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18 Cards in this Set
- Front
- Back
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Respiratory Quotient =
Carb Fat Protein Avg Diet |
RQ = CO2 produced/O2 consumed
Carb = 1.0 Fat = 0.7 Protein = 0.8 Avg Diet = 0.8 |
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Fick's Law
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Vx = DxAxΔP / ΔX
Use for determining diffusion/time Vx = volume of gas transferred/unit time D = diffusion coefficient A = SA ΔP = partial pressure difference of the gas ΔX = membrane thickness |
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IC =
FRC = VC = TLC = |
IC = VT + IRV
FRC = ERV + RV VC = IC + ERV TLC = VC + RV |
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Normal RV/TLC Ratio?
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Less than or equal to: 0.25
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Physiological Dead Space Vd?
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anatomical ds + functional ds
normal = anatomical only Vd = Vt x [PaCO2 - PECO2 / PaCO2] Anatomical dead space = persons weight if 150 pounds = 150ml |
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Minute Ventilation
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minute ventilation = Vt x breaths/min
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Alveolar ventilation Va
2 equations |
Correct of dead space =
VA = (Vt-Vd) x breaths/minute OR VA= VCO2 x K / PACO2 |
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Forced Expiratory Volume/ Forced Vital Capacity
FEV1/FVC Normal? |
FEV1/FVC = fraction of VC expired in 1 second
Normal = 0.8 |
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Transmural Pressure
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TP = alveolar P - intrapleural P
+TP = open -TP = collapse |
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Compliance
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C = ΔV/ΔP
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Laplace's Law
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P = 2T/r
P = collapsing pressure T = surface tension r = radius of alveolus |
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Airflow Resistance
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Q = ΔP/R
R = ΔP/Q |
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Poiseuille's Law
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R = 8nL/pi x r4
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DLCO
2 Equations (diffusing capacity of CO) Normal? |
DLCO = VCO/P1-P2
OR DLCO = VCO/PACO Normal = 20-30 ml/min/mmHg |
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Dalton's Law
Use when? 2 equations |
Partial pressures of gas
Px=Pb x F Humidified gases: Px = (Pb - PH2O) x F F = 0.21 PH2O= 47 F changes is supplemental O2 is used or breathing an oxygen-depleted atmosphere |
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Normal V/Q?
Ventilation/Perfusion Ratio |
Normal = 0.8
means alveolar ventilation - 80% pulmonary blood flow |
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A-a gradient
2 equations |
A-a = PAO2 - PaO2
A-a = [PIO2 - PACO2/RQ] - PaO2 |
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Henry's Law/ concentration of dissolved gas
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Cx = Px x Solubility
Px= partial pressure of gas solubility is a constant = 0.003 for O2 |
