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25 Cards in this Set

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PP(dry)=
Fractional conc. X barametric Pressure
PP(inspired
Fractional conc. X (barametric Pressure-47)
minute ventilation
(VE or VT)=
VA+VD
Anatomic Dead Space
VD=
VE-VA
Alveolar Ventalation
VA=
VE-VD
Respiratory Echange Ratio
(R)=
VCO2 200
---- = ------ = 0.8
VO2 250
What is the anatomic dead space (VD)?
What is it's fxs? (2)
conducting zone (prox to bronchioles)
1)conduit 2) conditions air
define physio dead space?


equasion (VD)=
everything NOT available for gas exchange (anatomic dead space + alveolar dead space)
VD+AD
Bohr equasion for calculating physiologic dead space =
VT (PaCO2-PECO2/PaCO2)

aka percentage of arterial CO2 not exhaled multiplied by tidal volume
an increase in alv ventilation (VA) leads to a _____ in alv ____
increase / PO2
more similar to inspired air
a decreases in alv ventilation (VA) leads to a _____ in alv ____
decrease / PCO2
(more similar to vv blood)
alv gas equasion
PAO2 =

if R=0.8 PAO2 =
PIO2 - (PACO2/R) + F


PIO2-1.25 PACO2
Fick equasion for diffusion across alv- cap membranes

V(gas)=
DAalpha (∆P/∆X)
diffusion limited gas xchange across alv-cap membranes
CO2, O2 (abnormal conditions)
perfusion limited gas xchange across alv-cap membranes
O2 (normal conditions), N2O
Diffusing capacity (DL)=
DAalpha Vgas
------- = -------
∆X PAgas-Pcgas
Factors which decrease lungs diffusiong capacity (4)
1) decrease pulm. cap. BF
2) decrease bl Hgb
3) decrease A
4) increase membrane thickness (∆X)
4
forms O2 is transported in bl
1) plasma (dissovled)
2)Hgb
O2 capacity =
1.39 X [HGB]
O2 sat =
O2+ Hgb
----------- x 100%
O2 capacity
a decreases in alv ventilation (VA) leads to a _____ in alv ____
decrease / PCO2
(more similar to vv blood)
alv gas equasion
PAO2 =

if R=0.8 PAO2 =
PIO2 - (PACO2/R) + F


PIO2-1.25 PACO2
Fick equasion for diffusion across alv- cap membranes

V(gas)=
DAalpha (∆P/∆X)
diffusion limited gas xchange across alv-cap membranes
CO2, O2 (abnormal conditions)
perfusion limited gas xchange across alv-cap membranes
O2 (normal conditions), N2O