Autogenic Drainage Technique This is a patient-doing technique, and this includes shallow breath, slightly deeper breath, and forceful exhalation. In the first step, mucus loses its place. In the second step, mucus or secretion mobilizes, and then in the end, secretion moves to the throat for expulsion. Chest percussion “Chest percussion or clapping” is a... https://phsiopedia.com/what-is-the-manual-and-ai-machine-chest-physio/