Related Experiment Video
Updated: May 3, 2026
12:03
Fertility Preservation in Patients with Severe Ovarian Dysfunction
Published on: March 25, 2021
4.4K
Ovarian function in chronic renal failure: evidence suggesting hypothalamic anovulation
Annals of Internal Medicine
|July 1, 1980
Summary
Uremic women often experience ovarian dysfunction due to impaired positive estradiol feedback, affecting the pituitary ovarian axis. This study investigated hormone levels to understand the underlying mechanisms of reproductive issues in kidney disease.
Area of Science:
- Endocrinology
- Nephrology
- Reproductive Medicine
Background:
- Uremia is associated with ovarian dysfunction, impacting reproductive health in women.
- The precise mechanisms of ovarian dysfunction in uremia require further elucidation.
Purpose of the Study:
- To evaluate the pathogenesis of ovarian dysfunction in uremic patients.
- To assess the pituitary ovarian axis function in women with uremia.
Main Methods:
- Measured plasma levels of follicle-stimulating hormone (FSH), luteinizing hormone, prolactin, estradiol, and progesterone.
- Administered clomiphene, ethinyl estradiol, and bromocriptine to assess hormonal responses.
- Compared hormonal profiles in premenopausal and postmenopausal uremic women.
Main Results:
- Premenopausal uremic women showed normal follicular phase hormone levels but elevated luteinizing hormone and absent cyclicity.
- Clomiphene stimulated luteinizing hormone, FSH, and estradiol, while ethinyl estradiol failed to induce a luteinizing hormone surge.
- Postmenopausal uremic women had undetectable estradiol and elevated gonadotropins.
- Bromocriptine partially restored ovulation in only one of three patients.
Conclusions:
- The negative estradiol feedback and tonic gonadotropin secretion appear normal in uremic women.
- The positive estradiol feedback mechanism, crucial for cyclic luteinizing hormone release, is impaired in uremia.
- Ovarian dysfunction in uremia is characterized by an abnormal positive feedback loop in the pituitary ovarian axis.
Related Concept Videos
02:07Oogenesis
58.4K
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...
58.4K
01:27Ovarian Cycle
5.4K
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...
5.4K
01:30Hormonal Control of the Ovarian Cycle
5.1K
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...
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...
5.1K
01:29Acute Kidney Injury II: Pathophysiology
2.3K
Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
2.3K
01:25Chronic Kidney Disease I: Introduction
1.4K
Chronic Kidney Disease (CKD) arises when the kidneys progressively lose their ability to function, ultimately leading to end-stage renal disease. At this advanced stage, the kidneys can no longer filter waste or maintain essential body functions, requiring renal replacement therapy (RRT) through dialysis or a kidney transplant for survival.Early-stage chronic kidney disease and detection challengesIn CKD's early stages, symptoms often remain absent because healthy nephrons compensate for...
1.4K
01:24Chronic Kidney Disease II: Clinical Manifestations
1.1K
Chronic Kidney Disease (CKD) progressively impairs multiple body systems due to the accumulation of uremic toxins, which disrupt cellular functions across various organs.Neurologic symptomsNeurologic symptoms often arise early in CKD, as uremic toxin buildup drives changes in cognitive and motor functions. Patients frequently experience fatigue, headache, confusion, difficulty concentrating, and, in severe cases, seizures. Peripheral neuropathy commonly manifests as burning sensations in the...
1.1K