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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