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A. Apex Review > Calculations > Flashcards

Calculations Flashcards

1
Q

A-a Gradient

A

PAO2 - PaO2

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2
Q

Alveolar Gas Equation

A

PAO2 = FiO2 • (PATM - Pwater vapor) - PaCO2 / RQ

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3
Q

Dynamic Compliance (Cdyn) =

A

Tidal Volume /Peak Pressure - PEEP

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4
Q

Minute Ventilation =

A

RR * Tidal Volume

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5
Q

Predicted PaO2 by Age =

A

110- (Age *0.4)

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6
Q

Reynold’s Number =

A

(Velocity * Density * Diameter) / Viscosity

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7
Q

Static Compliance (Cstat) =

A

TV / (Plateau Pressure - PEEP)

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8
Q

Transpulmonary Pressure =

A

Alveolar Pressure - Pleural Pressure

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9
Q

Transthoracic Pressure =

A

Pleural Pressure - Atmospheric Pressure

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10
Q

Dead Space to Tidal Volume Ratio =

A

Vd/Vt Ratio = Vd / Vt

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11
Q

Cardiac Output =

A

HR x SV

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12
Q

Coronary Perfusion Pressure =

A

DBP - LVEDP (or PAOP)

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13
Q

Ejection Fraction =

A

EDV - ESV / EDV

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14
Q

Fick Principle

Cardiac Output =

A

(VO2 / CaO2 - CvO2) x 100

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15
Q

Law of LaPlace (Cylinder)

Wall Tension (cylinder) =

A

(Pressure x Radius) / Wall Thickness

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16
Q

Law of LaPlace (Sphere)

Wall Tension (Sphere) =

A

(Pressure x Radius) / 2 x Wall Thickness

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17
Q

Maximum Allowable Blood Loss =

A

EBV x (Starting Hgb - Target Hgb)/ Starting Hgb

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18
Q

MAP =

A

[SBP + (DBP * 2)] / 3

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19
Q

Oxygen Carrying Capacity / Oxygen Content

CaO2 =

A

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

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20
Q

Oxygen Delivery

DO2 =

A

(Hgb x SaO2 x 1.34) + (PaO2 x 0.003) x CO x 10

21
Q

Oxygen Extraction Ratio

ER =

A

Oxygen Consumption / Oxygen Delivery

22
Q

Poiseuille’s Law

Flow =

A

(π • Radius4 • ∆Pressure) /

8 • Viscosity • Length

23
Q

Pulmonary Vascular Resistance =

A

[ (Mean PA Pressure - PAOP) / CO ] x 80

24
Q

Pulse Pressure =

A

SBP - DBP

25
Q

Systemic Vascular Resistance =

A

[ (MAP - CVP) / CO ] x 80

26
Q

Stroke Volume (Version 1) =

A

CO x 1000 / HR

27
Q

Stroke Volume (Version 2) =

A

End Diastolic Vol - End Systolic Volume

28
Q

Uncuffed ETT size =

A

Age / 4 + 4

29
Q

Cuffed ETT size =

A

Age / 4 + 3.5

30
Q

O2 Remaining in Oxygen E-Cylinder:
Step 1
Step 2

A 
Step 1: 
Tank Capacity (L)/ Full Tank Pressure (psi) = Contents Remaining (L) = Gauge Pressure (psi)
Step 2:
Contents Remaining (L) / Flow Rate (L/min) = Minutes Left
31
Q

Fraction of Inspired Oxygen (FIO2) =

A

[ (Oxygen Flow Rate x 100) + (Air Flow Rate x 21) ] / Total Flow Rate

32
Q

Gas Tanks (E)

Air - Volume, Pressure, Pin

A

Air:

  • Vol: 660L
  • Pressure: 1900psig
  • Pin: 1-5
33
Q

Gas Tanks (E)

Oxygen- Volume, Pressure, Pin

A

Oxygen:

  • Vol: 660L
  • Pressure: 1900psig
  • Pin: 2-5
34
Q

Gas Tanks (E)

N2O- Volume, Pressure, Pin

A

N20:

  • Vol: 1590L
  • Pressure: 745psig
  • Pin: 3-5
35
Q

Cerebral Perfusion Pressure =

A

MAP - ICP (or CVP whichever is higher)

36
Q

Anion Gap =

A

[Na+] - ( [Cl-] + [HCO3-])

37
Q

Plasma Osmolarity =

A

2 [Na+] + Glucose/18 + BUN/2.8

38
Q

Boyle’s Law:

A

P1 x V1 = P2 x V2

39
Q

Gay Lussac’s Law:

A

P1/T1 = P2/T2

40
Q

Charles’ Law:

A

V1/T1 = V2/T2

41
Q

Ideal Gas Law:

A

Pressure x Volume = # moles x 0.0821 x temperature

42
Q

Celsius =

A

(F-32) x 5/9

43
Q

Dalton’s Law:

A

P total = P1+ P2 + P3 …

44
Q

Farenheit =

A

(C x 1.8) + 32

45
Q

Henderson Hasselbalch pH =

A

pK + log [HCO3 / (0.03 x PaCO2)]

46
Q

Henry’s Law =

A

Partial Pressure = Constant x Concentration

47
Q

Inverse Square Law

Intensity =

A

1 / Distance ^2

48
Q

Volume of Distribution =

A

Dose / Concentration

49
Q

Half Life =

A

Volume of Distribution / Rate of Clearance

A. Apex Review (4 decks)

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