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# Respiratory Part 7

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.

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