COPD General Management

The biggest mistake in COPD management isn't forgetting a medication — it's giving too much oxygen. A well-meaning liter flow adjustment can suppress the only breathing drive left.

COPD management centers on maintaining the patient's hypoxic drive and preventing acute decompensation. In advanced COPD, chronic CO2 retention shifts the respiratory drive from CO2 sensitivity (normal) to hypoxemia sensitivity. Oxygen is titrated to a target SpO2 of 88–92%, typically at 1–2 L/min via nasal cannula. Higher flows can eliminate the hypoxic drive, causing respiratory depression and CO2 narcosis. Beyond oxygen, management is structured in layers: smoking cessation is the single intervention that slows disease progression. Bronchodilators (short-acting first, then long-acting) open airways. Pulmonary rehabilitation improves functional capacity and quality of life. Annual influenza and pneumococcal vaccines reduce exacerbation frequency. Pursed-lip breathing slows expiratory flow, prevents airway collapse, and reduces air trapping — teach it to every COPD patient. During exacerbations, monitor ABGs for rising PaCO2 and falling pH, which signal impending respiratory failure. Position the patient upright or in high Fowler's, encourage diaphragmatic breathing, and administer bronchodilators before corticosteroids.

Key Distinctions

Don't confuse the COPD oxygen target (88–92%) with the general target (≥95%) — applying the general target to a COPD patient can be lethal. Students mix up pursed-lip breathing (COPD — prevents airway collapse on exhalation) with incentive spirometry (postoperative — promotes deep inhalation). An ABG showing compensated respiratory acidosis (high CO2, near-normal pH, high bicarb) is baseline for COPD — don't panic-treat the CO2.

Clinical Pearl

Low and slow with O2: 1–2 L/min, target 88–92%. If SpO2 climbs above 92% on your watch, you're part of the problem, not the solution.