Which of the following will make an intermittent positive-pressure breathing (IPPB) device cycle off prematurely?
1. Airflow obstructed
2. Kinked tubing
3. Occluded mouthpiece
4. Active resistance to inhalation
a. 1 and 2 only
b. 1 and 3 only
c. 1, 3, and 4 only
d. 1, 2, 3, and 4
ANS: D
An IPPB device may cycle off prematurely when airflow is obstructed. Kinked tubing, an oc-cluded mouthpiece, and active resistance to inhalation by the patient are the most common causes of this problem.
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