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Board Review 2020 > Equations to know > Flashcards

Equations to know Flashcards

1
Q

Fractional excretion (use Na as example but anything can be used) calculation

A

(UNa x PCr)/ (PNa x UCr) x 100

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2
Q

Renal clearance calculation

A

[Urine] x Urine flow rate / [Plasma]
Top should be in mg/min
Creatinine generally equals GFR

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3
Q

Renal blood flow calculation

A

Renal plasma flow / (1-HCT)

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4
Q

Filtration fraction calculation

A

GFR/ Renal plasma flow

Normal 20%

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5
Q

Excretion rate calculation

A

urine flow rate x [urine]

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6
Q

Reabsorption rate calculation

A

filtered load- excretion rate

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7
Q

filtered load calculation

A

GFR x [plasma]

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8
Q

secretion rate calculation

A

Excretion rate-filtered load

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9
Q

Protein requirements in dogs/cats

A

dog 4-5 g/ 100 Kcal

Cat 6-8 g/ 100 kcal

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10
Q

Fick’s law of gas diffusion

A

Volume of gas per unit time= area/ thickness x Diffusion constant x partial pressure difference

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11
Q

Calculate PAO2

A

FiO2 (PB - 47) - PaCO2/0.8
Generally considered at sea level and room air to be
150- PaCO2/0.8

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12
Q

Calculate A-a gradient

A

Should be done on room air
PAO2-PaO2
Normal < 15
> 15 implies V/Q mistmach

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13
Q

Calculate PF ration

A 
Can be done with any FiO2
PaO2/Fio2 (decimal)
Normal 5x FiO2--- 500 
<300 vet ALI
< 200 Vet ARDS
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14
Q

Calculate the shunt equation

A

Qs/Qt= (CcO2-CaO2) / (CcO2-CmvO2)

Normal < 5%

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15
Q

Calculate physiologic dead space

Bohr equation

A

Vd/Vt= (PaCO2- PETCO2)/PaCO2

<40% is normal with spontaneous breathing

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16
Q

What is lapace law

A

Pressure= (2 x wall thickness) / radius

17
Q

Modified bernouli equation

A

Change in pressure= 4 x Velocity ^2

18
Q

What is ohms law

A

Flow= change in pressure/ resistance

19
Q

What is Poiseuilles law for flow

A

Flow= (Pi x pressure x radius^4)/ 8 x viscosisityx length

20
Q

What is Poiseuilles law for resistance to flow

A

Resistance to flow = (8xviscosityx length) / (pi x radius^4)

21
Q

Calculate Arterial oxygen content

A

CaO2= (Hgb x 1.34 x SaO2) + (PaO2 x 0.003)

22
Q

Calculate oxygen delivery

A

DO2= cardiac output x CaO2

Normal 20-35 ml/kg/ min

23
Q

Calculate oxygen consumption

A

VO2= CO x (CaO2 - CmvO2)

Normal 4-11 ml/kg/ min

24
Q

Calculate oxygen extraction ratio

A

OER= (CaO2-CmvO2)/CaO2

Normal 20-30 %

25
Q

Calculate systemic vascular resistance

A

(MAP-CVP)/ CO

Can put Cardiac index in for CO

26
Q

Calculate pulmonary vascular resistance

A

PVR= (PAP-PAOP)/ CO

Normal 0.04-0.06

27
Q

Calculate mean arterial pressure

A

[(Systolic-diastolic)/3] + Diasotolic

28
Q

What is the fick principle for calculating CO

A

CO= VO2/ (CaO2-CmvO2)

29
Q

Calculate cerebral perfusion pressure

A

CPP= MAP- ICP

30
Q

Calculate coronary perfusion pressure

A

diastolic aortic pressure- right atrial pressure

31
Q

What are the normal circulating pressures in the heart

A 
RA: Mean 5 mmHg
RV: 25/5
PA: 25/10
LA: 5-10 mmHg
LV: 125/10
Aortic: 125/80
32
Q

Calculate albumin deficit

A

grams= 3 x Kg x (desired albumin- actual albumin)

33
Q

How much albumin is in FFP, whole blood and HSA`

A

FFP: 3 g/100 ml
Whole: 1.4 g/ 100 ml
HSA: 25 g/ 100 ml

34
Q

Calculate pulse pressure

A

systolic- diastolic

changes with age

35
Q

Calculate pulse pressure variation

A

When mecahnically venitilated
(PPmax - PP min)/ PP Mean = expressed as percentage
Max- inspiration, Min- expiration

36
Q

Starling equation

A

Jv= K( Pc-Pi) - o ( Oncotic C - Oncotic Inter)
K= filtration coeffic
o= reflection coefficitient
P- hydrostatic pressure

37
Q

Calculate shock index

A

Hr/ SBP
> 0.9-1 clinical diagnosis of shock
Not validated

38
Q

Calculate a blood transfusion

A

Transfusion Amount for RBCS = [(PCV desired – PCV actual/PCV of donor/unit] x Body weight (kg) x blood volume

estimate 65% for Packed red cells if not labeled
Blood volume Dog 88 ml/kg Cats 66 ml/kg

Board Review 2020 (37 decks)

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