Maternal Physio - Hema and Immuno Flashcards Preview

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Flashcards in Maternal Physio - Hema and Immuno Deck (27):
1

Pregnancy is a state of ____ [hypo/hypervolemia]

Hypervolemia

2

Hypervolemia averages ___ percent above the nonpregnant blood volume after ___ weeks.

  • 40 to 45 percent
  • 32 to 34

 

Note:

  • This begins in the 1st trimester
  • Most rapid increase on 2nd trimester

 

Summary:

  • 12 weeks – 15%
  • 32 weeks – 40 to 45%

3

When does increase in blood volume begin? When is it fastest?

  • Begins in the 1st trimester
  • Most rapid increase on 2nd trimester

4

The rationale of hypervolemia

  1. To meet the metabolic demands of the enlarged uterus with its greatly hypertrophied vascular system
  2. To provide an abundance of nutrients and elements to support the rapidly growing placenta and fetus
  3. To protect the mother and in turn the fetus, against the deleterious effects of impaired venous return in the supine and erect positions
  4. To safeguard the mother against the adverse effects of blood loss associated with parturition

5

In hypervolemia, what blood components increase?

Plasma and erythrocytes but proportionately more plasma

6

Reflects ↑ erythrocyte production

↑ Reticulocyte count

7

What happens to hgb concentration and hct during pregnancy? What is mechanism?

They decrease; Because of great plasma augmentation

8

Normal hemoglobin level during pregnancy

12.5 g/dL

9

Abnormal levels of hgb per trimester

  • First
    • < 10 g/dl
  • Second
    • < 10.5 g/dl
  • Third
    • < 11 g/dl

 

Note: Anemia in pregnancy is defined as hgb < 11 g/dl

10

Define anemia of pregnancy

Levels below 11.0 g/dL

11

When does physiologic anemia of pregnancy occur?

T2

 

Note: This makes sense as hypervolemia happens fastest during the second trimester

12

What change happens to whole blood viscosity?

Decreased

 

Note: Makes sense because although both RBC and plasma increases, plasma increases more so the hgb, hct and viscosity is decreased

13

Iron requirements in normal pregnancy is about how much? Describe the appropriation.

  • 1000 mg/day
    • 300 mg are actively transferred to the fetus and placenta
    • 200 mg are lost
    • 500 mg due to increase in circulating erythrocytes

 

Summary: Most of the iron (50%) is used for hematopoiesis, especially in the last half of pregnancy

14

Normal estimated blood loss in:

  • Single NSD
  • Twin NSD
  • CS

  • Single NSD
    • 500 to 600 cc
  • Twin NSD
    • 1,000 cc
  • CS
    • 1,000 cc

15

T/F. Maternal blood volume ↑ more if having twins or higher order gestations as compared to singleton

True

16

Why is there a need for iron supplementation?

The amount of iron from the diet is insufficient to meet the needs of the pregnancy, so patients must take supplemental iron

17

Immunologic function during pregnancy (in general)

  • Suppression of humoral and cell-mediated immunological functions
    • Suppression of Th1 response is requisite for pregnancy continuation

18

Suppressed and upregulated immunologic activities

 

  • Suppressed activity
    • Decreased secretion of IL-2, interferon, and TNF-β
  • Upregulated activity
    • Increased secretion of IL-4, IL-6, IL-13
    • IgA and IgG in cervical mucus
    • IL-1B in cervical and vaginal mucus

19

Normal leukocyte count during normal pregnancy and labor

  • 5,000 to 12,000/μL (upper value up to 15,000/μL)
  • During labor and early puerperium > 25,000/μL

20

If WBC is elevated 24 hours after delivery, entertain what possible diagnosis?

Endometriosis

21

Markers of inflammatory states, when and how

  • Increased CRP throughout pregnancy
  • Increased ESR d/t elevated plasma globulins and fibrinogen
  • Increased C3 and C4 during the 2nd and 3rd trimester

22

Coagulation and fibrinolysis factors that increase during pregnancy

  • Fibrinogen
  • Factor VII
  • Factor X
  • Plasminogen

 

Note:

  • Fibrinogen
  • Factor VII
  • Factor X
  • Flasminogen

23

Hormone that causes an ↑ in clotting factors

Estrogen

24

Coagulation and fibrinolysis factors that decrease during pregnancy

  • aPTT
  • tPA
  • Antithrombin III
  • Protein C
  • Protein S
  • Platelet

 

Memory aid:

  • aPTT
  • tPA
  • Antithrombin III
  • Protein C
  • Protein S
  • Platelet

25

What happens to the platelet level during pregnancy? What is the mechanism?

  • Decreased (213,000/µL [non-pregnant 250,000])
  • Mechanism
    • Physiologic
      • possibly due to hemodilution
      • increased platelet consumption
      • production of thromboxane A2, which induces platelet aggregation

26

Platelet level returns to normal level when?

2 to 4 weeks postpartum

27

Thrombocytopenia platelet level

116,000/mL