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Preoxygenation Techniques for Tracheal Intubation in Critically Ill Adults Utilizing Oxygen Mask and Noninvasive Ventilation

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The appropriate use of oxygen.

Canadian Family Physician Medecin De Famille Canadien

|January 22, 2011

Summary

Oxygen therapy shows limited evidence for acute hypoxemia but may decrease mortality in chronic hypoxemia. Current guidelines indicate treatment for PaO2 below 60 mmHg (acute) or 55 mmHg (chronic), with potential toxicity risks.

Area of Science:

Pulmonary Medicine
Critical Care Medicine
Respiratory Physiology

Background:

Limited evidence exists for oxygen therapy's efficacy in acute hypoxemia.
Continuous oxygen therapy appears to reduce mortality in chronic hypoxemia.
Oxygen therapy is indicated when PaO2 is less than 60 mmHg in acute hypoxemia and less than 55 mmHg in chronic hypoxemia.

Purpose of the Study:

To review the current scientific evidence for oxygen therapy in hypoxemia.
To outline the indications for oxygen treatment.
To describe the physical and physiological hazards of oxygen therapy, including pulmonary oxygen toxicity syndromes.

Main Methods:

Literature review of scientific evidence on oxygen therapy efficacy and hazards.
Analysis of current clinical guidelines for oxygen treatment indications.

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Description of identified syndromes of pulmonary oxygen toxicity.

Main Results:

Evidence for efficacy in acute hypoxemia is limited.
Continuous oxygen therapy is associated with decreased mortality in chronic hypoxemia.
Pulmonary oxygen toxicity can manifest as tracheobronchitis, adult respiratory distress syndrome, and bronchopulmonary dysplasia.

Conclusions:

Oxygen therapy has a mortality benefit in chronic hypoxemia but limited evidence in acute hypoxemia.
Careful consideration of risks, including pulmonary toxicity, is necessary when prescribing oxygen.
Adherence to established PaO2 thresholds is crucial for appropriate oxygen therapy initiation.