Which of the following are typical of high-frequency external chest wall compression therapy? 1. 30-min therapy sessions 2. Long inspiratory oscillations 3. One to six sessions per day 4. Oscillations at 20 to 25 Hz
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: C
Typically, respiratory therapists perform 30-min therapy sessions at oscillatory frequencies be-tween 5 and 25 hertz (Hz). Depending on need and response, between one and six therapy ses-sions may occur per day.
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