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VTS (ECC) Prep 2023 > Misc Equations > Flashcards

Misc Equations Flashcards

1
Q

Transudate

A

TP= <2.5

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2
Q

Modified Transudate

A

TP= 2.5-5.0

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3
Q

Exudate

A

TP= > 5.0

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4
Q

Shock Index

A

HR/Systolic BP
>0.9: moderate to severe shock

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5
Q

O2 Extraction Ratio

A

VO2/DO2

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6
Q

Arterial Oxygen Content

A

CaO2=
(Hb X 1.3 X SaO2) + (PaO2 X 0.003)

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7
Q

Albumin Deficit

A

10( desired Alb- Pt Alb) X Wt X 0.3

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8
Q

Vertebral Heart Size

A

Short Axis + Long Axis
Dog: <10.7
Cat: <8.0

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9
Q

Laplac’s Law

A

Wall Stress= (Pressure X Radius)/ 2(Wall Thickness)

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10
Q

Starling’s Forces

A

Describes fluid movement between blood and tissues. Movement is determined by difference in hydrostatic and osmotic pressures between plasma inside micro vessels and fluid outside of the them (interstitial).

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11
Q

A-a Gradient

A

FiO2 (Atmospheric Pressure-47) - (PaCO2/0.8)-PaO2

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12
Q

Venous Admixture (shunt) Calculation

A

Qs/Qt= (CcO2 - CaO2)/ (CcO2 - CvO2)

CcO2= capillary O2 content
CvO2=central venous oxygen saturation

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13
Q

Alveolar Ventilation

A

VA= (VT-VD) X RR

= Tidal Volume-
Anatomical Dead Space
X RR

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14
Q

Compliance

A

change in volume for the amount of pressure applied

C= 🔺V/🔺P

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15
Q

Osmolality

A

2(Na) + (Gluc/18) + (BUN/2.8)

Use when concerned for HHS/hyperosmolar condition

Normal= 300ish

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16
Q

Effective Osmolality

A

2(Na) + (Gluc/18)

BUN not effective osmole

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17
Q

Corrected Na

A

1.6 ( Measured BG- Normal BG/100) + Measured Na

Used in hyperglycemia
Hyperglycemia can cause pseudohyponatremia

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18
Q

Corrected Chloride

A

(Normal Na/Measured Na) X Measured Cl

Used in hypernatremia

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19
Q

Free Water Deficit

A

[(Measured Na/Normal Na) -1] X TBW

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20
Q

Na Deficit

A

(Target Na- Patient Na) X TBW

21
Q

Strong Ion Difference

A

[Strong Cations] - [Strong Anions]

(Na + Mg + K + Ca) - (Cl + Lactate + Urate)

Simplified –> (Na) - (Cl)

22
Q

Strong Ion Gap

A

Dog: (alb X 4.9) - Anion Gap
Cat: (alb X 7.4) - Anion Gap

23
Q

Sodium Bicarbonate Supplementation

A

Base Excess X kg X 0.3

24
Q

Total Body Water

A

(0.6)(Kg)

25
Q

Base Deficit Calculation

A

Normal HCO3- Measured HCO3

26
Q

Anion Gap

A

(Na + K) - (HCO3+ Cl)

Generally should be less than 20
High AG = Metabolic Acidosis
DKA
Uremia
Ethylene Glycol
Lactic Acidosis
(aspirin, ethanol and propylene glycol too)

27
Q

Corrected Ca

A

0.8(Normal Alb- Pt Alb) + Measured Ca

28
Q

Lactate Effect

A

Measured Lax X -1

29
Q

Albumin effect

A

(Normal Alb- Measured Alb) X 4

30
Q

Albumin Deficit

A

10 (Target Alb- Pt Alb) X kg X 0.3

31
Q

Phosphate Effect

A

(Normal Phos- Measured Phos)/2

32
Q

Rehydration Volume

A

kg X % Dehyd (decimal) X 1000

33
Q

Coronary Perfusion Pressure

A

Diastolic Pressure - Pulm Capillary Wedge Pressure

34
Q

Pulse Pressure

A

Systolic - Diastolic

35
Q

Cardiac Output

A

SV X HR

36
Q

Stroke Volume Index

A

Stroke Volume/ Body Surface Area

37
Q

Fick’s Equation

A

CO= VO2/ (CaO2-CvO2)

38
Q

Normal CVP

A

0-5 cm H2O

39
Q

MAP

A

DP + (SP-DP/3)

40
Q

Systemic Vascular ResistancE

A

(MAP- Right Atrium Pressure)/Cardiac Index

41
Q

Cardiac Index

A

CO/Body Surface Area

42
Q

Shock Index

A

HR/Systolic

43
Q

Oxygen Delivery Equation

A

CaO2 X CO

44
Q

O2 Extraction Ratio

A

VO2/DO2

45
Q

Cerebral Perfusion Pressure

A

MAP-ICP

46
Q

PaO2/FiO2

A

PaO2 should be 5X FiO2
Normal: >400
Severe Hypoxemia/Defect: <300
ARDS: <200

47
Q

A-a Gradient

A

FiO2( Patm-47)-(PaCO2/0.8) - PaO2
Normal: 0-10, below 25
ARDS: 31 or greater

48
Q

Arterial Oxygen Content

A

CaO2= (1.34 X Hb X SaO2) +
(PaO2 X 0.003)

49
Q

Bicarbonate Supplementation

A

(HCO3 Goal- Measured HCO3) X 0.3 X kg

HCO3 Goal- Measured&raquo_space; Base Excess

VTS (ECC) Prep 2023 (4 decks)

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