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25 Cards in this Set
- Front
- Back
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PP(dry)=
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Fractional conc. X barametric Pressure
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PP(inspired
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Fractional conc. X (barametric Pressure-47)
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minute ventilation
(VE or VT)= |
VA+VD
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Anatomic Dead Space
VD= |
VE-VA
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Alveolar Ventalation
VA= |
VE-VD
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Respiratory Echange Ratio
(R)= |
VCO2 200
---- = ------ = 0.8 VO2 250 |
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What is the anatomic dead space (VD)?
What is it's fxs? (2) |
conducting zone (prox to bronchioles)
1)conduit 2) conditions air |
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define physio dead space?
equasion (VD)= |
everything NOT available for gas exchange (anatomic dead space + alveolar dead space)
VD+AD |
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Bohr equasion for calculating physiologic dead space =
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VT (PaCO2-PECO2/PaCO2)
aka percentage of arterial CO2 not exhaled multiplied by tidal volume |
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an increase in alv ventilation (VA) leads to a _____ in alv ____
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increase / PO2
more similar to inspired air |
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a decreases in alv ventilation (VA) leads to a _____ in alv ____
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decrease / PCO2
(more similar to vv blood) |
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alv gas equasion
PAO2 = if R=0.8 PAO2 = |
PIO2 - (PACO2/R) + F
PIO2-1.25 PACO2 |
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Fick equasion for diffusion across alv- cap membranes
V(gas)= |
DAalpha (∆P/∆X)
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diffusion limited gas xchange across alv-cap membranes
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CO2, O2 (abnormal conditions)
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perfusion limited gas xchange across alv-cap membranes
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O2 (normal conditions), N2O
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Diffusing capacity (DL)=
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DAalpha Vgas
------- = ------- ∆X PAgas-Pcgas |
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Factors which decrease lungs diffusiong capacity (4)
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1) decrease pulm. cap. BF
2) decrease bl Hgb 3) decrease A 4) increase membrane thickness (∆X) 4 |
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forms O2 is transported in bl
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1) plasma (dissovled)
2)Hgb |
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O2 capacity =
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1.39 X [HGB]
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O2 sat =
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O2+ Hgb
----------- x 100% O2 capacity |
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a decreases in alv ventilation (VA) leads to a _____ in alv ____
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decrease / PCO2
(more similar to vv blood) |
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alv gas equasion
PAO2 = if R=0.8 PAO2 = |
PIO2 - (PACO2/R) + F
PIO2-1.25 PACO2 |
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Fick equasion for diffusion across alv- cap membranes
V(gas)= |
DAalpha (∆P/∆X)
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diffusion limited gas xchange across alv-cap membranes
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CO2, O2 (abnormal conditions)
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perfusion limited gas xchange across alv-cap membranes
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O2 (normal conditions), N2O
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