Which is the correct formula to calculate the alveolar minute ventilation of a spontaneously breathing subject?
a. f ? VDS/VT
b. f ? VT
c. f ? (VT – VDSphys)
d. f ? (VT + VDSphys)
ANS: C
Physiologic dead space includes both the normal and abnormal components of wasted ventila-tion. VDphy is the preferred clinical measure of ventilation efficiency. Measuring VDphy more accu-rately assesses alveolar ventilation.
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