Which of the following may indicate a decrease in systemic ...

[KimWrice]

Which of the following may indicate a decrease in systemic vascular blood flow during high-frequency ventilation?
 
  1. High central venous pressure (CVP)
  2. Low CVP
  3. Decreased mean arterial pressure (MAP)
  4. Increased MAP
  a. 1 and 3 only
  b. 2 and 3 only
  c. 1 and 4 only
  d. 1, 2, 3, and 4

Question 2

In high-frequency ventilation (HFV), CO2 elimination depends mainly on which of the follow-ing?
 
  a. Pressure amplitude
  b. Mean airway pressure
  c. High-frequency rate
  d. Sinusoidal waveform

[bhavsar]

Answer to Question 1

ANS: B
Increases in CVP or decreases in MAP indicate decreases in systemic blood flow as a result of overdistention of the lung and inappropriately high Paw, after adequate intravascular volume has been established.

Answer to Question 2

ANS: A
The minute ventilation delivered with HFV has a greater dependency on alterations in tidal vol-ume rather than breath frequency, with tidal volume most affected by changes in pressure or am-plitude (increased pressure change or amplitude increases tidal volume).