Lecture 3 - Spirometry Flashcards
Lung volume is standardized to height, gender, and age. How does it change with change in these parameters?
Increases with height.
Larger volume in males than females.
Decreases with age.
The duration of Expiration when measuring a Flow volume loop or Volume Time plot should be about ____s.
6s
When Obstructive lung disease is suspected, you should test for ______. What does that mean?
Reactivity
That means you give the patient a bronchodilator and see if their Flow Volume loop and Volume Time curve move closer to normal.
Will someone with a Restrictive lung disease respond to an inhaler?
No
Tracheal pressure is less than atmospheric pressure on _____ and greater than atmospheric pressure on ______.
Inspiration
Expiration
Pleural pressure is usually ____ (positive or negative?), and it becomes more so on _______. With forced expiration, it becomes ______ (positive or negative?).
Negative
Inspiration
Positive
Flattening of the Inspiration aspect (bottom of the loop) on a flow volume loop indicates an obstruction in the ________ airway (intra or extrathoracic?).
Extrathoracic –> so above the lungs/outside the pleural cavity.
Flattening of the Expiration aspect (the top of the loop) on a flow volume loop indicates an obstruction in the _______ airway (intra or extrathoracic?).
Intrathoracic –> so within the pleural cavity.
If both the Inspiration and Expiration aspects of the flow volume loop are flattened out, it indicates a ______ obstruction.
Fixed obstruction (so there’s no change in the airway diameter on inspiration or expiration). This appearance on flow volume loop could suggest severe tracheal stenosis, among other things, and it is a medical emergency!
How is the FEV1/FEC ratio changed in Obstructive vs Restrictive disease?
FEV1/FEC is REDUCED with OBSTRUCTIVE disease. The ratio remains basically NORMAL with RESTRICTIVE disease.
How does TLC change in Restrictive vs Obstructive disease?
TLC is decreased in Restrictive, but it remains the same in Obstructive.
