Equations

Question 1

Minute ventillation

Answer 1

VT x frequency (breaths/min)

Question 2

VA (alveolar)

Answer 2

(VT-VD) x f

Question 3

Alveolar ventillation equation

Answer 3

VA=(VCO2 x K) / PACO2

Question 4

Alveolar gas equation

Answer 4

PAo2=Plo2 - PACO2/R + F

Question 5

Law of LaPlace

Answer 5

P (collapsing)=2T/r

Question 6

Airflow=

Answer 6

change in pressure/resistance

Question 7

Boyle’s Law

Answer 7

P1V1=P2V2

Question 8

Humidified gas

Answer 8

Px= (PB-PH20)xF

Question 9

Dry gas

Answer 9

Px=PB x F

Question 10

Fick’s Law

Answer 10

Vx=DA(change in P)/change in x

Question 11

Pressure transplural

Answer 11

Pressure alveolar - pressure interpleural = pressure lungs

Question 12

Pressure ip

Answer 12

=Pressure pleural

Question 13

Pressure chest wall

Answer 13

Pressure interpleural - Pressure atm

Question 14

V

Answer 14

Q/A

Question 15

Pdyn

Answer 15

(fluid density x v^2)/2

Question 16

Q

Answer 16

(pi(Pi-Po)r^4)/8nl

Question 17

R

Answer 17

=V voltage drop/I current flow = (Pi-Po)/Q = 8nl/pi^4

Question 18

Net filtration pressure

Answer 18

Pc + piIF - PIF -pic

Question 19

Series Rt

Answer 19

R1+R2+R3

Question 20

Parallel Rt

Answer 20

1/R1 + 1/R2 + 1/R3

Question 21

Reynold’s number Nr

Answer 21

densityDv/n

Question 22

Ex

Answer 22

(RT/(zxF))ln[(Xo/Xi)] = 61.5/zx x log[Xo/Xi]

Question 23

Em

Answer 23

(gk/gtotal)*Ek +…

Question 24

PP (pulse pressure)

Answer 24

Ps-Pd

Question 25

mean Pa

Answer 25

Pd+(Ps-Pd)/3

Question 26

dVa/dt

Answer 26

Qn-Qr

Question 27

Wall tension (T)

Answer 27

Ptransmural x r

Question 28

Cardiac output (CO)

Answer 28

HR x SV