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Veterinary Emergency And Critical Care > Equations > Flashcards

Equations Flashcards

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Royal College: Emergency Medicine flashcards
1
Q

What is the equation of oxygen delivery

A

D02= CO x CaO2 (1.34xHbxSa02) + (0.003 x Pa02)

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2
Q

Poiseuilles equation

A

Delta P= 8uLQ/ pie r to the power of 4

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3
Q

La place

A

P= 2T/R

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4
Q

A-a gradient

A

PA02= (PB-Ph20) *Fi02 -(PaC02/RQ)

Shortened to
PA02= 150-(PaC02/0.8)

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5
Q

Equation for BP

A

BP= CO x SVR

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6
Q

Equation for MAP

A

MAP= DAP + (SAP-DAP)/3

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7
Q

Henry’s Law

A

V= S x P

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8
Q

Boyles Law

A

V1P1= V2P2

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9
Q

Ficks Law

A

J= k (c1-c2)
Where K= DxAxP/T

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10
Q

PPV equation

A

PPV (%)= 100 x (PPmax-PPmin)/ (PPmax + PPmin)/2)

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11
Q

Free water deficit

A

BW (kg) x {[Current Na/Normal NA] -1} x 0.6

= free water deficit in Litres

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12
Q

What is the calculation for compliance?

A

C= deltaV / delta P

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13
Q

Equation of motion

A

Pvent + pmuscles= elastance x volume + resistance x flow

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14
Q

What is the equation for fractional shortening?

A

FS (%) = LVIDd-LVIDs/ LVIDd x100

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15
Q

What is the equation for ejection fraction?

A

EF (%) = SV/ EDV x100

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16
Q

Map equation

A

MAP= DAP + [(SAP-DAP)/3]

17
Q

What is the calculation for free water deficit?

A

free water deficit (when NA too high)

FWD= 0.6 x BW(kg) x [(Na patient/Na normal) - 1]

Take normal sodium to be around 145

18
Q

Ohms law

A

Q= deltaP / R
Flow= change in pressure divided by resistance

19
Q

Reynolds number and it’s interpretation

A

Re= (D x p x V) / n

Reynolds number= (Diameter x density x velocity) divided by viscosity
< 2000 likely laminar flow
> 2000 likely turbulent flow

20
Q

Modified Bernoulli equation

A

Delta P= 4V squared
Change in pressure= 4 times velocity squared

21
Q

What is the equation for a shunt?

A

Qs/Qt= CcO2- CaO2/CcO2-CvO2

22
Q

Oxygen index equation

A

Mean airway pressure x FiO2 x 100/PaO2

23
Q

Oxygen saturation index

A

OSI= Mean airway pressure xFiO2 x 100/Sp02

Veterinary Emergency And Critical Care (25 decks)

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