Gyne Flashcards
(190 cards)
How you approach patient with PCOS
Clinically: (maybe asymptomatic)
Menstrual irregularities - Acne - Hirsutism - Alopecia - Acanthosis nigricans - Obesity
Lab tests:
High LH + Androgen + Glucose + Prolactin
Low SHBG
Imaging:
Multiple cysts
U/S criteria for PCOS
High number of follicles & amount of stroma compared with normal ovaries, resulting in an
increase in ovarian volume
8 or more subcapsular follicular cysts <10 mm in diameter
Pathophysiology of PCOS
High LH & Low FSH (ton steroids affect feedback or hypothalamus dysfunction) causes:
- High androgen from theca cells (may cause high estrogen)
- Lower SHBG
- Inhibit follicular growth
- Dyslipidemia (High TG & LDL and Low HDL)
- High Prolactin
High insulin causes:
- High androgen by ovaries
- Suppress SHBG production
يخلي المرأة عندها اعراض اندروجين هواي مع انه مستواهم طبيعي
- Anovulation
Obesity:
- Insuli resistance
- Lower SHBG
How you diagnose patient with PCOS
Patients must have two out of the three features below:
• Amenorrhoea/oligomenorrhoea
• Clinical or biochemical hyperandrogenism
• Polycystic ovaries on ultrasound
Sign of profound insulin resistance
Acanthosis nigricans (AN)
DDx of PCOS (androgen excess)
Cushing syndrome
CAH
Partial 21-Hydroxylase deficiency
Androgen secreting tumour (arrenoblastoma - Granulosa-theca cell tumor - lutoma of pregnancy)
Hyperthecosis
Acromegaly
chronic anovulation associated with (hypothalamic amenorrhea - emotional disorders - thyroid disorder)
Turner syndrome
How you distinguish between PCOS & Prolacinoma
positive response to a progestogen challenge test [e.g. medroxyprogesterone acetate 10 – 20 mg (depending on body weight) daily for 5 days], which induces a withdrawal bleed, will distinguish patients with PCOS - related hyperprolactinaemia from those with polycystic ovaries and unrelated hyperprolactinaemia
because the latter causes oestrogen deficiency and therefore failure to respond to the progestogen challenge
Relation between TSH & Prolactin
TSH may trigger prolactin secretion, when you study there’s no prolactin stimulating hormone only inhibiting.
Hypothyroidism = Infertility
DDx of High LH
POI
PCOS
AIS
How metformin affects PCOS
- Inhibits the production of hepatic glucose
- Enhances the sensitivity of peripheral tissue to insulin
- Ameliorate hyperandrogenism & abnormalities of gonadotrophin secretion
Remember/ There is no place for insulin -sensitizing agents (e.g. metformin) in the absence of impaired glucose tolerance
How Hyperandrogenesim is treated
Managed with Dianette, containing ethinyloestradiol in combination with
cyproterone acetate, or Yasmin, which contains drosperinone
Alternatives include spironolactone, and reliable contraception is required
Hirsutism & Virilisim
Hirsutism : increase in terminal hair on the face ,chest ,back and inner thighs in a women and the development of male escutcheon on the pubic hair(diamond , female is triangular).
It may be accompanied by anovulatory amenorrhoea, dysfunctional uterine bleeding ,or infertility.
Virilism : is development of hirsutism in addition to male features such as:
Deepining of the voice , frontal balding ,increased muscule mass , clitoromegaly , increased libido and may features of defeminisation, such as decreased breast size and loss of vaginal lubrication.
Causes of androgen excess
Hisutism and virilism are both a clinical manifestation of androgen excess.
The defect is either:
-Increase androgen production
-Increase androgen transport
-Increase target organ response
How you assess source of androgen
- Half of testosterone and androsteindione is produced by the ovary and other half from the adrenal.
- DHEA, DHEAS are mainly produced by the adrenal.
Note/ All preandrogen are converted in the liver to testosterone ,which is the main androgen
What are the drugs that cause androgen excess (Hirsutism)
Without virilization:
phenytoin, diazoxide ,ACTH ,coticosteroids.
With potential virilization:
progesterone, anabolic agent, androgen therapy.
Note/ Corticosteroid and androgen reduce SHBG so increase the free testosterone
Ovarian neoplasms that lead to Hirsutism
-Androgen secreting ovarian tumors are extremely uncommon (functional tumor) or other like cystadenoma or krukenberg’s tumor (non functional) will stimulate proiferation in adjecent ovarian stroma result in increase androgen production
-Arrenoblastoma or sertoli-leydig cell tumor (Palpable mass)
How you evaluate PCOS
History :
- Onset: sudden(neoplastic), gradual(PCOS)
- Symptoms of hirsutism and virilism
- Menstrual history: regular(ideopathic)
- Drug history
- Family history
Examination:
- Distribution of hair: (modified Ferriman and Gallway score) severity
- Body habitus and female contour
- Breast examination for atrophic changes
- Features of PCOS or cushing syndrome
- Pelvic examination to exclude ovarian tumor
Laboratory evaluation:
- Free testosterone(androgen excess) level >200ng/dl suggest adrenal neoplasm
-17 hydroxyprogesterone (CAH) and DHEAS (adrenal cause)
- LH:FSH ratio >3 indicate PCOS
Imaging:
- Pelvic ultrasound (ovarian tumor,PCOS)
- CT scan or MRI (adrenal and ovarian tumor)
- Dexamethasone suppression test if cushing syndrome is suspected(1mg ,8:00am cortiol level should be less than 5 microg/dl) if positive high dose test should be performed.
How you treat idiopathic Hirsutism
Cosmotic treament are:
- Temporary: Bleaching , shaving, chemical and wax depilators
- Perminant: electrolysis, laser
Note/ Medical treatment only after 👆🏻 failure
How COCP benefit PCOS Patients
- Decrease ovarian and adrenal production of steroids (androgen)
- Progesterone suppress LH reduce ovarian androgen synthesis
- Estrogen increase hepatic production of SHBG reduce free testosterone
- Estrogen decrease the conversion of testosterone to DHT in the skin by inhibiting the 5 alpha reductase
What is Dianette
- Cyproterone acetate: (treatment required for 24- 36 months)
Is synthetic progesterone acts by inhibiting androgen binding to the cytoplasmic receptors.
It cause irregular bleeding so it should be combined with ethinyl estradiol.
100mg for 10 days + Ethynil estradiol for 21 days
- Dianette is 30microgram ethinyl estradiol with 2mg cyproterone acetate
Spironolactone for Hirsutism
Spironolactone: diuretic , inhibits androgen biosynthesis and have anti androgen action in target cell
Dose is 25-100 mg daily
Note/ Flutamide not used due to liver toxicity
Why we use COCP with Cyproterone acetate or Spironolactone or finestride
Due to the risk of feminization in male fetuses if pregnancy occur
What are the anti androgens
CPA
Spironolactone
Ketoconazole (Steroidogenic enzyme inhibitor) :
- Reduce androgen when given in a low dose of 200 mg/day
Finasteride (5 alpha reductase inhibitor)
- 7.5 mg /day
What’s Climacteric or perimenopause
Time of until 1 year after the last period and the diagnosis of menopause is made