Obs Physiology Flashcards
What crosses the placenta by facilitated diffusion?
Glucose
What crosses the placenta by active transport?
- AA
- Calcium
- Phosphorus
- Iron
What crosses the placenta by simple diffusion?
- O2
- CO2
- Electrolytes
- Ketones
What crosses the placenta by endocytosis?
IgG
What INCREASES in response to progesterone?
- Appetite
- RR
- Body Temp
- Nasal congestion
- LDL
- Depression
What DECREASES in response to progesterone?
- Tubal motility
- Lining of the uterus
- Ureteral motility
- Esophageal sphincter tone
- HDL
What are polypeptide hormones?
- PRL
- GH
- HPL/human chorionic somatommammotropin (produced by syncytiotrophoblast)
What are glycoprotein hormones?
- Thyrotropin
- FSH
- LH
- HCG (produced by syncytiotrophoblast)
- AFP
Things that don’t cross the placenta?
- T4, T3, TSH
- Insulin, glucagon
- Heparin
- Prednisone
Things that cross the placenta?
- PTU
- TRH
- Iodine
- MgSO4
- LATS
- IgG
- Propanolol
PaO2 levels in fetal circulation from highest to lowest
RA, LA, LV, RV
What are the 3 fetal shunts?
- Ductus venosus
- Foramen ovale
- Ductus arteriosus
What is the avg bispinous diameter?
10.5cm
What is the biggest diameter of the fetal head?
Supraoccipitomental
What is the diagonal conjugate?
Symphysis pubis to sacral promontory
Avg FL at term?
7.4cm
How to estimate GA using CRL?
CRL in cm + 6.5 = GA in weeks
ex. 3.5cm CRL+6.5 = 10 weeks
Which pelvic conjugate is clinical measurable?
The diagonal conjugate
What are the pelvic conjugates?
True conjugate, obstetric conjugate, diagonal conjugate
What is the avg BPD at term?
9.3 cm
What is the definition of engagement?
BPD passed the plane of the pelvic inlet OR the presenting part has reached the ischial spines
What are the 4 types of pelvises?
Gynecoid, anthropoid, android, platypoid
What are the characteristics of platypoid pelvis?
Flat oval, persistent transverse, increase in some oriental populations
What are the characteristics of gynecoid pelvis?
Round, “good” prognostically
What are the characteristics of anthropoid pelvis?
6 sacral segments, posterior inclination of sacrum, increased in african americans, increased OP
What decreases in pulmonary functions in pregnancy?
“Take the RV down to the ER for some TLC because its free”
RV, ERV, TLC, FRC
What increasees in pulmonary functions in pregnancy?
“I see the TV”
IC, TV
Minute ventilation
What doesn’t change in pulmonary functions in pregnancy?
VC
IRV
Pregnant vs non pregnant ABG?
pH/P02/PCO2/HCO3
Non pregnant: 7.4/93/35-40/24
Pregnant: 7.4/105/28-30/20
Respiratory alkalosis and metabolic acidosis
Blood volume at term?
approx 5 L
less ~1500 mls if preeclamptic
Total iron requirements in pregnancy
900-1000 mg (300mg fetus/placenta, 500mg for mother’s Hg, 200mg GI)
Daily caloric increase in pregnancy?
300kcals
Daily caloric increase for breastfeeding?
500kcal
