What is the total cycle time for a frequency of 14 breaths/min ...

[Bernana]

What is the total cycle time for a frequency of 14 breaths/min and a ratio of inspiratory time to expiratory time of 1:3?
 
  a. 1.07 second c. 3.21 seconds
  b. 2.33 seconds d. 4.29 seconds

Question 2

What is the inspiratory time for a frequency of 20 breaths/min and an inspiratory time-to-expiratory time ratio of 1:3?
 
  a. 0.25 second c. 1.00 second
  b. 0.75 second d. 1.33 seconds

[mochi09]

Answer to Question 1

ANS: D
Total cycle time = 60 s  frequency = 60  14 breaths/min = 4.29 s.

Answer to Question 2

ANS: B
Total cycle time = 60 s  frequency = 60  20 = 3 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) = 3  4 = 0.75 s.