Formulas For Intro I

Question 1

Ejection Fraction (EF)

Answer 1

Stroke Volume (SV) ÷ End Diastolic Volume (EDV)

Normal: ~65%

Question 2

Stroke Volume (SV)

Answer 2

End Diastolic Volume (EDV) - End Systolic Volume (ESV)

Normal value: ~70 ml

Question 3

Cardiac Output (CO)

Answer 3

Heart Rate (HR) x Stroke Volume (SV)

Normal value: 5 L/min
Range: 4 - 8 L/min

Question 4

Systemic Vascular Resistance (SVR)

Answer 4

(Mean Arterial Pressure - Central Venous Pressure) ÷ Cardiac Output

Normal values: 15 - 20 mmHg

Question 5

Pulmonary Vascular Resistance (PVR)

Answer 5

(Mean Pulmonary Artery Pressure - Left Arterial Pressure) ÷ Cardiac Output

Normal range: 1.7 - 2.0 mmHg

Question 6

MAP

Answer 6

(2xDiastolic + Systolic) ÷ 3

CO x SVR

Volume ÷ Capacity

Normal range: 80-100 mmHg

Question 7

Dynes resistance

Answer 7

SVR x 80

Question 8

Celsius

Answer 8

5/9 (F-32)

Question 9

Fahrenheit

Answer 9

(9/5 x C) + 32

Question 10

Resistance (R)

Answer 10

ΔP ÷ V̇

Question 11

Pressure (P)

Answer 11

height x density

2ST ÷ r

Question 12

Relative Humidity (RH)

Answer 12

absolute content ÷ capacity

Question 13

Body Humidity (BH)

Answer 13

absolute content ÷ 43.8

Question 14

Alveolar Air (PAO2)

Answer 14

FiO2(Pb-PH2O) - PaCO2÷0.8

Pb- barometric pressure; usually 760 mmHg unless otherwise statement
PH2O- water vapor pressure; 47 mmHg

Question 15

A-a Gradient

Answer 15

PAO2 - PaO2

normal value: 25 mmHg or less on room air

Question 16

A-a Ratio

Answer 16

PaO2 ÷ PAO2

normal value: 74%

Question 17

Total Oxygen Content (CaO2)

Answer 17

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

Question 18

Oxygen Delivery (DO2)

Answer 18

CaO2 x CO

Question 19

Compliance

Answer 19

ΔV ÷ ΔP

Question 20

Anatomic Dead Space Volume (VD)

Answer 20

1 ml x each lb of ideal body weight

Question 21

kg to lb

Answer 21

1 kg = 2.2 lb

Question 22

Dead Space Ratio (VD/VT)

Answer 22

(PaCO2 - PeCO2) ÷ PaCO2

norm: 30%

Question 23

Static Compliance (Cstat)

Answer 23

VT ÷ (Pplat - Peep)

normal value: 60 - 100 ml/cmH2O

Question 24

Dynamic Compliance (Cdyn)

Answer 24

VT ÷ (Pip - Peep)

Question 25

Minute Volume (V̇E)

Answer 25

VT x RR

norm : 5 - 10 L/min

Question 26

Alveolar Ventilation (VA)

Answer 26

VT - VD

Question 27

Alveolar Minute Ventilation (V̇A)

Answer 27

RR x (VT-VD)

Question 28

Dalton’s Partial Pressure Law

Answer 28

Ptot = P1 + P2 + P3 +….

Question 29

Boyle’s law

Answer 29

P1V1 = P2V2

Question 30

Charles’ Law

Answer 30

V1/T1 = V2/T2

Question 31

Gay Lussac’s Law

Answer 31

P1/T1 = P2/T2