Resumen

VELAZQUEZ-MALDONADO, Elsy M; MONSALVE V, Yajaira J; VILLARROEL, Vanesa  y  ARATA-BELLABARBA, Gabriela. Utilidad de la prueba de tolerancia oral a la glucosa para el cálculo de los índices de sensibilidad a la insulina y su importancia diagnóstica en el síndrome de ovarios poliquísticos. Rev. Venez. Endocrinol. Metab. [online]. 2005, vol.3, n.1, pp.17-24. ISSN 1690-3110.

Objective: To compare the insulin indexes obtained from oral glucose tolerance (OGTT) in polycystic ovary syndrome (PCOS). Methods: Thirty-five PCOS women aged 18-35 years and 45 healthy control women were studied. Body mass index (BMI), waist circumference (WC), and waist-to-hip ratio were registered. According to BMI, women were categorized as lean (L:19-24.9), overweight (Ow:25-29.9) and obese (Ob:>30). Plasma glucose and insulin were measured at baseline and 30, 60 and 120 minutes after oral glucose load (75g). Homeostasis model assessment (HOMAIR), quantitative insulin sensitivity check index (QUICKI) and insulin sensitivity index (ISI-MF) were calculated. Results: Both fasting glucose and 30 minutes post glucose were significantly higher in lean PCOS women as compared with controls (p<0.001). AUC-G did not show any significant difference between patients and controls. Fasting insulin was significantly higher only in lean PCOS women (p<0.01). AUC-I, increased significantly as a function of BMI increment in both study groups, although higher values were observed in PCOS women (p<0,001). HOMAIR value increased concomitantly with BMI increase, however, lean PCOS showed a significant higher value than control group (p<0,05). Both patients and controls showed lower values of QUICKI and ISI-MF index related to increments of BMI, however, lean PCOS women had a significant lower value than lean controls. Regression analysis in control group showed that HOMAIR was positively correlated with BMI, waist-to-hip ratio and waist circumference, while QUICKI e ISI-MF were inversely correlated with these variables. These correlations were not observed when analysis was performed in PCOS group. Conclusions: insulin sensitivity indexes appear to be useful for early detection of insulin resistance in both lean and overweight women with PCOS.

Palabras clave : Oral glucose tolerance test; insulin sensitivity index; PCOS.