Gynae: Menstrual Disorders Flashcards
MUST GO OVER MENSTRUAL CYCLE FROM SEM 3
What 4 parameters are used to describe the menstrual cycle and what are the normal parameters?
- Frequency (referring to length of menstrual cycle)
- Regularity (referring to variation in length of menstrual cycle)
- Duration of flow (how many days bleeding for)
- Volume
- Objective (quantity in mLs- on average lose 40mL of blood)
- Subjective (impact on woman’s physical, social, emotional and/or quality of life)
What do we mean by abnormal uterine bleeding?
Broad term that describes irregularities in menstrual cycle; these can abnormalities in frequency, duration, regularity of cycle length and volume of menses.
What does oligomenorrhea mean?
Irregular periods with intervals between menstrual cycles of more than 35 days and/or less than 9 periods per year
State some potential causes of oligomenorrhoea
- Extremes of reproductive age (early periods or perimenopause)
- PCOS
- Physiological stress e.g. excessive exercise, low body weight, chronic disease, psychosocial factors
- Medications
- Progesterone only contraception
- Antidepressants
- Antipsychotics
- Hormonal imbalances
- Thyroid abnormalities
- High prolactin
- Cushing’s syndrome
- Diabetes
Explain why high prolactin can cause oligomenorrhea
- Prolactin inhibits GnRH release from hypothalamus
- Decreased GnRH decreases FSH/LH secretion from anterior pituitary
- Decreased oestrogen production by ovaries
- No oestrogen surge, no ovulation
Explain what menstrual disturbances usually occur in hypothyroid and hyperthyroid women
Both hypothyroid and hyperthyroid women have been reported to have a greater prevalence of menstrual disturbances compared with euthyroid women. Specifically:
- Hypothyroid women are more likely to experience oligomenorrhea and menorrhagia
- Hyperthyroid women are more likely to experience hypomenorrhea compared with euthyroid women
Explain why hypothyroidism can lead to oligomenorrhoea
- Low T3 & T4 feed back to hypothalamus to increase TRH
- TRH increases TSH secretion but also increases prolactin secretion from AP
- Prolactin inhibits GnRH
- Less FSH and LH
- Less oestrogen
- Irregular ovulation or anovulation
- Oligomenorrhoea or amenorrhoea
What investigations would you consider for someone with oligomenorrhoea?
- Pregnancy test
- Blood tests
- TFTs
- Prolactin
- FSH, LH, testosterone, SHBG, oestradiol
- Ultrasound pelvis
- Progesterone challenge test
Explain how a progesterone challenge works
Give oral progesterone and see if elicits a withdrawal bleed
- A bleed suggests there are adequate levels of oestrogen but pt not ovulating
- No bleeds means there could be very low levels of oestrogen or outflow obstruction
What would the following hormone levels be like in hypothalamic, prolactinoma, PCOS and POF causes of oligomenorrhoea or amenorrhoea
Discuss the management of oligomenorrhoea
Management can be split into different categories:
-
Regulating periods:
- COCP
- IUS
-
Hormone replacement
- E.g. if POF should have cyclical hormone replacement with oestrogen (and progesterone if have uterus)
- Calcium & vit D following bone density scan
-
Symptom control
- Excessive hair growth PCOS: certain COCPs e.g. Yasmin
- Acne treatment in PCOS: e.g. benzoyl peroxide, retinoids etc….
-
Lifestyle advice
- If excessive exercise or eating disorders
- Some women with PCOS need support with healthy lifestyle (nutrition & exercise). May benefit from orlistat
-
Treat underlying disorder
- Hypothyroidism → levothyroxine
- Hyperthyroidism → carbimazole, radioactive iodine etc..
-
Improving fertility
- Clomifene (stimulate ovulation)
- Metformin can be used in PCOS to induce ovulation & treat insulin resistance
- IVF
-
Surgery
- Tx for pituitary tumours & genital tract abnormalities
What does hypomenorrhea mean?
Very light, sometimes scanty, periods
What is intermenstrual bleeding?
It is a _________?
- IMB is any bleeding that occurs between menstrual periods
- Red flag for cervical and other gynaecological cancers (although other causes more common)
State some potential causes of intermenstrual bleeding
- Hormonal contraception
- Cervical ectropion
- Cervical polyps
- Cervical cancer
- Endometrial polyps
- Endometrial cancer
- Vaginal pathology e.g. cancer
- Pregnancy
- Ovulation can cause spotting in some women
- Medications
- SSRIs
- Anticoagulants
What does dysmenorrhoea mean?
Painful periods
State some potential causes of dysmenorrhoea
- Primary dysmenorrhoea (no underlying pathology)
- Endometriosis
- Adenomyosis
- Fibroids
- Pelvic inflammatory disease
- Copper coil (IUD)
- Cervical cancer
- Ovarian cancer
What does metrorrhagia mean?
Menstruation at irregular intervals/variation in cycle length of more than 7/9 days (dependent on source)
What is meant by primary amenorrhoea?
Primary amenorrhoea is the failure to establish menstruation by 15 years of age in girls with normal secondary sexual characteristics (such as breast development), or by 13 years of age in girls with no secondary sexual characteristics.
State some potential causes of primary amenorrhoea, categorise into:
- Hypogonadotropic hypogonadism
- Hypergonadotropic hypogonadism
- Structural disorders
- Other hormonal disorders
Hypogonadotropic hypogonadism (abnormal functioning of hypothalamus or pituitary leading to deficiency of GnRH and/or LH/FSH which leads to deficiency of oestrogen):
- Constitutional delay in growth & development
- Kallman syndrome
- Hypothyroidism
- Hyperprolactinaemia
- Chronic conditions e.g. CF, IBD
- Excessive exercise or dieting
- Growth hormone deficiency
- Damage to hypothalamus or pituitary e.g. previous radiotherapy or surgery
Hypergonadotropic hypogonadism (abnormal functioning of gonads in which gonads fail to respond to gonadotrophins):
- Turner’s syndrome
- Congenital absence of ovaries
- Previous damage to ovaries (e.g. cancers, infection)
Structural disorders
- Imperforate hymen
- Transverse vaginal septum
- Vaginal agenesis
- Absent uterus
- FGM
(Mayer-Rokitansky-Kuster-Hauser syndrome – characterised by agenesis of the Mullerian-duct system in varying degrees. This translates to congenital absence of the uterus and upper two thirds of the vagina and therefore a cause of primary amenorrhoea)
Other hormone disorders
- Complete androgen insensitivity (46XY but defect in androgen receptor)
- Congenital adrenal hyperplasia
***More in menstrual disorders FCs
What is Kallman syndrome?
Kallmann syndrome is a condition characterized by delayed or absent puberty and a reduced or absent sense of smell (anosmia)
For congenital adrenal hyperplasia, discuss:
- What it is
- Inheritance pattern
- Pathophysiology
- Presentation in severe cases (focus on female only)
- Presentation in mild cases (focus on female only)
- Congenital deficiency in 21-hydroxylase enzyme (in small number of cases it is a deficiency of 11-beta-hydroxylase)
- Autosomal recessive
- 21-hydroxylase converts progesterone into aldosterone & cortisol. Deficiency of enzyme means there is extra progesterone in body that cannot be converted into aldosterone or cortisol hence it gets converted into testosterone (as progesterone is also used to create testosterone but this conversion doesn’t require enzyme 21-hydroxylase). Consequently, pt has low aldosterone, low cortisol & high testosterone
- Presentation in severe cases:
- Female pts have ambiguous genitalia & enlarged clitoris
- Biochemical abnormalities such as hyponatraemia, hyperkalaemia, hypoglycaemia which leads to:
- Poor feeding
- Vomiting
- Dehydration
- Arrhythmias
- Presentation in mild cases:
- Tall for their age
- Facial hair
- Absent periods
- Deep voice
- Early puberty
- Hyperpigmentation (increased ACTH in response to low cortisol; MSH is biproduct of ACTH production)
**SEE PAEDS ENDOCRINOLOGY FC FOR MORE
For complete androgen insensitivity syndrome, discuss:
- Inheritance pattern
- What it is
- Genotype & phenotype
- Presentation
- X-linked recessive
- Defect in androgen receptor so individual insensitive to testosterone
-
46XY but with female phenotype (female external genitalia, breast tissue)
- Absence of upper vagina, uterus, fallopian tubes, ovaries
- Testes in abdomen or inguinal canal
- Present with absent periods but with have female secondary sexual characteristics due to testosterone aromatising to oestrogen
For Turner’s syndrome, discuss:
- Genotype
- Presentation
- 45XO (missing a sex chromosome)
- Presentation:
- Late or incomplete puberty
- Short stature
- Webbed neck
- Broad/shield chest with widely spaced nipples
- High arching palate
- Cubitus valgus
- Most women are infertile
*SEE PAEDS DEVELOPMENT/ENDOCRINOLOGY FC FOR MORE INFO
What do we mean by imperforate hymen?
Hymen= thin layer of tissue located at opening of vagina
Lots of different types of hymen, but imperforate means there is not hole(s)/gap(s) in hymen so blood is unable to pass out of vagina during menstruation (lead to haematocolpos)
What do we mean by transverse vaginal septum?
Horizontal “wall” of tissue that has formed during embryologic development and essentially creates a blockage of the vagina (repro notes say due to failure of fusion of Mullerian ducts & urogenital sinus)
Discuss the threshold for investigations in pts presenting with primary amenorrhoea and discus what you would do prior to any investigations
Threshold is based on definition of primary amenorrhoea (and only investigate once fulfil this definition):
- No evidence of pubertal changes by 13yrs
- Some evidence of puberty/secondary sexual characteristics but no menses by 15yrs
Prior to any investigations:
- Detailed hx: general health, development, FH, diet, lifestyle
- Examination: height, weight, tanner stage, features of underlying conditions