1 RSPT 1410 Lung Expansion Therapy Part 1: General Information Wilkins: Chapter 39, p. 905-909 2 Lung Expansion Therapy • Includes a variety of modalities – Incentive Spirometry – Intermittent Positive Pressure Breathing (IPPB) – Continuous Positive Airway Pressure (CPAP) – Positive Expiratory Therapy (PEP) • No one therapy is conclusively better • RCP and physician should decide on best choice making most efficient use of resources 3 Lung Expansion Therapy • Atelectasis is most common indication – __________________ atelectasis: collapse of distal lung units due to mucus plugging of airways – _____________ atelectasis: collapse of distal lung units due to persistent ventilation with small VTs • Patients at risk for atelectasis include those – who have had thoracic or abdominal surgery – with neuromuscular disorders – who are sedated – with spinal cord injuries – who are bedridden 1 4 Lung Expansion Therapy • __________ patients have highest risk due to – general anesthesia – shallow breathing – decreased ciliary activity – transient decrease in surfactant production • These factors cause a progressive __________ in FRC during the first 48 hours following surgery • The decrease in FRC is associated with alveolar collapse, most often in the lung __________ 5 Lung Expansion Therapy 6 Lung Expansion Therapy . . • Since perfusion remains unchanged, a V/Q mismatch results, causing ______________ • Pain further restricts ventilation as does the tendency to “splint” muscles in the incision area • A decreased ability to take ______________ postoperatively also inhibits coughing, leading to increased secretions in the airway and possible atelectasis 2 7 Lung Expansion Therapy • In the postoperative period, patients with any disease that increases __________________ and those with a history of ______________ are also at higher risk for atelectasis 8 Lung Expansion Therapy • Clinical signs of atelectasis – With minimal atelectasis, signs may be _________ – Increased respiratory rate – Fine, late inspiratory ______________ over affected area – Bronchial breath sounds – Decreased breath sounds – ______________ (if hypoxemia is present) – Atelectasis alone does not cause a fever unless ______________ is also present 9 Lung Expansion Therapy • Radiographic signs of atelectasis – Atelectatic region will show increased __________ – Evidence of volume loss • • • • • • • • Displacement of interlobar fissures Crowding of pulmonary vessels Air ______________ Elevation of diaphragm ______________ of trachea, heart & mediastinum Pulmonary opacification Narrowing of space ______________ Compensatory hyperexpansion of surrounding lung 3 10 Lung Expansion Therapy • How does it work? – All methods of lung expansion therapy ______________ lung volume by increasing the transpulmonary pressure gradient (PL) – PL represents the difference between the alveolar pressure (Palv) and the pleural pressure (Ppl) PL = Palv – Ppl – If all else is constant, the greater the PL, the more the alveoli ______________ 11 Lung Expansion Therapy • PL can be increased by – decreasing the surrounding pleural pressure as with a ______________ (A) – increasing the alveolar pressure as with a inspiration (B) • Decreasing pleural pressure is more physiological and often more effective, but requires an ___________, ________________ patient 12 PL = Palv – Ppl Initial Final Maneuver Palv Ppl Palv Ppl SI 0 -4 0 -14 PPI 0 -4 13 -1 14 4