A patient being ventilated in the volume-controlled continuous ...

[jCorn1234]

A patient being ventilated in the volume-controlled continuous mandatory ventilation mode had a measured tidal volume of 620 mL for the breath shown in the pressure-time scalar in the figure. What is the static compliance?
 
  a. 18 mL/cm H2O c. 31 mL/cm H2O
  b. 21 mL/cm H2O d. 62 mL/cm H2O

Question 2

Which of the following is a mode of ventilation that is time triggered or patient triggered as well as pressure limited and time cycled?
 
  a. Pressure-support ventilation
  b. Pressure-controlled intermittent mandato-ry ventilation
  c. Pressure-controlled continuous mandatory ventilation
  d. Dual control continuous mandatory venti-lation

[kjo;oj]

Answer to Question 1

ANS: C
Static lung compliance = Tidal volume  (Plateau pressure  Positive end-expiratory pressure) = 620 mL  (30 cm H2O  10 cm H2O) = 31 mL/cm H2O.

Answer to Question 2

ANS: C
Time triggered means that there are ventilator-initiated breaths. Patient triggered means that the patient is allowed to do the work to trigger a ventilator breath. Each breath is ended by a set in-spiratory time. This is the description of the pressure-controlled continuous mandatory ventilation mode. All pressure-support ventilation breaths are patient triggered and flow cycled. Pres-sure-controlled intermittent mandatory ventilation breaths allow spontaneous breaths between ventilator breaths, and those breaths are flow cycled. Dual control continuous mandatory ventila-tion is a dual control mode of ventilation in which the breath may start out as pressure-limited but switch to volume-limited if the volume setting is not reached.

[jCorn1234]

Excellent

[peter]

TYSM