Author Question: What is the inspiratory time for a frequency of 30 breaths/min and an inspiratory time-to-expiratory ... (Read 72 times)

joe · **on:** Jul 16, 2018

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

Question 2

What is the inspiratory time for a tidal volume of 600 mL and a flow rate of 60 L/min?

a. 0.1 second c. 1.0 second
b. 0.6 second d. 6.0 seconds

jointhecircus · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

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.

Answer to Question 2

ANS: B
Inspiratory time = Tidal volume (in liters) Flow rate (in liters/second) = 0.6 L 1 L/s = 0.6 s.