What Does an FEF_50%/FIF_50% 1.0 Suggest

Question

What does an FEF50%/FIF50%>1.0 suggest?
A) A variable intrathoracic obstruction
B) A fixed obstruction
C) Chronic obstructive lung disease
D) A variable extrathoracic obstruction

Accepted Answer

The abbreviation suggests a flow-volume loop measurement, with FEF_50% referring to forced expiratory flow at 150 milliliters per second, and FIF_50% referring to forced inspiratory flow at the same rate. The >1.0 suggests that the expiratory flow is greater than the inspiratory flow, indicating a potential variable extrathoracic obstruction.

What does an FEF50%/FIF50% >1.0 suggest?

What does an FEF_50%/FIF_50% >1.0 suggest?