What is the most common cause of hypoxemia in patients with lung ...

[Mimi]

What is the most common cause of hypoxemia in patients with lung disease?
 
  a. Diffusion defect
  b. Hypoventilation
  c. Right-to-left shunt
  d. mismatch

Question 2

In the presence of an acutely reduced arterial O2 content (hypoxemia), normal O2 delivery to the tissues can be maintained by which of the following?
 
  a. Hyperventilation (increased VA)
  b. Increased RBC production
  c. Increasing the cardiac output
  d. Peripheral vasoconstriction

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Answer to Question 1

ANS: D
Ventilation-perfusion () imbalances are the most common cause of hypoxemia in patients with lung disease.

Answer to Question 2

ANS: C
Oxygen delivery (O2) to the tissues is a function of arterial O2 content (CaO2) times cardiac out-put (t):
O2 = CaO2  t
If arterial O2 content falls an increased cardiac output will compensate.

[Mimi]

Thanks for the timely response, appreciate it

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