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Diabetes Care 30:471-478, 2007
DOI: 10.2337/dc06-0618
© 2007 by the American Diabetes Association
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Clinical Care/Education/Nutrition
Original Article

Effects of Medical Therapy on Insulin Resistance and the Cardiovascular System in Polycystic Ovary Syndrome

Caroline Meyer, PHD1, Barry P. McGrath, MD1 and Helena Jane Teede, PHD1,2

1 Centre for Vascular Health, Department of Medicine, Monash University, Melbourne, Victoria, Australia
2 Jean Hailes Foundation for Women’s Health, Monash Institute for Health Services Research, Southern Health, Melbourne, Victoria, Australia

Address correspondence and reprint requests to Prof. Helena Teede, Jean Hailes Director of Research, Monash Institute for Health Services Research, Level 1 Block E, MMC, 242 Clayton Rd., Clayton, Melbourne, Victoria, Australia 3168. E-mail: helena.teede{at}med.monash.edu.au

OBJECTIVE—We aimed to determine the impact of medical therapy for symptom management on insulin resistance, metabolic profiles, and surrogate markers of cardiovascular disease in polycystic ovary syndrome (PCOS), an insulin-resistant pre-diabetes condition.

RESEARCH DESIGN AND METHODS—One hundred overweight women (BMI >27 kg/m2), average age 31 years, who were nonsmokers, were not pregnant, did not have diabetes, and were off relevant medications for 3 months completed this 6-month open-label controlled trial. Randomization was to a control group (higher-dose oral contraceptive [OCP] 35 µg ethinyl estradiol [EE]/2 mg cyproterone acetate, metformin [1 g b.d.] or low-dose OCP [20 µg EE/100 µg levonorgestrel + aldactone 50 mg b.d.]). Primary outcome measures were insulin resistance (area under curve on oral glucose tolerance test) and surrogate markers of cardiovascular disease including arterial stiffness (pulse wave velocity [PWV]) and endothelial function.

RESULTS—All treatments similarly and significantly improved symptoms including hirsutism and menstrual cycle length. Insulin resistance was improved by metformin and worsened by the high-dose OCP. Arterial stiffness worsened in the higher-dose OCP group (PWV 7.46 vs. 8.03 m/s, P < 0.05), related primarily to the increased insulin resistance.

CONCLUSIONS—In overweight women with PCOS, metformin and low- and high-dose OCP preparations have similar efficacy but differential effects on insulin resistance and arterial function. These findings suggest that a low-dose OCP preparation may be preferable if contraception is needed and that metformin should be considered for symptomatic management, particularly in women with additional metabolic and cardiovascular risk factors.

Abbreviations: AUC, area under the curve • DHEAS, dehydroepiandrosterone • EE, ethinyl estradiol • FAI, free androgen index • FMD, flow-mediated vasodilation • HOMA, homeostasis model assessment • IR, insulin resistance • OCP, oral contraceptive • OGTT, oral glucose tolerance test • PCOS, polycystic ovary syndrome • PWV, pulse wave velocity • SHBG, sex hormone–binding globulin • WHR, waist-to-hip ratio


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