Which of the following parts are required to conduct high-frequency external chest wall com-pression?

1. Variable air-pulse generator
2. Expiratory flow resistor with one-way valve
3. Nonstretch inflatable thoracic vest
a. 1 and 2 only
b. 2 and 3 only
c. 1 and 3 only
d. 1, 2, and 3

ANS: C
High-frequency chest wall oscillation is accomplished by using a two-part system: (1) a variable air-pulse generator and (2) a nonstretch inflatable vest that covers the patient's entire torso (The Vest Airway Clearance System).

Health Professions

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