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Respiratory Part 7
Question | Answer |
---|---|
What happens to partial pressure of CO2 if you double Va per minute in the CO2 gas equation? | You halve partial pressure of CO2 |
Does giving someone oxygen have an effect on their CO2 expiration? | No! To get rid of CO2 you have to increase alveolar ventilation so patient can blow off CO2 being produced. |
What is the ideal partial pressure of CO2 and O2? | CO2=40mmHg and O2=100mmHg |
What is the ventilation of perfusion ratio? | Alveolar ventilation over pulmonary capillary blood flow |
What happens to PA of O2 and CO2 when there is low VA/Qc? | PA of O2 decreases and PA of CO2 increases, fall in PA O2 below 100mmHg |
What happens to PA of O2 and CO2 when there is high VA/Qc? | PA of O2 increases and PA of CO2 decreases. More fresh air into the lungs PA O2 increases above 100mmHg |
What is the maximum value of PA O2 if you maximally ventilate? | 130-135 |
How is the ventilation of perfusion ratio in obstructive and restrictive lung disease? | It is decreased in all pulmonary diseases |
What is the PA of O2 when VA/Qc= 0.8? | PA of O2 is 100mmHg |
What type of relationship does PaCO2 and VA per minute have graphically? | Hyperbolic. Therefore a decrease in VA from 4L/min to 3L/min will increase PaCO2 by 14mmHg and a decrease from 3L/min to 2L/min would increase PaCO2 by 29. |
What is the respiratory exchange ratio? | The ml of CO2 exchanged across the lung per minute over the ml of O2 exchanged across the lung per minute. It varies from 0.7 to 1 at rest. |
The respiratory exchange rate is equal to the respiratory quotient in the steady state. What is the respiratory quotient? | The ml of CO2 produced by the tissues per minute over the ml of O2 consumed by the tissues per minute. |
What is the RQ relative to carbohydrates? Proteins? Fats? | Carbohydrates=0.7, Proteins=0.8 and fats=0.7 |
Dissolved O2 | Only gases in solution exert a partial pressure. The relationship between PO2 and the concentration of dissolved O2 is direct and linear. |