Author Question: In which of the following modes of ventilatory support would the patient's work of breathing be ... (Read 49 times)

yoroshambo · **on:** Jul 16, 2018

In which of the following modes of ventilatory support would the patient's work of breathing be least?

a. Continuous positive airway pressure (CPAP)
b. Pressure-supported ventilation (PSV)
c. Intermittent mandatory ventilation (IMV)
d. Continuous mandatory ventilation (CMV)

Question 2

During pressure-controlled continuous mandatory ventilation, when the patient's lung compliance increases, which of the following will occur?

a. The tidal volume will increase.
b. The FRC will increase.
c. The peak airway pressure will increase.
d. The inspiratory time will decrease.

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

Answer to Question 1

ANS: D
As the mode is changed from CPAP to PSV to synchronized intermittent mandatory ventilation to time-triggered CMV, the ventilator assumes more of the work.

Answer to Question 2

ANS: A
During pressure-controlled continuous mandatory ventilation, the pressure delivered is constant. In lung mechanics, pressure = tidal volume/lung compliance. Since pressure is constant when lung compliance increases the tidal volume also increases.