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  • Title: Pituitary responses in LH secretion to LHRH during pregnancy.
    Author: Miyake A, Tanizawa O, Aono T, Kurachi K.
    Journal: Obstet Gynecol; 1977 May; 49(5):549-51. PubMed ID: 322005.
    Abstract:
    Thirty-six pregnant women and 15 normally menstruating women were each given 100 microng of synthetic luteinizing hormone releasing hormone (LHRH) by a single intravenous injection. Human chorionic gonadotropin (hCG), luteinizing hormone (LH), and follicle stimulating hormone (FSH) levels were determined by specific radioimmunoassay (RIA) technics. For the determination of the serum LH levels, the LHbeta-RIA method, which is unaffected by hCG at sample levels as high as 500 IU/ml, was used. Serum concentrations of LH and FSH were lower in pregnant women than in the normal women in the follicular and luteal phases. While the release of LH was observed in pregnant women following the administration of LHRH, the average net increase was less than that seen in both the follicular and luteal phases. During pregnancy, there was a progressive decrease in the LH response to LHRH, but no release of FSH. The effect of a single iv injection of luteinizing hormone (100 mcg) (LH)-releasing hormone (LH-RH) on serum levels of human chorionic gonadotropin (HCG), LH, and follicle stimulating hormone (FSH) was studied in 36 pregnant and 15 normally menstruating women. Pregnant women had lower concentrations of LH and FSH than normally menstruating women in the follicular and luteal phases. Administration of LH-RH increased LH in pregnant women, but not to the extent observed in the follicular and luteal phases. Further, pregnant subjects showed a progressive decrease in the LH response to LH-RH, while FSH concentrations remained unaffected. The findings are in accord with previously reported results.
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