Two different problems
Atelectasis needs volume. Retained secretions need clearance. Choosing the wrong family is the classic exam error.
- Lung expansion therapy: incentive spirometry, IPPB, CPAP/EPAP, and deep breathing — for atelectasis and postoperative prevention.
- Secretion clearance: directed cough, postural drainage and percussion, PEP and oscillating PEP, high-frequency chest wall oscillation, and airway clearance devices — for retained secretions.
- Incentive spirometry is first line for the cooperative postoperative patient; it needs a vital capacity above roughly 10 mL/kg and an inspiratory capacity above about one third of predicted.
- IPPB is reserved for the patient who cannot take a deep breath on their own or needs short-term hyperinflation with medication delivery.
An unconscious patient cannot use an incentive spirometer. The device must match what the patient can actually do.