the metabolic syndrome has been described in adulthood, our study showed that risk factors for the development of type 2 diabetes mellitus and cardiovascular disease are already present during childhood in short prepubertal children born SGA, suggesting a pretype 2 diabetes mellitus phenotype.
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Document Type: Research Article

Affiliations: 1: Department of Pediatrics, Division of Endocrinology, Sophia Children's Hospital/Erasmus MC and 2: Department of Medical Psychology and Psychotherapy, NIHES, Erasmus MC, Rotterdam, the Netherlands and 3: Liggins Institute and Department of Pediatrics, University of Auckland, New Zealand

Publication date: January 1, 2005

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