Maternal Physiology Flashcards

1
Q

The total body water ____________ during pregnancy.

A

increases (from 6.5 L to 8.5 L)

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2
Q

Why does the cardiac output increase during pregnancy?

A

There is hemodilution with physiologic anemia in the context of increased demand.

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3
Q

What is the normal range for pregnancy weight gain in women of normal prepregnancy weight?

A

25 - 35 lbs

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4
Q

Vascular resistance decreases in pregnancy due to ______________.

A

progesterone (as well as increased NO production by the placenta)

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5
Q

The placenta inactivates ____________.

A

ADH

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6
Q

Serum sodium usually ______________ during pregnancy.

A

drops by 3-4 mM

This occurs because water retention outpaces sodium retention in pregnancy.

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7
Q

The RAAS system ____________ during pregnancy.

A

increases

Note: the plasma volume increases by about 50% during pregnancy.

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8
Q

The HR increases by about __________ during pregnancy.

A

10 - 20 BPM

Note: SV also increases by about 20 mL per beat, so net CO increases.

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9
Q

The perfusion to the brain and liver does not usually increase with the increased CO found in pregnancy, but the perfusion to _________ does.

A

the uterus, skin, and breasts

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10
Q

What is the upper limit of normal HR in pregnancy?

A

100 BPM

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11
Q

Which heart murmur is found in almost 100% of pregnant women?

A

Systolic ejection murmur (also S3)

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12
Q

Overall, the cardiac changes seen in pregnancy mimic those of _______________.

A

congestive heart failure (e.g., orthopnea, edema, S3, increased HR, increased RAAS, and increased levels of BNP)

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13
Q

During labor, there is an increase of CO of about _________.

A

51%

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14
Q

Initially, the Valsalva maneuver __________ venous return.

A

decreases (because of increased intrathoracic pressure)

“Valsalva = VeinS ALl VAcant”

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15
Q

What amounts of blood loss are considered normal during delivery?

A

Vaginal delivery: 500 mL

Caesarean section: 1000 mL

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16
Q

The severity of aortic stenosis is determined by ________________.

A

pressure gradient across the aortic valve (mild = less than 36; moderate = 36 –63; severe = greater than 63)

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17
Q

What pulmonary changes occur during pregnancy?

A
  • Tidal volume increases
  • Progesterone increases sensitivity of the medullary respiratory center to CO2
  • Decreased residual volume (and thus decreased TLC)
  • Mild respiratory alkalosis develops
18
Q

Minute ventilation is equal to _________.

A

RR x TV

19
Q

During pregnancy, pCO2 _________.

A

decreases to 27 - 32 mmHg (compared to 40 mmHg normal)

Similarly, HCO3 decreases to maintain a normal pH.

20
Q

True or false: pCO2 decreases in pregnancy due to increased RR.

A

False. RR does not change during pregnancy. The decrease in pCO2 is due to increased TV.

21
Q

In terms of renal adaptation, there is a relative ____________ in pregnancy.

A

hydronephrosis

22
Q

The uterus is usually right-leaning, so ____________ more commonly arises in the right kidney.

A

pyelonephritis (due to urinary stasis)

23
Q

True or false: GFR usually decreases by 25% during pregnancy.

A

False. GFR increases by ~50% (to almost 200 mL/min).

24
Q

Creatinine and BUN usually _________ during pregnancy.

A

decrease

25
Q

What hematologic complications are often seen in pregnancy?

A

Dilutional anemia and thrombocytopenia

26
Q

Describe the changes to immune cells that occur in pregnancy.

A

WBCs increase to an average of 8,500 cells/mL. During labor, WBCs can increase to 30,000 even without infection!

27
Q

It’s thought that the increases in coagulation factors has evolved to _______________.

A

protect against hemorrhage

28
Q

List the coagulation factors and whether each increases, decreases, or stays the same.

A

Increase: I, II, V, VII, VIII, IX, X, XII
Stay constant: III, C (“C is Constant”)
Decreases: XI, XIII, S (“S Sinks”), TPA, TPAI

29
Q

Women with a history of DVTs and PEs should receive prophylactic ___________.

A

LMWH or unfractionated heparin

30
Q

How many more calories are needed during pregnancy?

A

First trimester: 200/day

Second and third trimesters: 300/day

31
Q

What GI complications are often found with pregnancy?

A
  • Decreased intestinal motility
  • Constipation and diarrhea
  • Hemorrhoids
  • Increased risk of gallstones
32
Q

Signs of liver disease, including ______________ are often normal in pregnancy.

A

decreased albumin, increased alkaline phosphatase, and spider angiomata

33
Q

Describe the two types of vomiting and nausea seen in pregnancis.

A
  • 70% of pregnancies: not serious; usually occurs between 4 weeks and 16 weeks and correlates with hCG
  • 1-3% of pregnancies: refractory nausea and vomiting that requires hospitalization (called hyperemesis gravidum)
34
Q

Hyperpigmentation of the nipples or face (called melasma) occurs due to _____________ and may be permanent.

A

hCG stimulating melanocyte-stimulating hormone

35
Q

Impaired volume expansion has been linked to what two disorders?

A

Preeclampsia and poor fetal growth

36
Q

Increases in BNP are seen predominantly during _____________.

A

the third trimester

37
Q

___________ can often be displaced to the left during pregnancy.

A

The PMI

38
Q

Which PFTs decrease during pregnancy?

A

RV, ERV, TLC, and FRC

39
Q

True or false: like COPD, FEV/FVC decreases during pregnancy.

A

False. FEV/FVC remains unchanged.

40
Q

What happens to FF during pregnancy?

A

It falls. Although GFR hugely increases, RBF increases even more.

41
Q

What is ptyalism?

A

Increased saliva production