Emergency Contraception and Abortion Flashcards
(20 cards)
What is emergency contraception?
Broad term to describe drug of device used to prevent pregnancy after unprotected sexual intercourse
Two progestogen only plan B types
- Plan B: two 0.75 mg doses 12 hours apart
- Plan B One-Step: one 1.5 mg dose
Effectiveness of emergency contraception pill
- 61-95%
- If taken within 24 hours it is 95% effective
- If taken between 48 and 72 hours it is 61% effective
Which hormones do they assay for determining the timing of ovulation?
- LH
- Estradiol (E2)
- Progesterone (P4)
What is a transvaginal ultrasound examining to determine cycle timing?
- Follicle dimensions
- Endometrial appearance
Average follicle ruptures at what size?
20 mm in diameter
What is the probability of clinical pregnancy 5 days before day of ovulation?
4% (0.04)
What is the probability of clinical pregnancy 3 days before day of ovulation?
8% (0.08)
What is the probability of clinical pregnancy 4 days before day of ovulation?
13% (0.13)
What is the probability of clinical pregnancy 2 days before day of ovulation?
29% (0.29)
What is the probability of clinical pregnancy 1 day before day of ovulation?
27% (0.27)
How does LNG-EC (morning after pill) play a role in pre-fertilization events?
- Prevent follicle maturation and/or ovulation by suppressing LH and FSH and/or LH surge.
- Single dose effects cervical mucous and sperm motility for 24 hours.
What is the probability of clinical pregnancy on the day of ovulation?
8% (0.8)
How does “morning after” pill impact post-fertilization events?
- Short answer: it doesn’t
- Does not increase ectopic pregnancy, embryo movement, and will not harm existing pregnancy.
How many days after unprotected intercourse should an IUD be placed to act as emergency contraception?
Within 5 days
Are you less likely to get pregnant if you take emergency contraceptive before or after ovulation?
Before
Mechanism of action of IUD as emergency contraception during follicular phase
May immobilize sperm or prevent their migration to the oviduct to prevent fertilization
Mechanism of action of IUD as emergency contraception during luteal phase
- Creates inflammatory reaction in endometrium
- Copper is embryotoxic
Is the hormonal or non-hormonal IUD more effective as emergency contraceptive?
Equally
Yuzpe regimen
Morning after pill with combined progestogen and estrogen
