A pulmonary function study reveals a forced vital capacity (FVC) that is greater than a slow vital capacity (SVC). To which of the following can this be attributed?
A. chronic air-trapping
B. poor patient effort on the SVC maneuver
C. partial diaphragmatic paralysis
D. excessive effort on the FVC maneuver
Ans: B. When the patient exhales slowly they are able to breathe out more air than if they were to exhale quickly. For this reason, and FVC should always be less than an SVC. If FVC is noted to be higher than the SVC, this is clear evidence that the patient's effort during the SVC maneuver was poor or insufficient.
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