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Step One R&M > Cardio, renal, pulm equations > Flashcards

Cardio, renal, pulm equations Flashcards

1
Q

πBS

A

Usually equals zero

(shouldn’t have any protein in BS)

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1
Q

HH equation

A

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

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2
Q

CO x O2 content =

A

O2 delivery to tissues

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3
Q

GFR x Px =

A

Filtered load

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3
Q

(Pc - PBS) - (πc - πBS) =

A

Net filtration pressure (Pnet)

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4
Q

Clearance =

A

UxV/Px

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4
Q

RPF/(1-HCT)=

A

RBF

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4
Q

PVR =

A

Ppulm artery- PLA

CO

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

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5
Q

RPF =

A

UPAH- V/PPAH

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5
Q

Excretion rate =

A

Ux x V

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5
Q

Respiratory quotient =

A

CO2 produced/O2 consumed

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6
Q

Hb x 1.34

A

Oxygen binding capacity

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7
Q

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

A

MAP

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8
Q

CO/SV

A

HR

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9
Q

PAo2 =

A

~ 150 - PaCO2/0.8

PI02 - (PaCO2/R)

Here, R is the respiratory quotient

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9
Q

Net filtration pressure (Pnet) =

A

(Pc - PBS) - (πc - πBS)

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10
Q

Accuracy of CRT as measurement of GFR?

A

Overestimates because CRT is slightly secreted

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12
Q

LaPlace’s Law

A

Wall tension = Pressure x radius/2 x wall thickness

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13
Q

Accuracy of PAH as measurement of RPF?

A

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

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13
Q

(VT - VD) x RR =

A

VA

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13
Q

Oxygen content =

A

(O2 binding capacity x O2 sat) + dissolved O2

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14
Q

Rate of O2 consumption

Arterial O2 - Venous O2

A

Cardiac output

(Fick principle)

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14
Q

Use inulin or CRT clearance to estimate:

A

GFR

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15
Q

Changes in CO in early vs. late exercise

A

Early = increase in HR and SV maintatin CO

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

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16
Q

GFR =

A

Uinulin x V/Pinulin

Kf[(Pc-PBS) - (πc-πBS)

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16
Q

FF =

A

GFR/RPF

18
Q

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

A

Increases

(R = viscosity x length/r4)

19
Q

Winter formula

A

Predicts respiratory compensation for metabolic acidosis

PCO2 = 1.5[HCO3-] + 8 +/- 2

20
Q

What happens to resistance to blood flow in larger vessels?

A

Decreases

(R = viscosity x length/r4)

21
Q

VD=

A

VT [PaCO2- PECO2/PaCO2]

22
Q

Ppulm artery- PLA/CO

A

PVR

24
Q

EDV-ESV/EDV

A

EF

25
Q

What is used to calculate GFR vs RPF?

A

GFR = inulin clearance

RPF = PAH clearance

26
Q

6.1 + log(HCO3-/0.03xPCO2) =

A

pH

26
Q

Net fluid flow (J) =

A

Kf(Pnet)

27
Q

Ux x V =

A

Excretion rate

28
Q

VT x RR =

A

VE (mintue ventilation)

30
Q

EF =

A

SV/EDV

EDV-ESV/EDV

32
Q

RBF =

A

RPF/(1-HCT)

34
Q

SV =

A

EDV - ESV

36
Q

EDV - ESV

A

SV

37
Q

Pulse pressue =

A

SBP - DBP

39
Q

MAP =

A

CO x TPR

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

40
Q

O2 binding capacity =

A

Hb x 1.34

41
Q

CO x TPR

A

MAP

42
Q

CO/HR

A

SV

43
Q

SBP - DBP =

A

PP

45
Q

QxR=

A

Change in pressure

47
Q

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

A

Winter formula

PCO2 = 1.5[HCO3-] + 8 +/- 2

48
Q

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

A

Oxygen content

49
Q

CO =

A

SV x HR

50
Q

Use PAH clearance to estimate:

A

RPF

51
Q

UxV/Px =

A

Clearance

54
Q

SV x HR

A

CO

55
Q

VE =

A

VT x RR

56
Q

VA=

A

(VT - VD) x RR

57
Q

150 - (PaCO2/0.8) =

A

Alveolar pressure of oxygen (PAo2)

58
Q

O2 delivery to tissues =

A

CO x O2 content

59
Q

Filtered load =

A

GFR x Px

60
Q

P =

A

QxR

61
Q

SV/EDV

A

EF

62
Q

Wall tension=

A

Pressure x radius/2 x wall thickness

(LaPlace’s Law)

63
Q

GFR/RPF

A

FF

Step One R&M (38 decks)

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