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Premature ovarian insufficiency (POI) is impairment of the ovaries and how they work before the age of 40 years. It can be caused by multiple factors, one being genetic. Genes and their influence determine the initial number of the primordial follicles, impact on the rate of follicular atresia, and are impactful on the age of menopause.
Hypergonadotropic hypogonadism (HH), also known as primary or peripheral/gonadal hypogonadism or primary gonadal failure, is a condition which is characterized by hypogonadism which is due to an impaired response of the gonads to the gonadotropins, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), and in turn a lack of sex steroid production. [1]
Increased levels of these hormones will cause the body to not start puberty, not undergo menarche, and not develop secondary sex characteristics. [9] [10] If ovarian tissue is present and produces some amount of hormones, limited menstrual cycles can occur. [9] 46,XX gonadal dysgenesis can manifest from a variety of causes. [6]
In men, it causes impaired muscle and body hair development, gynecomastia, decreased height, erectile dysfunction, and sexual difficulties. If hypogonadism is caused by a disorder of the central nervous system (e.g., a brain tumor ), then this is known as central hypogonadism .
Some associated characteristics include short stature, a broad shield-like chest, webbed neck, premature ovarian failure, and heart and kidney abnormalities. [8] People with XX gonadal dysgenesis do not generally have the characteristics just listed, other than the primary ovarian insufficiency.
Hyperprolactinaemia is the most common cause of AHH. It is a well-established cause of infertility in both male and female mammals. [13] Prolactin inhibits GnRH neurons and therefore inhibits the subsequent release of LH, FSH and sex steroids. The mechanism of prolactin induced inhibition of GnRH release is poorly understood. [13]
Primary ovarian insufficiency (POI). This is when a woman’s ovaries stop functioning normally before age 40. This condition is often linked to genetic, metabolic, or immune system disorders ...
In 2015 a research was done on the role of autoimmunity in premature ovarian failure. [11] In 2014 there was an ovarian autoimmune disease research that revealed at least two mechanisms that protect the ovary from an autoimmune attack. [12] Research showed that Theca cells were targeting the autoimmune deficiency within the ovary.