What is the predicted change in tidal volume by adding 6 in of tubing to a ventilator circuit?
a. Decrease of 50 to 70 ml
b. Decrease of 30 to 50 ml
c. Decrease of 20 to 30 ml
d. No change
ANS: A
In general, VT reduces between 50 and 70 ml for each 6 in (15 cm) of dead space added by tub-ing in a circuit.
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