By Which of the Following Mechanisms Are High-Frequency Chest Compressions

By which of the following mechanisms are high-frequency chest compressions purported to mobilize tracheobronchial secretions?

A) By dislodging mucus directly from bronchial walls
B) By advancing the mucociliary escalator at a faster than normal rate
C) By mechanically lysing long molecules of mucus into smaller, more mobile segments
D) By generating brief periods of high expiratory airflow

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