Friday, January 23, 2015

The answer is a. The FEV1 (forced expiratory volume in 1 second) as a fraction of the FV


In managing the patient with COPD, the measurement or finding which best corresponds with day-to-day
function and long-term prognosis is the:
a. Forced expiratory volume in 1 second as a fraction of the forced vital capacity (FEV1%).
b. Arterial blood gas.
c. Dead-space volume.
d. Chest radiograph.
e. Forced vital capacity.


The answer is a. The FEV1 (forced expiratory volume in 1 second) as a fraction of the FVC (forced vital capacity) correlates well with physiologic function. An increase in dead space is common in COPD but is poorly correlated with function or prognosis. CXR is often misleading in predicting performance, although it can rule out superimposed complications. A single blood gas is not predictive of long-term prognosis. A combination of physiologic and laboratory tests is necessary to accurately stage the severity of disease.

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