-IBIS-1.5.0-
tx
reproductive system
amenorrhea
diagnoses

definition and etiology

definition:
Absence of menstruation.

etiology:
Amenorrhea may be primary (the girl has never begun her periods) or secondary (the woman had her periods once and then stopped having them). Physiologic amenorrhea is the lack of menses before menarche, during pregnancy and early lactation, and after menopause (all considered normal). All other causes of amenorrhea are pathologic.

causes of primary amenorrhea:
physiologic delay: The late onset of menses in a physiologically normal female. No work-up is necessary in the female who has secondary sexual characteristics but no menstrual cycles until she is 18; however, if no secondary characteristics appear by age 14 and no menses has occurred, then a work-up should be started earlier. The age of menarche of the mother will often provide clues as to when the female child should expect to begin.

primary ovarian failure: These patients are divided into two groups: those with normal but infantile genitalia (e.g. Turner's syndrome), and those with ambiguous genitalia (e.g. hermaphrodites). Karyotyping is necessary. Causes include:
» hypothalamic or pituitary failure: Insufficiency or organic disease (tumors, lesions) of either of those organs.
» congenital abnormalities: Vaginal agenesis; vaginal septa; cervical atresia; uterine agenesis; uterine septi; or bicornuate uterus.
» imperforate hymen: This could impede the outflow of the menstruum. The girl will report monthly cyclical abdominal cramping due to the build-up of the menstrual flow. Treatment includes opening the hymen after a needle aspiration of the area behind the hymen demonstrates that a vagina exists.

causes of secondary amenorrhea: (those examples marked "*" mean that they can be secondary or primary, but are usually secondary).

endometrial sclerosis: This usually occurs as a result of a D&C after which the tissues heal by fibrosis.

cervical stenosis: This can occur after a cervical conization, where the cervix scars or the os cannot be found. Intrauterine growths must be ruled out.

anovulation: This may be sporadic or constant. These can be causes for anovulation:
» hypothalamic causes*: The organ disorder may be due to organic lesions (tumors, scars) or insufficiency (polycystic ovarian disease, hyperprolactinemia amenorrhea).
» pituitary causes*: Including insufficiency (Sheehan's syndrome) or organic disease (tumors, adenomas).
» ovarian causes*: From scarring, tumors, cysts.
» low body fat from excess exercise*: (less than 10% body fat). Although this form of anovulation is similar to that which is induced with anorexia nervosa, in this type, when the patient regains weight or stops exercising excessively the period will return.
» adrenal dysfunction: Hyperplasia, adenomas, tumors.
» systemic causes of anovulation: Cushing's disease; post oral contraceptive agent syndrome; hyperprolactinemia; both over and underactive thyroid problems; and other diseases (ulcerative colitis, diabetes mellitus, steroid use for auto-immune diseases, celiac disease). Usually when these diseases are corrected the menses will return to normal.

psychiatric disorders*: These include:
» physical or emotional trauma.
»
chronic stress.
»
anorexia nervosa: Severe malnutrition. Can also be labeled a hypothalamic-pituitary disease.

pregnancy: must be ruled out, as progesterone withdrawal testing, which is done with further analysis of amenorrhea, is teratogenic.

signs and symptoms

signs and symptoms:
• The woman never begins to menstruate OR
• The woman stops menstruating for six months.

lab findings:
Parameters to check depending upon presentation and history:
• FSH and LH levels
• Prolactin levels
• MRI or CT scans to check for hypothalamic or pituitary lesions/tumors.
• Pap smear/conization/ laparoscopy for gynecological lesion/tumor/cyst.
• ACTH/GH/thyroid/corticosteroid levels.
• HCG level for pregnancy.
• chromosome analysis.
• PAP smear for maturation index

course and prognosis

The course and prognosis depend on the cause.

differential diagnosis

• distinguish the cause, based on the differential outlined in "etiology"


footnotes