Lung Volumes Flashcards
1
Q
Restrictive lung disease
A
lung can’t expand as much as it should
2
Q
Obstructive lung disease
A
huge increase in residual volume, air is trapped here - can’t breath out as easily
3
Q
What is the FEV1/FVC ratio
A
fraction of total FVC that can be expelled during the first second, reflects the resistance to airflow
4
Q
What is a normal FEV1/FVC
A
~0.8
5
Q
What is a FEV1/FVC that would be indicative of obstructive lung diseases
A
<0.7
6
Q
What is a FEV1/FVC that would be indicative of restrictive lung diseases
A
> 0.8
7
Q
What is the alveolar ventilation
A
rate at which new air reaches the gas exchange areas of the lungs
8
Q
How do you calculate alveolar ventilation
A
respiration rate x (tidal volume - dead space)
9
Q
What is the relationship between alveolar ventilation and alveolar PCO2
A
inverse
