OB 1 Kenobi Flashcards
Define an embryo
Fertilization –> 8th week
Define a fetus
9th week –> birth
Define preterm infant
Born prior to 37 weeks gestation
Define neonate
Live born birth –> 28 days old
Define an infant
Live born birth –> 1 year old
Define post-term infant
Live born birth AFTER 42 weeks gestation
(perinatal mortality (death of fetus or neonate) increases as gestation advances beyond due date)
What is Nagele’s rule?
Used to calculate Expected Date of Confinement (EDC)
- Add 7 days to LMP
- Subtract 3 months
How is gestational age calculated?
Age of fetus calculated from 1st day of LMP
(includes 2 weeks when woman is not pregnant)
How is Fetal age calculated?
Age of fetus calculated from time of implantation
(2 weeks less than gestational age) = actual fetus age
In which trimester is the fetus most sensitive to teratogens?
1st trimester
Define 1st trimester
1 - 12 weeks (12 weeks)
Define 2nd trimester
13 - 28 weeks (16 weeks)
Define 3rd trimester
29-40 weeks (12 weeks)
What happens to Tidal Volume, PO2, Expiratory Reserve, and PCO2 in pregnancy?
↑ TV & PO2
↓ Exp Reserve & PCO2
What happens to CO, SV, and systemic vascular resistance in pregnancy?
↑ CO & SV
↓ SVR
What happens to gastric motility, gallbladder empyting, GFR, plasma volume, and WBCs in pregnancy?
↓ gastric motility & delayed gallbladder emptying
↑ GFR, plasma volume, WBCs
How much folic acid supplementation is needed for low risk vs. high risk?
Most prenatal vitamins contain how much folic acid?
- Low risk: 0.4 mg
- High risk: 4 mg
- Vitamins: 1 mg