Gynaecology Flashcards
(158 cards)
What are the CFs of PCOS?
- Menstrual irregularity - oligo/amenorrhoea
- Hyperandrogenism - acne, hirsuitism
- Anovulatory infertility - oligo/anovulation
- Increased risk of pregnancy complications eg. spont abortion, gestational diabetes, pre term labour
- Insulin resistance - obesity and T2DM, acanthosis nigricans
What is the theorised pathogenesis behind PCOS?
- Genetic link
- Increased LH and increased LH receptors = increased LH:FSH = excess androgen production
- Insulin resistance = hyperinsulinaemia to compensate for resistance, stimulates theca cells = increased androgen secretion
What are the stages of the menstrual cycle?
- Follicular phase
- Ovulation
- Luteal phase
- Secretory phase
Describe the pre ovulatory phase of the menstrual cycle
- Pulsatile GnRH causes FSH and LH release frm the ant pit
- Follicle grows due to FSH release
- LH releases androgen which is converted to oestrogen by aromatase = increased O
Describe how ovulation occurs
High levels of oestrogen act as positive feedback on FSH and LH - surge of LH causes ovulation, happens at Day 14.
What is the uterus doing around the time of ovulation?
From day 11-15 the uterus is preparing for implantation and fertilisation of the egg:
- Spiral arteries grow
- Endometrium thickens
- Cervical mucus thins to allow sperm to pass
What happens in the luteal phase?
Corpus luteum continues producing oestrogen but lutenised granulosa cells produce lots and lots of progesterone so it is the dominant hormone.
Progesterone and inhibin -ve feedback LH and FSH causing reduced oestrogen - this signifies ovulation has taken place.
What do high levels of progesterone do to the uterus?
Prepares the uterus to thick its cervical mucus = once oocyte fertilised don’t want to let any more sperm through and coil its spiral arteries = once oocyte is fertilised will implant.
What happens in the secretory phase/menstruation?
Corpus luteum changes to the corpus albican which is basically dead - no oestrogen or progesterone produced. Spiral arteries collapse and the lining sheds = menstruation.
What bloods are involved in ix PCOS?
- Total testosterone
- LH (often elevated)/FSH (elevated in premature ovarian failure, differential for PCOS)
- Prolactin - hyperprolactinaemia can cause oligomenorrhoea
- Thyroid profile - often causes irreg periods
- Free androgen index - if raised is diagnostic of PCOS
What is the Rotterdam criteria?
- Transvaginal USS reveals 12 or more cysts on one ovary or increased ovarian volume
- Oligo/anovulation
- Clinical or biochemical signs of hyperandrogenism
How do you treat menstrual irreg in PCOS? Why does it need treating?
Causes endometrial hyperplasia = possible increased risk endometrial cancer. Therapies prevent endometrial thickening.
- Cyclical progestogen
- COCP
- Levonorgestrel IUS = Mirena
What is PCOS?
Polycystic ovary syndrome: menstrual dysfunction and hyperandrogenism
What is the treatment of fertility in PCOS?
Induce normal ovulatory cycles:
- Letrozole - aromatase inhib
- Clomiphene - SERM, selective oestrogen receptor modulator
How do you treat the metabolic complications of PCOS?
- Weight loss can reduce metabolic risks and hyperandrogenism as well as restore ovulatory cycles
- Quit smoking
- Screen for diabetes, dyslipidaemia and HTN
- Metformin - used to be used but not routinely anymore
What are fibroids?
Uterine leiomyomas - benign monoclonal tumours of the smooth muscle cells of the uterine myometrium.
What is the classification of fibroids?
- Intramural - most
- Submucosal - growing into the uterine cavity, may protrude through the cervical os
- Subserosal - growing outwards from the uterus
What are the RF and protective factors of fibroids?
RF - obesity, early menarche, FH, HTN, alcohol consumption, poor diet
Protective - exercise, increased parity, cigarettes
What is the presentation of fibroids?
- Asymptomatic
- Excessive or prolonged heavy periods - Fe def anaemia
- Intermenstrual bleeding
- Compressive sx - pelvic pain, constipation, urinary sx
- Recurrent miscarriage or infertility
What do you find o/e of PCOS?
- Palpable abdo mass arising from pelvis
- Enlarged, irreg, firm, non tender uterus palpable on bimanual pelvic exam
- Signs of anaemia due to menorrhagia
What are the ix into fibroids?
- Pregnancy test
- FBC
- Transvaginal US or pelvic US
- MRI - only if US is not definitive
- Endo metrial sampling for histology
- Hysteroscopy w biopsy
What is the management of fibroids?
- NSAIDs - reduce menstrual blood loss when cause is unknown but less evidence in fibroids
- Tranexamic acid
- COCP or Levonorgestrel IUS
- Mifepristone = progesterone receptor inhib
- Ulipristal acetate
- Surgery
When is surgery indicated in fibroids? What surgery is done?
- Excessively enlarged uterine size
- Pressure sx
- Med management not controlling sx
- Reduced fertility
Surgery - myomectomy, hysteroscopic endometrial ablation, total hysterectomy
What is endometriosis?
Extrauterine implantation and growth of endometrial tissue. Deposits more freq on pelvic structures, most commonly the ovaries. Commonly causes pain but also may lead to reduced fertility and adhesion formation.