PHTY304 Lecture Notes - Lecture 10: Bone Density, Vitamin D Deficiency, Kyphosis
Document Summary
Ad: based on the principle of reaching the highest possible airflow in different generations of bronchi by controlled breathing. Aims to avoid airway closure that may be caused by coughing and forced expiratory manoeuvres. Pep therapy: used in the presence of small airway obstruction caused by secretion retention, the relative resistance to airflow in collateral channels will be reduced. Percussion and vibration: percussion is a useful technique to help mobilise mucus and may stimulate increased tidal volumes and coughing in infants and children. Vibration produces a lower frequency of oscillation than percussion but produces higher expiratory flow rates than pep or oscillating pep. High frequency chest wall oscillation (hfcwo): patient-delivered form of airway clearance therapy consisting of an inflatable vest and an air-pulse generator. Hfcwo assists sputum removal by increasing air flow at low lung volumes; increasing expiratory flow bias, resulting in an increased annular flow of mucus toward the mouth; and decreasing viscoelasticity of mucus by reducing cross-linking.
