Which Answer is Consistent with the Flow-Volume Curve Shown?

Question

Which answer is consistent with the flow-volume curve shown? 
A) Normal forced expiratory flow pattern 
B) Variable intrathoracic obstruction 
C) Airway obstruction 
D) Fixed extrathoracic obstruction

Accepted Answer

The flow-volume curve shows a pattern consistent with airway obstruction. There is a reduced peak expiratory flow rate and a flattened expiratory limb, indicating difficulty with expelling air from the lungs. This pattern is often seen in conditions such as asthma and chronic obstructive pulmonary disease (COPD).