What can cause a decrease in pump flow? a. Both an increase in ...

[segrsyd]

What can cause a decrease in pump flow?
 
  a. Both an increase in preload and an in-crease in afterload
  b. Both a decrease in preload and a decrease in afterload
  c. An increase in preload or decrease in af-terload
  d. A decrease in preload or increase in after-load

Question 2

Which of the following is the typical ratio of sweep flow to pump flow?
 
  a. 1:1
  b. 3:1
  c. 6:1
  d. 9:1

[ecox1012]

Answer to Question 1

ANS: D
A decrease in preload or increase in afterload can cause a decreased pump flow.

Answer to Question 2

ANS: A
The ratio of sweep flow to pump flow is often 1:1. When using 4 L/min pump flow, typically the sweep flow would be initiated at 4 L/min. The oxygenator functions to provide gas exchange much like native lungs perform gas exchangeO2 diffuses into the blood from a gas source with a higher partial pressure and carbon dioxide diffuses out of the blood into a gas source with a lower partial pressure.