What is the normal disparity between end-tidal PCO2 and PaCO2? ...

[oliviahorn72]

What is the normal disparity between end-tidal PCO2 and PaCO2?
 
  a. End-tidal PCO2 is 1 to 5 mm Hg less than PaCO2
  b. End-tidal PCO2 is 5 to 10 mm Hg less than PaCO2
  c. End-tidal PCO2 is 1 to 5 mm Hg higher than PaCO2
  d. End-tidal PCO2 is 5 to 10 mm Hg higher than PaCO2

Question 2

Which of the following are associated with a decreased end-tidal PCO2? 1. Decreased metabolic rate 2. Increase in lung perfusion 3. Rapid and very shallow breathing 4. Decreased CO2 production
 
  a. 1 and 3 only
  b. 1, 2, and 3 only
  c. 2 and 4 only
  d. 1, 3, and 4 only

[mathjasmine]

Answer to Question 1

ANS: C
The PETCO2 normally is 1 to 5 mm Hg less than the PaCO2.

Answer to Question 2

ANS: D
Positive pressure ventilation (especially with PEEP), pulmonary embolism, cardiac arrest, and pulmonary hypoperfusion also may cause an increase in PaCO2 to PETCO2 gradient
P(aET)CO2. Exercise and a large tidal volume can reverse the P(aET)CO2 gradient, the PETCO2 can actually exceed the PaCO2.

[oliviahorn72]

TY

[mathjasmine]

Happy to Help