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Hormonal Control of the Ovarian Cycle01:30

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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
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Oogenesis02:07

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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Oogenesis01:22

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Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
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The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle...
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The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
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Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...
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Human Egg Maturity Assessment and Its Clinical Application
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GnRHa trigger for final oocyte maturation: is HCG trigger history?

Peter Humaidan1, Birgit Alsbjerg2

  • 1Faculty of Health, Aarhus University, Denmark; The Fertility Clinic, Skive Regional Hospital, Skive, Denmark.

Reproductive Biomedicine Online
|July 22, 2014
PubMed
Summary

Gonadotrophin-releasing hormone analogues (GnRHa) trigger reduces ovarian hyperstimulation syndrome. Modified luteal phase support protocols now yield reproductive outcomes comparable to human chorionic gonadotrophin (HCG) triggers.

Keywords:
GnRHaHCGIVFOHSSluteal phase supportovulation trigger

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Area of Science:

  • Reproductive Endocrinology
  • Infertility Treatment
  • Assisted Reproductive Technology

Background:

  • Gonadotrophin-releasing hormone analogues (GnRHa) enable final oocyte maturation triggering.
  • GnRHa trigger significantly reduces or eliminates ovarian hyperstimulation syndrome (OHSS) risk compared to human chorionic gonadotrophin (HCG).
  • Initial studies indicated luteal phase insufficiency following GnRHa trigger with standard luteal phase support.

Purpose of the Study:

  • To evaluate modified luteal phase support protocols after GnRHa trigger.
  • To compare reproductive outcomes between GnRHa trigger with optimized support and HCG trigger.
  • To establish a tailored approach for luteal phase support based on ovarian response.

Main Methods:

  • Review of clinical trials and research on GnRHa trigger protocols.
  • Analysis of luteal phase support modifications.
  • Comparison of reproductive outcomes (e.g., pregnancy rates) in different patient groups (normal- and high-responders).

Main Results:

  • Modified luteal phase support protocols have improved outcomes after GnRHa trigger.
  • Reproductive success rates are now comparable to HCG trigger in normal- and high-responders.
  • GnRHa trigger allows for individualized luteal phase support strategies.

Conclusions:

  • Optimized luteal phase support protocols are effective following GnRHa trigger.
  • GnRHa trigger, with appropriate luteal phase management, offers a viable alternative to HCG trigger.
  • Future use of GnRHa trigger is anticipated for women receiving GnRH antagonists.