Calculate the inspiratory to expiratory (I:E) ratio for a ventilator that is set to deliver 850 mL at a frequency of 15 breaths/min with a flow rate of 45 L/min
a. 1:1.1
b. 1:2.5
c. 1:3.5
d. 1:4
ANS: B
Minute ventilation equals respiratory rate multiplied by tidal volume.
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