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Flashcards in Cardio, renal, pulm equations Deck (63):
1

πBS

Usually equals zero

 

(shouldn't have any protein in BS)

1

HH equation

pH = 6.1 + log(HCO3-/0.03xPCO2)

2

CO x O2 content =

O2 delivery to tissues

3

GFR x Px =

Filtered load

3

(Pc - PBS) - (πc - πBS) =

Net filtration pressure (Pnet)

4

Clearance =

UxV/Px

4

RPF/(1-HCT)=

RBF

4

PVR =

Ppulm artery - PLA

--------------------------------

CO

 

 

(b/c R = change in P/Q)

5

RPF =

UPAH - V/PPAH

5

Excretion rate =

Ux x V

5

Respiratory quotient =

CO2 produced/O2 consumed

6

Hb x 1.34

Oxygen binding capacity

7

2/3(DBP) + 1/3(SBP)

MAP

8

CO/SV

HR

9

PAo2 = 

~ 150 - PaCO2/0.8

 

PI02 - (PaCO2/R)

 

Here, R is the respiratory quotient

9

Net filtration pressure (Pnet) =

(Pc - PBS) - (πc - πBS)

10

Accuracy of CRT as measurement of GFR?

Overestimates because CRT is slightly secreted

12

LaPlace's Law

Wall tension = Pressure x radius/2 x wall thickness

13

Accuracy of PAH as measurement of RPF?

Underestimates by ~10% b/c not 100% is excreted

13

(VT - VD) x RR =

VA

13

Oxygen content =

(O2 binding capacity x O2 sat) + dissolved O2

14

Rate of O2 consumption

-----------------------------------------------------------

Arterial O2 - Venous O2

Cardiac output

 

(Fick principle)

14

Use inulin or CRT clearance to estimate:

GFR

15

Changes in CO in early vs. late exercise

Early = increase in HR and SV maintatin CO

 

Late = only increase in HR maintains CO b/c SV plateaus

16

GFR =

Uinulin x V/Pinulin

 

Kf[(Pc-PBS) - (πc-πBS)

16

FF =

GFR/RPF

18

What happens to resistance as the length of the vessel increases?

Increases

 

(R = viscosity x length/r4)

19

Winter formula

Predicts respiratory compensation for metabolic acidosis

 

PCO2 = 1.5[HCO3-] + 8 +/- 2

20

What happens to resistance to blood flow in larger vessels?

Decreases

 

(R = viscosity x length/r4)

21

VD =

VT [PaCO2 - PECO2/PaCO2]

22

Ppulm artery - PLA/CO

PVR

24

EDV-ESV/EDV

EF

25

What is used to calculate GFR vs RPF?

GFR = inulin clearance

RPF = PAH clearance

26

6.1 + log(HCO3-/0.03xPCO2) =

pH

26

Net fluid flow (J) =

Kf(Pnet)

27

Ux x V =

Excretion rate

28

VT x RR = 

VE (mintue ventilation)

30

EF =

SV/EDV

 

EDV-ESV/EDV

32

RBF =

RPF/(1-HCT)

34

SV =

EDV - ESV

36

EDV - ESV

SV

37

Pulse pressue =

SBP - DBP

39

MAP =

CO x TPR

 

2/3(DBP) + 1/3(SBP)

40

O2 binding capacity =

Hb x 1.34

41

CO x TPR

MAP

42

CO/HR

SV

43

SBP - DBP =

PP

45

QxR=

Change in pressure

47

How can you know if a patient is adequately compensating for metabolic acidosis?

Winter formula

 

PCO2 = 1.5[HCO3-] + 8 +/- 2

48

)O2 binding capacity x O2 sat) + dissolved O2 =

Oxygen content

49

CO =

SV x HR

50

Use PAH clearance to estimate:

RPF

51

UxV/Px =

Clearance

54

SV x HR

CO

55

VE =

VT x RR

56

VA =

(VT - VD) x RR

57

150 - (PaCO2/0.8) =

Alveolar pressure of oxygen (PAo2)

58

O2 delivery to tissues =

CO x O2 content

59

Filtered load =

GFR x Px

60

P =

QxR

61

SV/EDV

EF

62

Wall tension=

Pressure x radius/2 x wall thickness

 

(LaPlace's Law)

63

GFR/RPF

FF