Cardio, renal, pulm equations

Question 1

π_BS

Answer 1

Usually equals zero

(shouldn’t have any protein in BS)

Question 1

HH equation

Answer 1

pH = 6.1 + log(HCO₃^-/0.03xP_CO2)

Question 2

CO x O₂ content =

Answer 2

O₂ delivery to tissues

Question 3

GFR x P_x =

Answer 3

Filtered load

Question 3

(Pc - PBS) - (πc - π_BS) =

Answer 3

Net filtration pressure (P_net)

Question 4

Clearance =

Answer 4

U_xV/P_x

Question 4

RPF/(1-HCT)=

Answer 4

RBF

Question 4

PVR =

Answer 4

P_{pulm artery}- P_LA

CO

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

Question 5

RPF =

Answer 5

U_PAH- V/P_PAH

Question 5

Excretion rate =

Answer 5

U_x x V

Question 5

Respiratory quotient =

Answer 5

CO₂ produced/O₂ consumed

Question 6

Hb x 1.34

Answer 6

Oxygen binding capacity

Question 7

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

Answer 7

MAP

Question 8

CO/SV

Answer 8

HR

Question 9

P_Ao2 =

Answer 9

~ 150 - Pa_CO2/0.8

P_I02 - (Pa_CO2/R)

Here, R is the respiratory quotient

Question 9

Net filtration pressure (P_net) =

Answer 9

(P_c - P_BS) - (π_c - π_BS)

Question 10

Accuracy of CRT as measurement of GFR?

Answer 10

Overestimates because CRT is slightly secreted

Question 12

LaPlace’s Law

Answer 12

Wall tension = Pressure x radius/2 x wall thickness

Question 13

Accuracy of PAH as measurement of RPF?

Answer 13

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

Question 13

(V_T - V_D) x RR =

Answer 13

V_A

Question 13

Oxygen content =

Answer 13

(O₂ binding capacity x O₂ sat) + dissolved O₂

Question 14

Rate of O₂ consumption

Arterial O₂ - Venous O₂

Answer 14

Cardiac output

(Fick principle)

Question 14

Use inulin or CRT clearance to estimate:

Answer 14

GFR

Question 15

Changes in CO in early vs. late exercise

Answer 15

Early = increase in HR and SV maintatin CO

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

Question 16

GFR =

Answer 16

U_inulin x V/P_inulin K_f[(P_c-P_BS) - (πc-π_BS)

Question 16

FF =

Answer 16

GFR/RPF

Question 18

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

Answer 18

Increases (R = viscosity x length/r⁴)

Question 19

Winter formula

Answer 19

Predicts respiratory compensation for metabolic acidosis P_CO2 = 1.5[HCO₃^-] + 8 +/- 2

Question 20

What happens to resistance to blood flow in larger vessels?

Answer 20

Decreases (R = viscosity x length/r⁴)

Question 21

VD =

Answer 21

V_T [Pa_CO2 - PE_CO2/Pa_CO2]

Question 22

P_{pulm artery} - P_LA/CO

Answer 22

PVR

Question 24

EDV-ESV/EDV

Answer 24

EF

Question 25

What is used to calculate GFR vs RPF?

Answer 25

GFR = inulin clearance R**P**F = **P**AH clearance

Question 26

6.1 + log(HCO₃^-/0.03xP_CO2) =

Answer 26

pH

Question 26

Net fluid flow (J) =

Answer 26

K_f(P_net)

Question 27

U_x x V =

Answer 27

Excretion rate

Question 28

V_T x RR =

Answer 28

V_E (mintue ventilation)

Question 30

EF =

Answer 30

SV/EDV EDV-ESV/EDV

Question 32

RBF =

Answer 32

RPF/(1-HCT)

Question 34

SV =

Answer 34

EDV - ESV

Question 36

EDV - ESV

Answer 36

SV

Question 37

Pulse pressue =

Answer 37

SBP - DBP

Question 39

MAP =

Answer 39

CO x TPR 2/3(DBP) + 1/3(SBP)

Question 40

O₂ binding capacity =

Answer 40

Hb x 1.34

Question 41

CO x TPR

Answer 41

MAP

Question 42

CO/HR

Answer 42

SV

Question 43

SBP - DBP =

Answer 43

PP

Question 45

QxR=

Answer 45

Change in pressure

Question 47

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

Answer 47

Winter formula P_CO2 = 1.5[HCO₃^-] + 8 +/- 2

Question 48

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

Answer 48

Oxygen content

Question 49

CO =

Answer 49

SV x HR

Question 50

Use PAH clearance to estimate:

Answer 50

RPF

Question 51

U_xV/P_x =

Answer 51

Clearance

Question 54

SV x HR

Answer 54

CO

Question 55

V_E =

Answer 55

V_T x RR

Question 56

VA =

Answer 56

(V_T - V_D) x RR

Question 57

150 - (Pa_CO2/0.8) =

Answer 57

Alveolar pressure of oxygen (P_Ao2)

Question 58

O₂ delivery to tissues =

Answer 58

CO x O₂ content

Question 59

Filtered load =

Answer 59

GFR x P_x

Question 60

P =

Answer 60

QxR

Question 61

SV/EDV

Answer 61

EF

Question 62

Wall tension=

Answer 62

Pressure x radius/2 x wall thickness (LaPlace's Law)

Question 63

GFR/RPF

Answer 63

FF