Flashcards in Infertility and Assisted Conception Deck (21):
Briefly lis the stages involved in a treatment cycle of IVF
1. Down regulation
2. Ovarian stimulation
3. Egg collection and sperm sample
4. Embryo transfer
5. Luteal phase support via progesterone pessaries
Explain the down regulation stage of IVF.
Synthetic GnRH analogue (Buserelin) taken as a nasal spray or injection. This causes reversible down regulation so FSH and LH not produced. Taken for around 2 weeks
What two drugs are given to stimulate the ovaries in IVF?
Taken for around 12 days
What do Gonal F and Menopur cause?
What is the risk of giving menopur and gonal F?
Ovarian hyperstimulation syndrome
In the lead up to IVF when do you give an HCG injection and why?
Mimics spontaneous LH surge
Given 36 hours prior to egg collection
On average, how many cells does a human embryo have at day 2?
On average, how many cells does a human embryo have at day 3?
6 - 8
On what day approx does a morula form?
At what day should the embryo be an early blastocyst?
What is the best day for embryo transfer back into the women?
Day 5 blastocyst
Briefly describe the hormonal control of the menstrual cycle (starting from day 1)
1. At the start of the cycle oestrogen levels are low which causes an increase in GnRh and release of FSH by the anterior pituitary gland.
2. This causes follicular development in the ovary which also results in an increase in oestrogen production.
3. Initially this rising oestrogen level inhibits the release of LH but at a certain level it causes a surge of LH.
4. This LH surges causes ovulation (around 36 hours later)
5. At ovulation the dominant follicle is released into the ampulla of the fallopian tube.
6. The remaining part of the follicle become the corpus luteum with secretes progesterone which maintain the wall of the uterus which has been built up, in case of a pregnancy,
7. If no pregnancy occurs the levels of progesterone decrease and then uterus wall is shed (menstruation)
How long before the sample is taken is it recommended that men do not ejaculate for?
What four characteristics of the sperm are measured in a semen analysis?
Volume of ejaculate
Density (Numbers of sperm in ejaculate)
Motility (what proportion are moving)
Progression (how well they move)
What is the sign than the IVF laboratory looks for to demonstrate fertilisation?
What stage do you freeze embroys as?
What is the HEFA rules about how many embryos should be transferred into a women?
Under 40: No more than 2
Over 40: 3 may be transferred in exceptional circumstanced only.
How much folic acid should an otherwise healthy women take before getting pregnant and for how long?
0.4mg/day 3 months before and 3 months after pregnancy started
How long after embryo transfer would you do a pregnancy test?
How long after a positive pregnancy test in someone who has had IVF would you do a transvaginal US?