Which of the following values of VD/VT, are suitable for weaning? 1. 0.10 2. 0.20 3. 0.30 4. 0.60
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
A VD/VT ratio greater than 0.60 is predictive of lack of success at discontinuance of ventilation.
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