Calculate the inspiratory to expiratory (I:E) ratio when the inspiratory time is 0.5 second and the respiratory rate is 30 breaths/min

a. 1:3
b. 1:4
c. 4:1
d. 3:1

ANS: A
Total Cycle Time (TCT) = 60 sec/f; TCT – Inspiratory Time (TI) = Expiratory Time (TE); TI:TE = 1:X.

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