Percussion treatment. View of a physiotherapist giving percussion treatment to a young male cystic fibrosis patient. Cystic fibrosis is a hereditary disease affecting the exocrine glands. One of the effects of this is the production of thick mucus in the bronchi (pipes in the lungs). This causes the bronchi to expand (bronchiectasis) and leaves the patient open to secondary infection. Percussion on the chest and back loosens the mucus, which is coughed up. Antibiotics are used to combat secondary respiratory infections which may be severe.
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