Oxygen Therapy Guidelines

Introduction to Oxygen Therapy

The British Thoracic Society recommends targeting oxygen saturation of 94-98% using nasal cannulae starting at 1-2 L/min or simple face mask at 5-6 L/min for most acutely ill patients without risk of hypercapnia 1, 2, 3
For patients with COPD and other hypercapnic risk conditions, the target saturation is 88-92% using 24% Venturi mask at 2-3 L/min or nasal cannulae at 1-2 L/min 5, 7

Initial therapy for standard acute hypoxemia involves starting with nasal cannulae at 1-2 L/min or simple face mask at 5-6 L/min if cannulae are not tolerated, with a target saturation of 94-98% 1, 4
The titration algorithm allows for 5 minutes between adjustments, escalating through nasal cannulae 1→2→4 L/min, then simple face mask 5-6 L/min, with a target saturation of 94-98% 1, 4

For COPD and hypercapnic risk conditions, the initial therapy is 24% Venturi mask at 2-3 L/min, with a target saturation of 88-92% 7, 6
Alternatives include 28% Venturi mask at 4 L/min or nasal cannulae at 1-2 L/min if 24% mask is unavailable, with a target saturation of 88-92% 7, 6

For critical illness, including sepsis, trauma, and shock, initiate oxygen therapy with a reservoir mask at 15 L/min, targeting a saturation of 94-98% 1, 2, 3
Post-resuscitation management involves titrating down to maintain 94-98% saturation once spontaneous circulation is restored and reliable oximetry is available 1, 2

For carbon monoxide poisoning, use maximum oxygen via reservoir mask or bag-valve mask regardless of oximetry reading, which may be falsely normal 2, 3
For major head injury, consider early intubation if comatose, targeting a saturation of 94-98% 2, 3

For pneumonia with desaturation, the initial approach is based on severity, with a target saturation of 94-98% unless hypercapnic risk factors are present 8
For SpO2 <85%, use a reservoir mask at 15 L/min immediately, and for SpO2 ≥85%, use nasal cannulae 2-6 L/min or simple face mask 5-10 L/min 8

For ARDS, follow the same critical illness algorithm, with initial oxygen therapy starting with maximum conventional delivery before considering advanced interventions 1, 2, 3

The upward titration steps for oxygen therapy include nasal cannulae 1-4 L/min, simple face mask 5-6 L/min, Venturi 35-60% at 8-15 L/min, and reservoir mask 15 L/min, with a target saturation of 94-98% for most patients and 88-92% for COPD and hypercapnic risk conditions 1, 4, 7, 8
Weaning criteria include clinical stability with saturation in the upper target range for 4-8 hours, reduction of oxygen concentration incrementally, and discontinuation when stable on minimal oxygen with saturation within the target range on two consecutive observations 8