Contraception Flashcards
(26 cards)
Hypothalamus releases which hormone:
Gonadotropin releasing hormone
GTRH sends a signal to the anterior pituitary to release:
Follicular stimulating hormone and luteinizing hormone
FSH stimulates
immature ovarian follicles, one becoming an ovum along with secondary follicles (granulosa cells)
Granulosa cells begin producing
estrogen
Estrogen from the granulosa cells prohibit the pituitary gland from producing
FSH
The follicle that produces the most estrogen becomes the
Ovum (sometimes two ovum are produced)
Estrogen will stimulate the development of the ____ and ____ cervical mucous
Endometrium; thin
Luteinizing hormone spikes day 14 and causes
The ovum to be released (ovulation)
Luteinizing hormone changes the granulosa cells into luteal cells which is now called the:
Corpus luteum
Corpus luteum produces
Some estrogen, relaxin, and large amounts of progresterone
Progesterone works by
maintaining endometrium
If fertilization does not occur, the corpus luteum becomes the corpus
albicans. Progesterone production drops and the endometrium sloughs
How do combination oral contraception prevent pregnancy?
Steady levels of estrogen and/or progesterone cause a negative feedback loop to the pituitary gland and prevent release of LH and FSH (causing ovulation)
*Levels of progesterone trick the body into thinking its already pregnant, thicken the cervical mucous which prevents sperm from entering uterus.
Systemic effects of estrogen
Positive effects on bone mass, triglycerides, HDL-to-LDL ratio, stimulation of coagulation and fibrinolytic pathways
Systemic effects of progesterone
Increase body temperature and insulin levels. Depress CNS
What are the two estrogen formulations available in contraception preparations?
Ethinyl estradiol and mestranol
Estrogen contraindications
Migraine with aura, uncontrolled HTN, postpartum <3 weeks and breastfeeding, history of DVT, smoking in women over age 35
Describe monophasic, biphasic, and triphasic dosing
Monophasic: same dose of estrogen and progestin for full cycle.
Biphasic: vary dose of progestin, no variation in estrogen dose
Triphasic: vary dose of estrogen, progestin, or both (not used as much)
Which medication can decrease efficacy of oral contraceptives?
Rifampin and Rifabutin
Plan B contains only:
Progestin
Plan B must be taken within ___ hours for it to be effective
72
Plan B is less effective is BMI is >___
- Serum doses are lower than normal weight
The emergency contraception Ella can be taken up to __ days after unprotected intercourse and be used in individuals whose BMI is
5;35
Copper IUD can be used as EC up to __ days after unprotected intercourse
7