How many time constants are necessary for 95% of the tidal volume (VT) to be delivered from a mechanical ventilator?
a. 1
b. 2
c. 3
d. 4
ANS: C
One time constant allows 63% of the volume to be inhaled; 2 time constants allow about 86% of the volume to be inhaled; 3 time constants allow about 95% to be inhaled; 4 time constants allow about 98% to be inhaled; and 5 time constants allow 100% to be inhaled.
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