Flashcards in OB Week 1 Deck (80)
What is EDD?
Estimated date of delivery
What is EDC
Estimated date of confinement
How is the estimated date of a baby's birth is calculated from:
The 1st day of a baby's birth is calculated from the the 1st day of the woman's last normal menstual period.
-Subtract 3 months from first day of last LMP
-Add 7 days
-Correct the year if necessary
Any pregnacy loss before the 20th week or weighing less than 500 grams. Abortion can be either spontaneous" (SAB) or "therapeutic" TAB
A birth occurring between 34 0/7 weeks and 36 6/7 weeks of gestation (71% of all preterm births & about 12% of all births)
A birth occuring after the 42 nd week
Post term Birth
A birth occuring between 34 0/7 weeks and 36 6/7 weeks of gestation (71% of all preterm births & about 12% of all births.
The # of times a women has been pregnant (including this pregnancy), regardless of duration or outcome.
The # of pregnanies a women has completed past 20 week, regardless of whether infanct is born alive or dead. (refers to number of pregnancies not fetuses).
More complex method of describing "PARA"
Is often recorded in 4 numbers
The number of term deliversis (after 37 weeks)
The number of premature deliveries (> 20 and < 37 wk)
A= the number of abortions (either spontaneous or therapeutic)
L= the number of living children
A women who is pregnant for the 1st time
A women who has been pregnant more than once.
A women who has never completed a pregnancy past weeks 20 weeks.
A women who has given birth 2 or more times over 20 weeks of gestation.
A women giving birth for the first time of a pregnancy over 20 weeks gestatiion.
6-10" and 1" thick
1 lb to 1.5 lbs.
Divided into sections or segments called Cotyledons.
Placenta has two sides
- Fetal side- shiny and smooth in appearance, the amniotic sac is attached to it.
- Maternal side- dark red and rough in appearance.
Psysiology and functions of Placenta 1 A
Endocrine Gland: produces several hormones necessary for normal pregnancy
- HCG (human chorionic gonadotropin)
-Human Placental Lactogen
Pacenta also functions as 2 A:
Site of nutrient and O2 exchange and fetal waste excretion
-Occurs in the Intervillous space.
-About 150ml of the mother's blood is briefly outside of her circulatory system while it bathes the Chorionic Villi.
- These are "treelike" structures that are derived from fetal tissure.
-The blood is exchanged 3 to 4 times per minute in this space.
-Maternal and Fetal blood do not mix.
Placenta also function as 3 A.
-Blocks certain harmful substance- most Bacteria and some Viruses are too large to pass through the placenta.
-Maternal antibodies- many immunoglobulins are passesed to the fetus giving passive immunity to diseases, such as measles.
- Metabolic functions- substances are synthesized in the placenta (glycogen, cholesterol, fatty acids)
Umbilical Cord- 1 A
The lifeline between mother and fetus
-20" -22" long, 1 " thick.
Contains 3 vessels: 2 arteries and 1 vein, which are prtected by "wartons jelly".