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In order to investigate the effect of long-term suppression of the gonadotrophin axis in polycystic ovary syndrome, eight affected subjects were given s.c. infusions of gonadotrophin-releasing hormone (GnRH) agonist buserelin for 12 weeks. Hormone measurement and ultrasound studies were carried out weekly, from 6 weeks before to 12 weeks after administration of buserelin. An overnight dexamethasone-suppression test was carried out before and after treatment.

Maximal suppression of LH to below the lower limit of that in normal subjects occurred after 6 weeks of treatment with buserelin. Plasma testosterone and androstenedione fell to normal levels during the infusion but reached pretreatment levels during the follow-up period. There was no effect of buserelin on plasma dehydroepiandrosterone sulphate or sex hormone-binding globulin. Ovarian size decreased significantly during the infusion with the disappearance of cysts in six subjects. After cessation of buserelin therapy, there was rapid and spontaneous ovulation which occurred within 3 weeks in all subjects. The results suggest that treatment with this GnRH agonist facilitates ovulation in this condition.

Journal of Endocrinology (1990) 125, 317–325

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