What is the least reliable weaning index? a. Vital capacity ...

[acc299]

What is the least reliable weaning index?
 
  a. Vital capacity (VC)
  b. Maximum inspiratory capacity (MIP)
  c. Minute ventilation (VE)
  d. Rapid-shallow breathing index (f/VT)

Question 2

Which of the following oxygenation measures support a patient's readiness to wean? 1. PaO2/PAO2 (a/A) = 0.45 2. PaO2/FiO2 (P/F) = 110 3. PAO2  PaO2 = 240 mm Hg 4. Physiologic shunt (Qs/Qt) = 12
 
  a. 1 and 3 only
  b. 1, 2, and 3 only
  c. 2 and 4 only
  d. 1, 3, and 4 only

[cpetit11]

Answer to Question 1

ANS: A
With respect to the more traditional weaning indices, vital capacity can be highly variable, whereas MIP, minute ventilation, respiratory rate (f), and f/VT tend to be more reliable.

Answer to Question 2

ANS: D