Airway Flashcards
Compliance
C=V/P
Compliance (lung& thorax)
Clt= Vt/Paw
What is average lung/thorax compliance?
100 ml/cmh2o
Compliant lung is….
Less pressure needed to fill
Non compliant lung
More pressure required
Normal compliance values individually…
200 ml/cmH2O
Separate compliance equation
1/Clt = 1/Cl + 1/Ct
Flow equation (V with circle on top)
V = V/t
Normal VO2 flow is…
242 ml/min
Normal VCO2 flow for patient…
194 ml/min
VO2 flow equation
W^.75 x 10
Respiratory quotient equation
VCO2/VO2
Normal respiratory quotient is ???
.8
VCO2 equation…
VCO2 = VO2 x R
Minute ventilation definition.
Total V of gas or each minute.
Minute ventilation (Ve) equation
Ve= Vt x f
Ve= minute ventilation f = frequency Vt = tidal volume
What is normal water vapor pressure in a patient? At 37*C?
47 mmHg
Alveolar Ventilation definition
Total volume of gases flowing in/out of gas exchange each minute.
PaCO2 = Alveolar CO2 pressure, normal in pt?
40 mmHg (+/- 4mmHg)
Total gas in alveoli equation..
Ptot= Pbar
Pbar = ???
Bar pressure of atm (737) - Ph2o (47mmHg)
FiO2 equation?
O2 (L) + Air(L)(.21)/Total gas flow(L)
Anatomic Deadspace for each patient is related to…
2.2ml/kg or 1m/lb
Volume of anatomic deadspace equation =
VdAnat = VdAnat x f
Minute ventilation definition
Total gas moving in/out of lungs
Minute ventilation equation =
Ve= Va + VdAnat
FRC = ???
35ml/kg
Ideal body weight equations
Male - W = 50 + (H-60)x2.3
Female - W= 45.5 + (H-60)x2.3
BSA Equation
BSA = H^.725 + W^.425 x .007184
BMI Equation =
BMI= W/H^2
What are ranges for BMI?
18.5-25 = Normal >25-30 = Overweight >30-40 = Obese >40 = Morbidly Obese
Volume of a cylinder
V = pi x r^2 x h
Ohms Law
V=IR
V= Volt I= current (A) R= Resitance (Ohm)
Power equation
P = VxI
Watt
MAP
(2D + S) / 3
