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Obstetrics > Obs Physiology > Flashcards

Obs Physiology Flashcards

1
Q

What crosses the placenta by facilitated diffusion?

A

Glucose

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2
Q

What crosses the placenta by active transport?

A
  • AA
  • Calcium
  • Phosphorus
  • Iron
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3
Q

What crosses the placenta by simple diffusion?

A
  • O2
  • CO2
  • Electrolytes
  • Ketones
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4
Q

What crosses the placenta by endocytosis?

A

IgG

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5
Q

What INCREASES in response to progesterone?

A
  • Appetite
  • RR
  • Body Temp
  • Nasal congestion
  • LDL
  • Depression
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6
Q

What DECREASES in response to progesterone?

A
  • Tubal motility
  • Lining of the uterus
  • Ureteral motility
  • Esophageal sphincter tone
  • HDL
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7
Q

What are polypeptide hormones?

A
  • PRL
  • GH
  • HPL/human chorionic somatommammotropin (produced by syncytiotrophoblast)
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8
Q

What are glycoprotein hormones?

A
  • Thyrotropin
  • FSH
  • LH
  • HCG (produced by syncytiotrophoblast)
  • AFP
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9
Q

Things that don’t cross the placenta?

A
  • T4, T3, TSH
  • Insulin, glucagon
  • Heparin
  • Prednisone
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10
Q

Things that cross the placenta?

A
  • PTU
  • TRH
  • Iodine
  • MgSO4
  • LATS
  • IgG
  • Propanolol
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11
Q

PaO2 levels in fetal circulation from highest to lowest

A

RA, LA, LV, RV

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12
Q

What are the 3 fetal shunts?

A
  • Ductus venosus
  • Foramen ovale
  • Ductus arteriosus
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13
Q

What is the avg bispinous diameter?

A

10.5cm

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14
Q

What is the biggest diameter of the fetal head?

A

Supraoccipitomental

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15
Q

What is the diagonal conjugate?

A

Symphysis pubis to sacral promontory

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16
Q

Avg FL at term?

A

7.4cm

17
Q

How to estimate GA using CRL?

A

CRL in cm + 6.5 = GA in weeks

ex. 3.5cm CRL+6.5 = 10 weeks

18
Q

Which pelvic conjugate is clinical measurable?

A

The diagonal conjugate

19
Q

What are the pelvic conjugates?

A

True conjugate, obstetric conjugate, diagonal conjugate

20
Q

What is the avg BPD at term?

A

9.3 cm

21
Q

What is the definition of engagement?

A

BPD passed the plane of the pelvic inlet OR the presenting part has reached the ischial spines

22
Q

What are the 4 types of pelvises?

A

Gynecoid, anthropoid, android, platypoid

23
Q

What are the characteristics of platypoid pelvis?

A

Flat oval, persistent transverse, increase in some oriental populations

24
Q

What are the characteristics of gynecoid pelvis?

A

Round, “good” prognostically

25
Q

What are the characteristics of anthropoid pelvis?

A

6 sacral segments, posterior inclination of sacrum, increased in african americans, increased OP

26
Q

What decreases in pulmonary functions in pregnancy?

A

“Take the RV down to the ER for some TLC because its free”

RV, ERV, TLC, FRC

27
Q

What increasees in pulmonary functions in pregnancy?

A

“I see the TV”
IC, TV
Minute ventilation

28
Q

What doesn’t change in pulmonary functions in pregnancy?

A

VC

IRV

29
Q

Pregnant vs non pregnant ABG?

A

pH/P02/PCO2/HCO3
Non pregnant: 7.4/93/35-40/24
Pregnant: 7.4/105/28-30/20
Respiratory alkalosis and metabolic acidosis

30
Q

Blood volume at term?

A

approx 5 L

less ~1500 mls if preeclamptic

31
Q

Total iron requirements in pregnancy

A

900-1000 mg (300mg fetus/placenta, 500mg for mother’s Hg, 200mg GI)

32
Q

Daily caloric increase in pregnancy?

A

300kcals

33
Q

Daily caloric increase for breastfeeding?

A

500kcal

Obstetrics (6 decks)

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