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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.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
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Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
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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 female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
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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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From PCOS to PMOS: perspectives on the new nomenclature - Authors' reply.

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Related Experiment Video

Updated: Jan 5, 2026

Author Spotlight: Investigating the Mechanisms and Inducing Models of Polycystic Ovary Syndrome
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Author Spotlight: Investigating the Mechanisms and Inducing Models of Polycystic Ovary Syndrome

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Curtailing PCOS.

Selma Feldman Witchel1, Helena J Teede2,3, Alexia S Peña4

  • 1Department of Pediatrics, Division of Pediatric Endocrinology, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA, USA. selma.witchel@chp.edu.

Pediatric Research
|October 19, 2019
PubMed
Summary
This summary is machine-generated.

Polycystic ovary syndrome (PCOS) diagnosis and care face challenges due to inconsistent criteria and provider knowledge. Early identification and evidence-based guidelines are crucial for managing PCOS comorbidities across the lifespan.

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Area of Science:

  • Reproductive endocrinology
  • Adolescent medicine
  • Women's health

Background:

  • Polycystic ovary syndrome (PCOS) is a common endocrine disorder affecting women, often beginning in adolescence.
  • Challenges in PCOS diagnosis include inconsistent criteria, variable provider expertise, and lack of consensus, leading to under- or overdiagnosis.
  • These diagnostic issues negatively impact affected women, delaying interventions for associated comorbidities, particularly during the transition to adult care.

Purpose of the Study:

  • To address challenges in PCOS care by developing and disseminating International Evidence-Based PCOS Guidelines.
  • To emphasize prevention, screening, and treatment of PCOS and its comorbidities throughout the reproductive lifespan.
  • To reduce the medical, psychosocial, and economic burdens of PCOS through improved provider and patient education.

Main Methods:

  • Development of International Evidence-Based PCOS Guidelines based on meta-analyses.
  • Focus on three major categories of comorbidities: reproductive, metabolic, and psychological.
  • Consideration of PCOS manifestations and comorbidities across the lifecycle, excluding infertility.

Main Results:

  • Healthy lifestyle interventions, including prevention of excess weight gain, are primary for managing all PCOS comorbidities.
  • Early identification of at-risk girls and those diagnosed with PCOS is a key priority.
  • Guidelines provide extensive recommendations for provider and patient education.

Conclusions:

  • Addressing diagnostic inconsistencies and improving provider knowledge are essential for effective PCOS management.
  • Comprehensive, evidence-based guidelines are vital for optimizing PCOS care from adolescence through adulthood.
  • Prioritizing early identification and lifestyle interventions can mitigate the long-term health impacts of PCOS.