QuestionSBA
QuestionChoice
In COPD, FEV1/FVC is reduced. The threshold for diagnosis is often an FEV1/FVC ratio below 80%. Given the low FEV1, this could be a mixed picture of both obstructive and restrictive disease.
10002156
e
FEV1: 50% of predicted, FEV1/FVC: 95% of predicted
QuestionChoice
This could be indicative of a restrictive lung disease where FEV1/FVC ratio is >80% due to a drop in FVC with maintained FEV1. This could be better assessed if FVC was also provided.
10002155
d
FEV1: 80%, FEV1/FVC: 90% of predicted
QuestionChoice
In COPD, FEV1 and FEV1/FVC are reduced. The threshold for diagnosis is often an FEV1/FVC ratio below 80%. FEV1 of 100% is also unlikely to be seen in COPD. If FVC and patient symptoms were also provided, we could assess if restrictive lung disease is a plausible differential here.
10002153
b
FEV1: 100% of predicted, FEV1/FVC: 80% of predicted
QuestionChoice
In COPD, FEV1/FVC is reduced. The threshold for diagnosis is often an FEV1/FVC ratio below 80%. An FEV1 of 85%, however, is possible.
10002154
c
FEV1: 85% of predicted, FEV1/FVC: 90% of predicted
QuestionChoice
COPD is an obstructive lung disorder characterised by reduced FEV1 and FEV1/FVC ratio due to airway obstruction. In COPD, the FEV1/FVC ratio is reduced because the airways are narrowed and there is increased resistance to airflow. This results in a decrease in the amount of air that can be exhaled in the first second (FEV1) relative to the total amount of air that can be exhaled (FVC).
10002152
a
FEV1: 74% of predicted, FEV1/FVC: 63% of predicted
Concept
Chapter
2693
3717
Chronic obstructive pulmonary disease (COPD)
Topic
132
Respiratory
12977
Spirometry is required for the diagnosis of COPD.

Which of the following sets of spirometry results is most indicative of COPD?
a