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
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 R**P**F = **P**AH 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