Spirometery Flashcards
1
Q
How do you calculate FRV and IC?
A
FRV = ERV + RV
TV + IRV = IC
2
Q
What is the FEV1 to FVC ratio in obstructive diseases such as asthma and COPD?
A
Less than 70%
3
Q
Explain why in obstructive disorders such as asthma the descent of the graph shows scalloping?
A
Large airways are normal and not narrowed - small airways are narrow
The ascent of the graph - represents large airways due to rapid movement of air occurring here
Descent of graph above X axis shows movement of air through small airways.
Movement of air through narrow small airways is more affected in asthma due to narrowing.
4
Q
Name a variable and fixed upper award obstruction.
A
Laryngeal polyp
Tracheal stenosis
