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  • Title: Gonadotrophin response to luteinizing hormone releasing factor (LRF) in puerperal women.
    Author: Nakano R, Kayashima F, Mori A, Kotsuji F, Hashiba N, Tojo S.
    Journal: Acta Obstet Gynecol Scand; 1974; 53(4):303-7. PubMed ID: 4613104.
    Abstract:
    Gonadotropin response to luteinizing hormone releasing factor (LRH) was studied in puerperal women. 20 normal lactating puerperal women ranging in age from 24 to 36 years received an intravenous injection of 200 mcg LRH 1-5 weeks postpartum. Blood samples were obtained prior to, and 15, 30, 45, 60, and 120 minutes after, the injection for follicle-stimulating hormone (FSH) and luteinizing hormone (LH) determinations. FSH levels were low but detectable prior to the injection. LRF failed to stimulate FSH secretion in the 1st postpartum week. 4 of 6 subjects in the 3rd postpartum week responded to LRF with a rise of FSH and LH. In the 5th postpartum week, all 6 subjects responded to LRF with a concomitant rise in FSH and LH. These results indicate that gonadotropic activity of the anterior pituitary is suppressed until about the 5th postpartum week. It might be assumed that puerperal anovulation is due to hypothalamic-pituitary dysfunction the 1st 5 weeks postpartum and due to hypothalamic disorders after the 5th postpartum week.
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