Which interpretation is consistent with the following flow-volume curve?
A) Normal flow-volume loop
B) Variable intrathoracic obstruction
C) Variable extrathoracic obstruction
D) Fixed large airway obstruction

Question

Which interpretation is consistent with the following flow-volume curve? 
A) Normal flow-volume loop 
B) Variable intrathoracic obstruction 
C) Variable extrathoracic obstruction 
D) Fixed large airway obstruction

Quizplus · Accepted Answer

The flow-volume loop shows a variable extrathoracic obstruction, with a concave appearance on the expiratory limb indicating a decrease in expiratory flow rates, which suggests a narrowing of the extrathoracic airway. There is a normalization of the shape of the loop on inhalation, indicating that the obstruction is not fixed.

Which Interpretation Is Consistent with the Following Flow-Volume Curve