Author Question: What is the inspiratory time-to-expiratory time ratio given the following data: frequency of 12 ... (Read 64 times)

Alainaaa8 · **on:** Jul 16, 2018

What is the inspiratory time-to-expiratory time ratio given the following data: frequency of 12 breaths/min; inspiratory time of 0.90 second?

a. 1:0.22 c. 1:4.6
b. 1:2 d. 1:6.4

Question 2

What is the mode depicted in the pressure-versus-time waveform in the figure?

a. Airway pressure-release ventilation
b. Bilevel positive airway pressure
c. Pressure-controlled intermittent mandato-ry ventilation plus pressure support
d. Volume-controlled intermittent mandatory ventilation plus pressure support

janeli · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: C
Inspiratory time-to-expiratory time ratio = Inspiratory time/Expiratory time and Expiratory time = Total cycle time Inspiratory time. Inspiratory time-to-expiratory time ratio = Inspiratory time/Total cycle time Inspiratory time. Total cycle time = 60 12 = 5 s. Inspiratory time-to-expiratory time ratio = 0.9/5 0.9 = 0.9/4.1. Reduce the inspiratory time-to-expiratory time ratio to its simplest form; divide the numerator and the denominator by inspiratory time. 0.9 0.9/4.1 0.9 = 1:4.56, or 1:4.6.

Answer to Question 2

ANS: C
The larger flat-top pressure curves represent patient-triggered, pressure-limited, time-cycled breaths from the ventilator. The smaller flat-top pressure curves represent patient-triggered, pressure-limited (pressure-supported) spontaneous patient breaths. Pressure-supported spontane-ous breaths between patient-triggered ventilator breaths are depicted in the figure. This is inter-mittent mandatory ventilation, and, more specifically, it is pressure-controlled intermittent man-datory ventilation because the ventilator breaths are pressure limited.