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Metformin administration is more effective when non-obese patients with polycystic ovary syndrome show both hyperandrogenism and hyperinsulinemia.
Gynecol Endocrinol. 2007 Mar; 23(3):146-52.GE

Abstract

BACKGROUND

Polycystic ovary syndrome (PCOS) is a common endocrine disease that is frequently observed to be related to increased insulin resistance independent of body weight. The use of insulin-sensitizer compounds, such as metformin, permits great improvement of such metabolic abnormality, restoring ovarian function and gonadal steroid synthesis and reducing insulin resistance.

AIM

On this basis we aimed to evaluate a group of non-obese amenorrheic PCOS patients before and after 6 months of metformin administration (500 mg orally twice daily) to better understand upon which basis of clinical and endocrine parameters metformin administration might be chosen as a putative therapeutic tool.

METHOD

A group of non-obese PCOS patients (n = 42) was enrolled after informed consent. They underwent an oral glucose tolerance test for insulin, glucose and C-peptide levels and provided blood samples for determination of plasma levels of luteinizing hormone (LH), follicle-stimulating hormone, prolactin, estradiol, androstenedione, 17-hydroxyprogesterone, insulin, cortisol and testosterone levels on two occasions: before and on day 7 of the first menstrual cycle occurring after the 5th month of treatment.

RESULTS

Plasma LH, estradiol, insulin and C-peptide were decreased significantly by metformin treatment in the entire group of PCOS patients. When subdividing PCOS patients according to insulin sensitivity (i.e. hyper- and normoinsulinemic subjects), a greater rate of positive endocrine changes was observed in hyperinsulinemic patients and the highest rate was observed in hyperinsulinemic hyperandrogenic subjects. Menstrual cyclicity was recovered in all patients under treatment.

CONCLUSIONS

Our data show that metformin modulates ovarian function and greatly affects LH secretion through reduction of the hyperandrogenic condition. The highest rate of endocrine changes was observed in the hyperinsulinemic hyperandrogenic non-obese PCOS patients. Our study demonstrates that metformin administration is more appropriate in hyperinsulinemic hyperandrogenic non-obese PCOS patients.

Authors+Show Affiliations

Department of Obstetrics and Gynecology, University of Modena and Reggio Emilia, Modena, Italy. algen@unimo.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Journal Article

Language

eng

PubMed ID

17454168

Citation

Genazzani, Alessandro D., et al. "Metformin Administration Is More Effective when Non-obese Patients With Polycystic Ovary Syndrome Show Both Hyperandrogenism and Hyperinsulinemia." Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology, vol. 23, no. 3, 2007, pp. 146-52.
Genazzani AD, Lanzoni C, Ricchieri F, et al. Metformin administration is more effective when non-obese patients with polycystic ovary syndrome show both hyperandrogenism and hyperinsulinemia. Gynecol Endocrinol. 2007;23(3):146-52.
Genazzani, A. D., Lanzoni, C., Ricchieri, F., Baraldi, E., Casarosa, E., & Jasonni, V. M. (2007). Metformin administration is more effective when non-obese patients with polycystic ovary syndrome show both hyperandrogenism and hyperinsulinemia. Gynecological Endocrinology : the Official Journal of the International Society of Gynecological Endocrinology, 23(3), 146-52.
Genazzani AD, et al. Metformin Administration Is More Effective when Non-obese Patients With Polycystic Ovary Syndrome Show Both Hyperandrogenism and Hyperinsulinemia. Gynecol Endocrinol. 2007;23(3):146-52. PubMed PMID: 17454168.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Metformin administration is more effective when non-obese patients with polycystic ovary syndrome show both hyperandrogenism and hyperinsulinemia. AU - Genazzani,Alessandro D, AU - Lanzoni,Chiara, AU - Ricchieri,Federica, AU - Baraldi,Enrica, AU - Casarosa,Elena, AU - Jasonni,Valerio M, PY - 2007/4/25/pubmed PY - 2007/6/27/medline PY - 2007/4/25/entrez SP - 146 EP - 52 JF - Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology JO - Gynecol Endocrinol VL - 23 IS - 3 N2 - BACKGROUND: Polycystic ovary syndrome (PCOS) is a common endocrine disease that is frequently observed to be related to increased insulin resistance independent of body weight. The use of insulin-sensitizer compounds, such as metformin, permits great improvement of such metabolic abnormality, restoring ovarian function and gonadal steroid synthesis and reducing insulin resistance. AIM: On this basis we aimed to evaluate a group of non-obese amenorrheic PCOS patients before and after 6 months of metformin administration (500 mg orally twice daily) to better understand upon which basis of clinical and endocrine parameters metformin administration might be chosen as a putative therapeutic tool. METHOD: A group of non-obese PCOS patients (n = 42) was enrolled after informed consent. They underwent an oral glucose tolerance test for insulin, glucose and C-peptide levels and provided blood samples for determination of plasma levels of luteinizing hormone (LH), follicle-stimulating hormone, prolactin, estradiol, androstenedione, 17-hydroxyprogesterone, insulin, cortisol and testosterone levels on two occasions: before and on day 7 of the first menstrual cycle occurring after the 5th month of treatment. RESULTS: Plasma LH, estradiol, insulin and C-peptide were decreased significantly by metformin treatment in the entire group of PCOS patients. When subdividing PCOS patients according to insulin sensitivity (i.e. hyper- and normoinsulinemic subjects), a greater rate of positive endocrine changes was observed in hyperinsulinemic patients and the highest rate was observed in hyperinsulinemic hyperandrogenic subjects. Menstrual cyclicity was recovered in all patients under treatment. CONCLUSIONS: Our data show that metformin modulates ovarian function and greatly affects LH secretion through reduction of the hyperandrogenic condition. The highest rate of endocrine changes was observed in the hyperinsulinemic hyperandrogenic non-obese PCOS patients. Our study demonstrates that metformin administration is more appropriate in hyperinsulinemic hyperandrogenic non-obese PCOS patients. SN - 0951-3590 UR - https://www.unboundmedicine.com/medline/citation/17454168/Metformin_administration_is_more_effective_when_non_obese_patients_with_polycystic_ovary_syndrome_show_both_hyperandrogenism_and_hyperinsulinemia_ L2 - https://www.tandfonline.com/doi/full/10.1080/09513590701214398 DB - PRIME DP - Unbound Medicine ER -