A patient has an expired minute ventilation of 14.2 L and a ventilatory rate of 25/min. What is the average VT?
a. 568 ml
b. 635 ml
c. 725 ml
d. 410 ml
ANS: A
An alternate approach is to measure the total volume of air exhaled for 1 min (E) and then divide by the breathing frequency (f) counted during the same period. The following formula can be used to calculate the tidal volume: VT = E/f.
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