Human Reproduction, Vol. 17, No. 1, 76-82,
January 2002
© 2002 European Society of Human Reproduction and Embryology
Insulin sensitivity in non-obese women with polycystic ovary syndrome during treatment with oral contraceptives containing low-androgenic progestin
1 Department of Obstetrics and Gynecology, Charles University, Apolinarska 18, Prague 2, 120 00, 2 Department of Internal Medicine, Charles University, U Nemocnice 1, Prague 2, 120 00, and 3 Institute of Endocrinology, Narodni trida 11, Prague 1, 100 00, Czech Republic
BACKGROUND: Combined oral contraceptives (COC) effectively suppress hyperandrogenism in women with polycystic ovary syndrome (PCOS), though deterioration of insulin sensitivity during treatment is assumed. The study aim was to investigate insulin action and androgen production during treatment with COC containing low-androgenic progestin. METHODS: A total of 13 PCOS women and nine controls was enrolled into the study. Only non-obese women with a body mass index (BMI) 
30 kg/m2 were included. Hyperinsulinaemic euglycaemic clamp techniques were performed before and after 6 months of treatment with a monophasic COC containing norgestimate. RESULTS: Anthropometric parameters [BMI, waist:hip ratio (WHR)] remained unaltered during the study in both groups. No deterioration in glucose disposal rate (M), insulin sensitivity index (ISI) or metabolic clearance rate of glucose (MCRG) was observed during treatment in PCOS subjects. Fasting glucose decreased significantly (P < 0.01), but fasting insulin remained unchanged. Significant decreases in concentrations of testosterone (P < 0.001), androstenedione (P < 0.01) and dihydroepiandrosterone (DHEA) (P < 0.001), a decrease in the free androgen index, and an increase in concentrations of sex hormone-binding globulin were found in PCOS subjects. CONCLUSIONS: The norgestimate-containing COC significantly decreased androgen production and concentrations of free androgens, without reducing insulin sensitivity in non-obese PCOS subjects.
Key words: androgens/insulin sensitivity/norgestimate/oral contraceptives/PCOS
4 To whom correspondence should be addressed. E-mail: david.cibula{at}iol.cz
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