equations

Question 1

Alveolar Air equation

Answer 1

PAO2 = FiO2(PB-PBH20) - PaCO2/.8

Question 2

Calculate CaO2

Answer 2

(Hgb x 1.34 x SaO2) + (PaO2 x 0.0031)
Volume %

take out to 2 decimals

Question 3

how is HGB calculated?

Answer 3

Gram percent
Grams of HGB in 100 mL of blood

Question 4

Volume percent

Answer 4

volume of solute/volume of solution

Question 5

CvO2

Answer 5

(HGB x 1.34 x SvO2) + (PvO2 x 0.0031)

take out to 2 decimals

Question 6

C(a-v)O2

Answer 6

CaO2 - CvO2

should be about 5%

Question 7

Oxygen delivery

Answer 7

DO2

CaO2 x CO x 10

mL per minute

Question 8

oxygen uptake

Answer 8

VO2 = DO2 (from heart) - DO2(from tissues)

Question 9

venous admixture

Answer 9

Qs/Qt

(CcO2 -CaO2) / (CcO2 - CvO2)

expressed in percent, whole number

Question 10

CcO2

Answer 10

(HGB x 1.34 x SAO2) + (PAO2 x 0.0031)

Question 11

mean systemic arterial pressure

Answer 11

(systolic + (2 x diastolic))/3
whole numbers

Question 12

ventilation perfusion ratio

Answer 12

Alveolar ventilation (L) / Cardiac output (L)
Normal is 0.8-1.0

Question 13

VD/DT ratio

Answer 13

(PaCO2 - PeCO2) / PACO2

Question 14

P/F ratio

Answer 14

PaO2/FiO2
Normal 400-500

Question 15

equation of motion

Answer 15

P(mus) + P (aw) = Pe + Pr

Question 16

Charles law

Answer 16

V1/T1 = V2/T2
Pressure constant

Question 17

Gay-lusac law

Answer 17

P1/T1=P2/T2
Volume is constant

Question 18

combined ideal gas law

Answer 18

P=nRT/V
P = pressure
N =number of molecules
R = a constant
V = volume

Question 19

modified ideal gas law

Answer 19

P1xV1/T1 = P2V2/T2

Question 20

ficks law

Answer 20

V(gas) = A/T x D(gas)(P1-P2)
Vgas = volume of gas diffusing across a membrane
A = surface area tension
T = thickness
Dgas = diffusibility constant
P1-P2 = prcessure gradient

Question 21

Laplace law for sphere

Answer 21

P = 2T/r
P = distending pressure
T = tension creating tendency to collapse
r = radius

Question 22

Frank starling law

Answer 22

J = K(Pc-Pi) - (3.14c - 3.14i)
J = net fluid movement out of capillary
K = capillary ability to leak water
Pc = hydrostatic pressure in capillary
Pi = hydrostatic pressure in interstitium
3.14c = oncotic press in capillary
3.14i = oncotic pressure in interstitium

Question 23

Driving force for gas

Answer 23

F = NvA/Z
F = force
N = viscousity
v =velocity
A = cross sectional area
Z = distance between plates

Question 24

Reynolds number

Answer 24

Re = vrp/N
v = velocity
R = radius
p = density
N = viscousity

Question 25

poiseuille equation

Answer 25

V = deltaPr^4 / 8ni
V = flow
deltaP = pressure gradient
R = radius
n = viscousity
L =length

Question 26

ohms law

Answer 26

ohm = voltage/amps

Question 27

Predicted body weight formula