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OB Anesthesia > Maternal Physiology > Flashcards

Maternal Physiology Flashcards

1
Q

By what percentage does cardiac output increase by 3rd trimester?

A

50%

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2
Q

What percentage doe stroke volume contribute to increase CO in pregnancy?

A

30%

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3
Q

What percentage does HR contribute to increased CO in pregnancy?

A

15%

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4
Q

By what percent does CO increase during active labor?

A

30%

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5
Q

By what percent does CO increase during 2nd stage labor?

A

45%

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6
Q

By what percent is CO increased during immediate post-partum?

A

80%

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7
Q

By what percent does blood volume increase during pregnancy?

A

35%

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8
Q

Are there changes to CVP or PCWP during pregnancy?

A

Noq

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9
Q

BY what % does MV increase by term?

A

50%

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10
Q

What is the predominant factor for increase MV?

A

Increased TV

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11
Q

Which FRC volumes decrease in pregnancy?

A

RV and ERV

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12
Q

How does IRV change with pregnancy?

A

Slight increase

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13
Q

What lung volumes remain unchanged in pregnancy?

A

TLC and VC

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14
Q

By what % does FRC change in sitting position?

A

20% decrease

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15
Q

What causes LES tone to be lower in pregnancy?

A

Increased progesterone

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16
Q

By what % does red cell mass increase in pregnancy?

A

20%

17
Q

By what % does plasma volume increase in pregnancy?

A

45%

18
Q

Normal HCT by 3rd trimester?

A

35%

19
Q

Leading cause of mortality in pregnant patients globally?

A

PE

20
Q

Which coag factors increase during pregnancy?

A

I, VII, VIII, IX, X, XII

21
Q

Which coag factors remain unchanged during pregnancy?

A

II and V

22
Q

Which coag factors decrease during pregnancy?

A

XI, XIII

23
Q

What happens to plasminogen levels during pregnancy?

A

Increased

24
Q

By what % does MAC value decrease in pregnancy?

A

30-40%

25
Q

By what percent does local anesthetic requirements decrease during pregnancy?

A

30%

26
Q

Normal serum creatinine level in pregnancy?

A

0.5-0.6

27
Q

How is the bohr effect related to maternal fetal oxygen transfer?

A

Fetus transfer H+ ions to mother and in turns becomes more alkalotic while mom becomes acidotic. Creates left shift OHDC in fetus and right shift OHDS in mom

28
Q

Normal fetal PO2?

A

50-60 mmHg

29
Q

What is a normal umbilical artery gas and a normal umbilical vein gas?

A

https://creogsovercoffee.com/notes/2019/10/27/espresso-cord-gas-interpretation

30
Q

What is the umbilical vein gas reflective of?

A

Maternal/Placental side

OB Anesthesia (6 decks)

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