Which of the following is the normal ratio of dead space to tidal volume (VD/VT)?

a. 0.2-0.4
b. 0.4-0.6
c. 0.6-0.8
d. 0.8-1.0

ANS: A
The normal ratio of dead space to tidal volume (VD/VT) is 0.2–0.4. In critically ill patients, this value can be greater than 0.7.

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