Which of the following statements is false regarding ...

[stevenposner]

Which of the following statements is false regarding pressure-supported ventilation?
 
  a. It is patient triggered, pressure limited, and flow cycled.
  b. It can reduce the work of breathing during intermittent mandatory ventilation mode.
  c. The usual range is 10 to 15 cm H2O.
  d. It is recommended for use in most patients in the intermittent mandatory ventilation (IMV) mode.

Question 2

What phrase is used to describe the situation where the patient with acute lung injury is ventilat-ed with a smaller tidal volume and the PaCO2 is allowed to increase above normal range to avoid additional lung injury?
 
  a. Physiologic ventilation
  b. Permissive hypercapnia
  c. Adjusted ventilation
  d. Dialed acidosis

[Tabitha_2016]

Answer to Question 1

ANS: C
Pressure support ventilation assists the patient's spontaneous inspiration with a clinician-selected level of positive pressure. Pressure support is patient triggered, pressure limited, and flow cycled. Pressure support ventilation can reduce work of breathing and may improve patient-ventilator synchrony and comfort while limiting the pressure applied to the airway. Pressure support to overcome WOBI should be considered in the care of all spontaneously breathing patients in the IMV mode. IMV, as originally developed, allowed spontaneous breathing interspersed with volume-limited, patient- or time-triggered machine breaths. The WOBI during spontaneous breathing due to slow demand flow systems, ventilator circuitry, and the artificial airway prompted the addition of pressure support. Today it is suggested that all spontaneous breaths during IMV be supported with an appropriate level of pressure support, usually in the range of 5 to 10 cm H2O, to overcome the WOBI.

Answer to Question 2

ANS: B
This technique is known as permissive hypercapnia.