Gynaecology Flashcards
How long is a typical menstrual cycle?
23-35 days
What is the structure of the ovarian menstrual cycle?
Follicular (d1-13), ovulation (d14), luteal phase (d15-28)
What is the structure of the uterine menstrual cycle?
menses (d1-5, proliferative (d6-14), secretory (d15-28)
What happens in the follicular phase?
- Folliculogenesis
- Follicle maturation
- Thickening of the uterine lining
What happens in the luteal phase?
- Corpus luteum forms
- Increased progesterone
During the menses and follicular phase are the levels of oestrogen and progesterone high or low?
Low
During the proliferative phase and ovulation are the levels of oestrogen and progesterone high or low?
High oestrogen
What causes high oestrogen during ovulation?
LH surge on day 12-13, 36 hours pre-ovulation
During the luteal and secretory phase are oestrogen levels high or low?
high progesterone
What is the best marker of ovulation?
Mid-luteal progesterone levels (cycle length minus 7 days e.g. day 21)
What hormones are involved in the menstrual cycle and released by the pituitary?
LH, FSH
What is the role of oestrogen?
- Female body composition
- Builds up endometrium
- Improves bone mineral density
- Increases spiral arterioles
What is the role of progesterone?
- increase uterine mucus secretion
- maintains endometrial lining
- myometrium smooth muscle relaxation
What is the role of LH?
Acts on theca cells to produce oestrogen
What is the role of FSH?
Acts on granulosa cells for folliculogenesis
What needs to happen for the LH surge to occur?
An isolated raised oestrogen
What is primary amenorrhoea?
When a pt has never had a period either >13 with no primary sexual characteristics or >15 with no secondary sexual development
What is hypergonadotrophic amenorrhoea?
- Raised LH and FSH
- primarily in TURNERS (45X)
- Can be ovarian dysgenesis/agenesis
What is hypogonadotrophic amenorrhoea?
- Decreased LH and FSH
- primarily in Kallmann’s syndrome (+anosmia)
- Failure to thrive
- Androgen insensitivity syndrome
What is secondary amenorrhoea?
> 6 months of no periods in a normally menstruating female
What can cause secondary amenorrhoea?
- Sheehan’s syndrome (pituitary necrosis after PPH)
- Asherman’s syndrome (uterine adhesions post surgery)
- Eating disorders
- Hyperthyroid
- Hyperprolactinaemia
- PCOS
- Pregnant?
- Pre menopause?
How is amenorrhoea diagnosed?
- History and examination
- Bloods- oest, prog, test, FSH, LH, prolactin, SHBG, TPT, IGF1
- HbA1C (PCOS)
- Urine bHCG (pregnant?)
How is amenorrhoea treated?
- Hypogonadotrophic = COCP
- Hypergonadotrophic = GnRH analogue
- Refer to secondary care to treat underlying cause
What is a bicornate uterus?
Congenital defect, heart shaped uterus
- Increases risk of miscarriage + intra uterine growth restriction