Amenorrhea overview
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Amenorrhea, or amenorrhœa, is the absence of a menstrual period in a woman of reproductive age. Physiologic states of amenorrhoea are seen during pregnancy and lactation (breastfeeding), the latter also forming the basis of a form of contraception known as the lactational amenorrhea method. Outside of the reproductive years there is absence of menses during childhood and after menopause. Amenorrhea can be transient, intermittent, or permanent. Amenorrhoea is a symptom with many potential causes.
Historical Perspective
The Egyptian ancient belief honored menstrual blood as a life-giving nature. The Mesopotamian mother goddess, named Ninhursag, believed to create mankind from loam and her "blood of life". The first descriptions about disturbances in menstrual cycle are found in Papyrus Ebres [named after the Egyptologist Georg M. Ebers (1837-1898)], from New Kingdom period (1450-1550 B.C.E). They described the patients as a "women who suffers from the side of her pubic region as an irregularity of her menstruation". In 1907, British Medical Journal, released an article about different types of treatments (mostly herbal and conservative) for amenorrhea. In 1911, some researchers evaluate the therapeutic methods presented 4 years ago and make some suggestions to manage amenorrhea better. The term amenorrhea is derived from Greek language [a = negative, men = month, rhoia = flow], means lack of menstruation cycle in a woman.
Classification
Amenorrhea may be classified according to etiology into three subtypes, including primary amenorrhea, secondary amenorrhea, and functional amenorrhea. Primary amenorrhea is basically referred to a young girl that has not experienced menarche, at all, classified as hypergonadotropic hypogonadism, hypogonadotropic hypogonadism, and eugonadotropic state. Secondary amenorrhea reflects a woman that has ordinary menstruation cycles, experiencing at least 3 months of menstruation cycle absence, classified as polycystic ovary syndrome, hypothalamic-pituitary dysfunction, hypothalamic-pituitary failure, and ovarian failure. Functional amenorrhea is a subtype of the amenorrhea caused by exaggerated different lifestyles, classified as stress, weight loss, and exercise related groups.
Pathophysiology
It is thought that amenorrhea is absence of menstrual cycle, from the beginning of puberty (primary amenorrhea) or after many normal cycles (secondary amenorrhea). Distinguishing between primary and secondary amenorrhea is based on history, solely; because upon every cause of secondary amenorrhea can be a cause of primary amenorhea, indeed. Mainly the pathophysiology of amenorrhea is described in many categories, include hypothalamic, pituitary, thyroid, adrenal, ovarian, uterine, and vaginal pathogenesis. About 25 various genes, in 3 different group of Kallmann syndrome related genes, hypothalamus-pituitary-gonadal (HPG) axis related genes, and obesity related genes, play roles in amenorrhea. On gross pathology, normal endometrium in proliferative or luteal phases are characteristic findings of amenorrhea. Craniopharyngioma gross pathology is cystic mass filled with motor oil-like fluid. On microscopic histopathological analysis, trabecular squamous epithelium surrounded by palisaded columnar epithelium, small-to-medium sized cells with moderate amount of basophilic cytoplasm, bland nuclei, and calcifications are characteristic findings of craniopharyngioma. On microscopic histopathological analysis, loss of fibrous stroma and nested cells of normal anterior pituitary (based on the type of adenoma) are characteristic findings of pituitary adenoma.
Causes
Common causes of amenorrhea include breastfeeding, pregnancy, menopause, and stress. Causes of amenorrhea can be divided upon the classification of the disease, include primary amenorrhea (craniopharyngioma, idiopathic gonadotropin deficiency, Kallmann's Syndrome, Mayer-Rokitansky-Hauser Syndrome, Mullerian dysgenesis, and outflow tract disorders), secondaary amenorrhea (craniocerebral trauma, curettage, Cushing's Syndrome, depression, diabetes mellitus, and drug side effects), and functional amenorrhea (stress, rapid weight loss, and excessive exercise).
Differentiating Amenorrhea from Other Diseases
As amenorrhea manifests in a variety of clinical forms, differentiation must be established in accordance with the particular subtype. Primary amenorrhea must be differentiated from other diseases that cause lack of menstrual cycle, such as Mullerian agenesis, 3-beta-hydroxysteroid dehydrogenase type 2 deficiency, androgen insensitivity syndrome, Kallmann syndrome, Turner syndrome, and 17-alpha-hydroxylase deficiency. In contrast, secondary amenorrhea must be differentiated from other diseases that cause menstrual cycle arrest, such as primary ovarian insufficiency, hypothyroidism, hyperprolactinemia, polycystic ovary syndrome, and Asherman's syndrome.
Epidemiology and Demographics
The incidence of primary amenorrhea is approximately 3,000 per 100,000 individuals, mostly due to hypothalamic amenorrhea. The incidence of secondary amenorrhea is approximately 3,300 per 100,000 individuals in Sweden. The prevalence of amenorrhea is approximately 3,000 to 4,000 per 100,000 individuals worldwide. The prevalence of amenorrhea was estimated to be 13,400 cases per 100,000 female athletes. The case-fatality rate/mortality rate of amenorrhea is approximately below 1%, due to pituitary macroadenomas or generally brain lesions which cause amenorrhea. Primary amenorrhea is usually first diagnosed among adolescence, 16 years of age. There is no racial predilection to amenorrhea. Commonly, it seems that girls from developed countries experience the puberty and menarche earlier than developing countries, due to nutritional and socioeconomic situation. But, since the diagnosis age of primary amenorrhea is based on the society mean age of puberty onset and menarche, therefore there is not any difference between developing and developed countries in prevalence of amenorrhea.
Risk Factors
The most common risk factor in the development of primary amenorrhea is chromosomal disorder and the most common risk factor in the development of secondary amenorrhea is breastfeeding. Common risk factors in the development of amenorrhea include risk factors related to hypothalamus, pituitary, ovaries, and also functional amenorrhea. Most common hypothalamic risk factors are Kallmann syndrome and chronic disorders. Most common pituitary risk factors are hyperprolactinemia and pituitary microadenoma.
Screening
According to the US Preventive Services Task Force (USPSTF), there is insufficient evidence to recommend routine screening for amenorrhea.
Natural History, Complications, and Prognosis
If left untreated, all of patients with amenorrhea may progress to develop infertility and osteoporosis. Common complications of amenorrhea are based on the background disease that induced it. Prognosis is generally excellent and the mortality rate of patients with amenorrhea is approximately less than 1%, generally in brain lesions.
Diagnosis
Diagnostic Criteria
There are no established criteria for the diagnosis of amenorrhea. Diagnosis is based on delayed or absent menstrual cycle.
History and Symptoms
The hallmark of primary amenorrhea is lack of menarche 15 years of age, while other secondary sexual characteristics are already appeared; or lack of menarche after 5 years of thelarche, if it is occurred before 10 years of age. The hallmark of secondary amenorrhea is menstrual cycle interruption for at least 3 months, however was regular before; or menstrual cycle interruption for at least 6 months, however was irregular before.
Physical Examination
Physical examination of patients with amenorrhea is based on underlying disease. The presence of hirsutism and acne on physical examination is diagnostic of polycystic ovary disease. The presence of galactorrhea and vision loss on physical examination is diagnostic of hyperprolactinemia (prolactinoma). The presence of bulging in vulva and imperforated hymen on physical examination is highly suggestive of imperforate hymen.
Laboratory Findings
The most first laboratory tests for evaluating amenorrhea are pregnancy test, thyroid stimulating hormone (TSH), follicle stimulating hormone (FSH), and prolactin (PRL). Second line laboratory tests include free and total testosterone, dehydroepiandrosterone sulfate (DHEAS), and also progesterone challenge test.
Electrocardiogram
There are no ECG findings associated with amenorrhea.
X-ray
There are no X-ray findings associated with amenorrhea, exclusively. There are no X-ray findings associated with most common causes of amenorrhea, like polycystic ovary syndrome (PCOS) and premature ovarian failure. However, an X-ray may be helpful in the diagnosis of delayed puberty.
Echocardiography/Ultrasound
There are no echocardiography findings associated with amenorrhea. However, an echocardiography may be helpful in the diagnosis of the diseases that can cause amenorrhea, such as Turner syndrome. Findings on an echocardiography suggestive of Turner syndrome include bicuspid aortic valve, elongation of transverse aortic arch, coarctation of aorta, and partial anomalous pulmonary venous return (PAPVR). There are no ultrasound findings associated with amenorrhea. However, an ultrasound may be helpful in the diagnosis of the diseases that can cause amenorrhea, such as polycystic ovary syndrome (PCOS), premature ovarian insufficiency, androgen insensitivity syndrome, 17-alpha hydroxylase deficiency, and also anatomic genital defects.
CT scan
There are no CT scan findings associated with amenorrhea. However, a CT scan may be helpful in the diagnosis of the diseases that can cause amenorrhea, such as Turner syndrome, androgen insensitivity syndrome and also anatomic genital defects.
MRI
There are no MRI findings associated with amenorrhea. However, a MRI may be helpful in the diagnosis of the diseases that can cause amenorrhea, such as polycystic ovary syndrome (PCOS), androgen insensitivity syndrome, anatomic genital defects, and also pituitary adenoma.
Other Imaging Findings
Other Diagnostic Studies
Treatment
Medical Therapy
Surgery
Primary Prevention
Secondary Prevention
References