SFP: alveolar ventilation Flashcards
How does tachypnea impact alveolar ventilation?
Can lead to hypoventilation due to not moving CO2 out properly.
What does bradypnea do to pressure in alveoli?
Increases it due to increased stretch from the higher volume with each slow breath.
What alveolar CO2 value is associated with hypoventilation in the alveolus?
Above 40.
What alveolar CO2 value is associated with hyperventilation in the alveolus?
Under 40.
What leads to respiratory acidosis? Why?
Hypoventilation; a buildup of CO2 reacts with water and carbonic acid is formed.
What is the equation for alveolar ventilation?
VA = (VCO2 x 0.863)/(PACO2).
What do the left and right x-axis represent on a flow volume loop?
TLC and RV respectively.
What is represented by the width of a flow volume loop?
FVC.
What is the basic definition of restrictive airways diseases?
Difficulty to inflate.
What is the basic definition of obstructive airway diseases?
Difficulty to exhale.
What does obstructive disease result in?
A very large residual volume due to not being able to get the air out and lower PEFR.
What does restrictive disease result in?
Lower total lung capacity.
In which respiratory disease type is the FEV/FVC ratio lower?
Obstructive; the ability to push air out, especially quickly, is lower.
What is FEV1?
The air you can force out in 1 second.
Describe capacity and FEV/FVC ratio in obstructive disease.
Same capacity due to preserved inhalation ability, but lower ratio due to impaired ability to exhale air.
