A patient receiving continuous mandatory ventilation in the control mode has an inspiratory time of 1.5 sec and an expiratory time of 2.5 sec. What is the frequency of breathing?
A) 10/min
B) 12/min
C) 15/min
D) 18/min

Question

Quizplus · Accepted Answer

The frequency of breathing can be calculated by adding the inspiratory time and expiratory time and taking the reciprocal of that value. 
Frequency (breaths/min) = 60 / (inspiratory time + expiratory time)
Frequency (breaths/min) = 60 / (1.5 + 2.5) 
Frequency (breaths/min) = 60 / 4 
Frequency (breaths/min) = 15 
Therefore, the frequency of breathing is 15 breaths per minute, which corresponds to choice C.

A Patient Receiving Continuous Mandatory Ventilation in the Control Mode