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In: Anatomy and Physiology

How would your FEV1/FVC ratio be affected if your lips were not sealed on the mouthpiece...

How would your FEV1/FVC ratio be affected if your lips were not sealed on the mouthpiece during a test?

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Expert Solution

The spirometry test measures the ratio of forced expiratory volume in 1sec(FEV1) to forced vital capacity(FVC).
FEV1 is amount of air expired forcefully in 1 second.
FVC is the measure of amount of air exhaled forcefully after a maximum inspiration.
The FEV1/FVC ratio is decreased in obstructive lung diseases like COPD, emphysema, asthma.
The FEV1/FVC ratio is increased or normal with low FEV1 and FVC in restrictive lung diseases such as cyctic fibrosis, pneumonia or sarcoidosis.

In the spirimetry test a mouth piece is given which connects to the spirometer. The patient is asked to breath in breath out from mouth through spirometer.
Ensure that the patient lips are sealed around the mouthpiece throughout the process. If not it will cause leakage of exhaled air. This loss of air can result in error in measurement of forcefully exhaled air. This will result in increased or decreased fev1, fvc and fev1/fvc ratio leading to wrong interpretation of results.

Sydney Mullin answered 2 years ago
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