Which of the following is false about the P0.1 measure? a. ...

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Which of the following is false about the P0.1 measure?
 
  a. P0.1 correlates well with central respiratory drive.
  b. P0.1 is the airway pressure measured 100 msec after occlusion.
  c. P0.1 is an effort-dependent measure of res-piratory drive.
  d. Chronic obstructive pulmonary disease (COPD) patients with a P0.1 greater than 6 cm H2O are difficult to wean.

Question 2

Which of the following signs observed on a mechanically ventilated patient indicate that suc-cessful weaning is unlikely?
 
  1. Palpable scalene muscle use during inspiration
  2. Palpable abdominal tensing during expiration
  3. Presence of an irregular breathing pattern
  4. Patient unable to alter breathing pattern on command
  a. 2 and 4 only
  b. 1, 2, and 3 only
  c. 3 and 4 only
  d. 1, 2, 3, and 4

[BAOCHAU2803]

Answer to Question 1

ANS: C
Airway occlusion pressure (P0.1) is the inspiratory pressure measured 100 msec after airway oc-clusion. The P0.1 is effort independent and correlates well with central respiratory drive. Ventila-tor-dependent patients with COPD who have a P0.1 greater than 6 cm H2O tend to be difficult to wean.

Answer to Question 2

ANS: D
Evaluation of patients for the presence of palpable scalene muscle use during inspiration, an ir-regular ventilatory pattern, palpable abdominal muscle tensing during expiration, and inability to alter ventilatory pattern on command can be helpful in assessment of the potential for prolonged spontaneous ventilation.

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