Questions: Question 15 of 20 Which technique helps remove bronchial secretions by creating external airway oscillations? Flutter valve Mechanical insufflation-exsufflation (MIE) Intrapulmonary percussive ventilation (IPV) High-frequency chest wall compression (HFCWC)

The answer is the fourth one (D): High-frequency chest wall compression (HFCWC).

Explanation for each option:

1. Flutter valve: This device helps clear mucus from the lungs by creating vibrations in the airways when the patient exhales through it. While it does create oscillations, it is not considered an external airway oscillation technique.

2. Mechanical insufflation-exsufflation (MIE): This technique, also known as a cough assist device, helps clear secretions by simulating a cough through alternating positive and negative pressure. It does not create external airway oscillations.

3. Intrapulmonary percussive ventilation (IPV): This technique delivers small bursts of air into the lungs to help mobilize secretions. It involves internal airway oscillations rather than external ones.

4. High-frequency chest wall compression (HFCWC): This technique uses an inflatable vest that rapidly inflates and deflates to create external oscillations on the chest wall, helping to loosen and mobilize bronchial secretions.

Summary: High-frequency chest wall compression (HFCWC) is the technique that helps remove bronchial secretions by creating external airway oscillations.