A subject with an RV that is 60% of the predicted value and an RV/TLC ratio of approximately 20% would most likely have:
A) An obstructive disease pattern
B) A restrictive disease pattern
C) Combined obstruction and restriction
D) Normal lung function

Question

Quizplus · Accepted Answer

An RV/TLC ratio of approximately 20% suggests a restrictive disease pattern. This means that the lungs have reduced expansion, making it difficult to fully inhale. An RV that is 60% of the predicted value would also be reduced, which is consistent with the decreased lung expansion seen in a restrictive pattern. An obstructive disease pattern would have an increased RV and decreased FEV1/FVC ratio, while combined obstruction and restriction would have both reduced lung volumes and decreased FEV1/FVC ratio. A normal lung function would have values within normal range for all lung function tests.

A Subject with an RV That Is 60% of the Predicted