WVSOM -- Respiratory Physiology Equations
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Physiologic Dead Space | Vd = Vt X (PAco2 - PEco2)/PAco2
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| minute ventilation | Tv X bpm
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| Alveolar ventilation | (Tv-Deadspace) x bpm
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| Dead Space | Vt X (PAco2-PEco2 / PAco2)
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| Normal value of FEV1/FVC | 0.8
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| Total Lung Capacity | Sum of all 4 lung volumes
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| compliance | volume/pressure
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| Airflow | Q=P/R
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| Poiseuille's law | R= 8nl/(pi)r4
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| Asthma FEV | decreased
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| COPD FEV1 | decreased
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| Fibrosis FEV | slightly decreased
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| Asma FVC | slightly decreased
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| COPD FVC | slightlly decreased
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| Fibrosis FVC | Greatly decreased
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| FEV1/FVC asthma | decreased
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| COPD FEV/FVC | drecreased
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| Fibrosis FEV/FVC | normal or increased
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| FRC asthma | increased
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| FRC COPD | increased
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| FRC Fibrosis | decreased
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| Partial Pressure | Total Pressure X Fractional gas concentration
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| Fractional Gas concentration of O2 | 0.21
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| partial pressure of h2o | 47 mmHg
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| Partial pressure of Po2 in trachea | 150
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| PO2 of dry air | 160
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| Po2 of alvolar air | 100
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| PO2 of arterial blood | 100
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| PO2 of venous blood | 40
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| Pco2 of arterial blood | 40
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| Pco2 of venous blood | 46
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| Pco2 of dry inspired air | 0
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| O2 percentage in air | 21
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| CO2 percentage in air | 0.03
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| Percentage of N2 | 79%
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| Pulmonary Vascular Resistance | (Pa – Pv)/flow rate
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| The laboratory provides the following report on arterial blood from a patient: PCO2 32 mmHg, pH 7.25, HCO3- concentration 25 mmol/liter. | pH = 6.1 + log [HCO3-]/[CO2] = 6.1 + log (25/0.03 x 32)
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| alveolar gas equation | PAO2 = PIO2 – (PACO2/R)
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Created by:
tjamrose
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