Which of the following can increase the physiological dead space ...

[corkyiscool3328]

Which of the following can increase the physiological dead space in apneic patients receiving volume control ventilation?
 
  a. I:E ratio >1:1
  b. A slow flow rate
  c. Adding an inflation hold
  d. Inspiratory time <0.5 second

Question 2

Calculate the cerebral perfusion pressure when the mean arterial blood pressure is 120 mm Hg and the ICP is 14 mm Hg.
 
  a. 134 mm Hg
  b. 106 mm Hg
  c. 120/14 mm Hg
  d. 134/106 mm Hg

[blfontai]

Answer to Question 1

ANS: D
In an apneic patient receiving volume control ventilation, an inspiratory time that is too short (i.e., <0.5 second) may result in an increase in physiological dead space. Large I:E ratios and addition of an inflation hold increase the mean airway pressure. A slow flow rate can inverse the I:E ratio and also cause an increase in mean airway pressure.

Answer to Question 2

ANS: B
MABP  ICP = CPP