A respiratory rate of 40 breaths/min is required to ventilate an infant with an MVP-10. The in-spiratory and expiratory time settings that would provide 40 breaths/min are which of the fol-lowing? Inspiratory Time Expiratory Time
a. 0.25 s 0.9 s c. 0.75 s 2 s
b. 0.5 s 1 s d. 0.95 s 1.75 s
ANS: B
The total cycle time for 40 breaths/min is 60 ÷ 40 = 1.5 s. Inspiratory time plus expiratory time must equal 1.5 s. The only combination that adds up to 1.5 s is inspiratory time = 0.5 s and expir-atory time = 1 s.
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