Gynaecology Flashcards
(164 cards)
What is amenorrhoea
Absence of menstrual periods
What are the 2 types of amenorrhoea
Primary
Secondary
What is primary amenorrhoea
Failure to start having periods
- In presence of secondary sexual characteristics by 16+
- In absence of secondary sexual characteristics at 14-16
What is secondary amenorrhoea
Cessation of periods for over 6 months
After pregnancy has been excluded
What is oligomenorrhoea
Irregular periods
Menstrual cycle >35 days
<9 periods per year
What are the 4 groups of hypothalamic causes for amenorrhoea
- Reduced secretion of GnRH
- Functional disorders
- Severe chronic conditions
- Kallmann syndrome
Why is reduced secretion of GnRH a hypothalamic cause of amenorrhoea
Decreased pulsatile release of LH and FSH from anterior pituitary
Causes anovulation
What are the functional disorders that are hypothalamic causes of amenorrhoea
High levels of exercise
Eating disorders
Suppression of GnRH (due to ghrelin and leptin levels)
What are the severe chronic conditions that are hypothalamic causes of amenorrhoea
Psychiatric disorders
Thyroid disease
Sarcoidosis
What is Kallmann syndrome and how is it a hypothalamic cause of amenorrhoea
X-linked recessive disorder
Failure of migration of GnRH cells
What are the 5 pituitary causes of amenorrhoea
- Prolactinomas
- Other pituitary disorders
- Sheehan’s syndrome
- Destruction of pituitary gland
- Post-contraception amenorrhoea
What is a prolactinoma and how is it a pituitary cause of amenorrhoea
Pituitary tumour
Secretes high levels of prolactin (suppressing GnRH release)
Causes anovulation, amenorrhoea, and galactorrhoea
How do non-prolactinoma tumours of the pituitary cause amenorrhoea
Get gonadotropin deficiency from mass effect of tumour
What is Sheehan’s syndrome and how is it a pituitary cause of amenorrhoea
Post-partum pituitary necrosis
Due to massive obstetric haemorrhage
Get varying degrees of anterior pituitary hormone deficiency
What are the causes of pituitary gland destruction that can cause amenorrhoea
Radiation
Autoimmune disease
What is post-contraception amenorrhoea and how is it a pituitary cause of amenorrhoea
Due to prolonged use of contraceptives
Get downregulation of pituitary gland
Mostly seen in depo-provera (can take 18 months for periods to return)
What are the 3 ovarian causes of amenorrhoea
PCOS
Turner’s syndrome
Premature ovarian failure
How is PCOS an ovarian cause of amenorrhoea
Usually more associated with oligomenorrhoea
High androgen levels
Also get hirsutism, acne, and weight gain
What is Turner’s syndrome and how is it an ovarian cause of amenorrhoea
45 XO
Get amenorrhoea, but have secondary sexual characteristics
Almost universal infertility
Associated with short stature, webbed neck, aortic coarctation
What is primary ovarian failure and how is it a cause of amenorrhoea
Premature ovarian insufficiency before age 40
Get menopause symptoms
Have low oestrogen, high FSH
What is the adrenal gland cause of amenorrhoea
Late onset/mild congenital adrenal hyperplasia
What is late onset/mild congenital adrenal hyperplasia and how is it a cause of amenorrhoea
Partial deficiency of 21 hydroxylase (needed for cortisol and aldosterone production)
Presentation: early development of pubic hair, irregular/absent periods, hirsutism, acne
Have high levels of 17-hydroxyprogesterone in blood
What are the genital tract abnormalities that can cause amenorrhoea
Ashermann’s syndrome
Imperforate hymen/transverse vaginal septum
Mayer-Rokitansky-Kuster-Hauser syndrome
What is Ashermann’s syndrome and how is it a genital tract abnormality cause of amenorrhoea
Secondary to uterus instrumentation
Usually after surgical management of miscarriage
Have damage to basal layer of endometrium
Get intrauterine adhesions
Get failure to respond to oestrogen stimulus