What is the inspiratory time for a frequency of 30 breaths/min and an inspiratory time-to-expiratory time ratio of 1:3?
a. 0.13 second c. 0.75 second
b. 0.50 second d. 2.00 seconds
ANS: B
Total cycle time = 60 s ÷ frequency = 60 ÷ 30 = 2 s. There are four equal parts to the total cycle time (add the "I" from the inspiratory time-to-expiratory time ratio to the "E" from the inspirato-ry time-to-expiratory time ratio, or 1 + 3 = 4). Inspiratory time = Total cycle time ÷ (I + E) = 2 ÷ 4 = 0.5 s.
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