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Luteal phase deficiency: abnormal gonadotropin and progesterone secretion patterns
M R Soules1, D K Clifton, N L Cohen
1Department of Obstetrics, University of Washington, Seattle 98195.
The Journal of Clinical Endocrinology and Metabolism
|October 1, 1989
Summary
Luteal phase deficiency (LPD) in women is linked to abnormal gonadotropin secretion patterns, specifically a faster luteinizing hormone (LH) pulse frequency in the early follicular phase. This may cause inadequate corpus luteum support and lower progesterone levels, contributing to infertility.
Area of Science:
- Reproductive endocrinology
- Hormonal regulation of the menstrual cycle
- Infertility research
Background:
- Luteal phase deficiency (LPD) is a recognized cause of infertility and recurrent pregnancy loss.
- The precise hormonal mechanisms underlying LPD, particularly concerning gonadotropin secretion, remain incompletely understood.
- Previous research suggests a potential link between abnormal pulsatile secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) and the development of LPD.
Purpose of the Study:
- To investigate the hypothesis that abnormal gonadotropin secretion patterns contribute to Luteal Phase Deficiency (LPD).
- To compare the pulsatile secretion patterns of LH and progesterone (P) during the follicular and luteal phases in women with and without LPD.
- To determine if altered progesterone pulse characteristics explain the reduced mean serum progesterone levels observed in women with LPD.
Main Methods:
- Frequent blood sampling (every 10 minutes for 12 hours) was conducted during the follicular and luteal phases in 20 women with LPD and 21 normal women.
- Serum levels of LH, FSH, and progesterone (P) were assayed in each sample.
- Pulsatile secretion patterns were analyzed using an adaptive threshold method to determine pulse frequency and amplitude.
Main Results:
- Women with LPD exhibited a significantly higher LH pulse frequency in the early follicular phase compared to normal women (12.8 vs. 8.2 pulses/12h).
- Progesterone pulse amplitude and mean serum progesterone levels were significantly lower in women with LPD during the luteal phase.
- Serum FSH levels did not differ between groups in either the early or late follicular phases, and LH pulse frequency was similar across follicular phases in the LPD group.
Conclusions:
- An excessively rapid LH pulse pattern in the early follicular phase may impair corpus luteum support, manifesting as LPD.
- Reduced progesterone pulse amplitude is identified as the primary mechanism for inadequate progesterone secretion in women with LPD.
- Normal FSH levels suggest that compromised folliculogenesis is unlikely to be the etiological factor for LPD in this cohort.