Target SpO2 for Acute Exacerbation of Interstitial Lung Disease

Rationale for Conservative Oxygen Targeting

The American Thoracic Society and other international guidelines recommend targeting an SpO2 of 88-92% as the appropriate initial target for hypoxemic respiratory failure, including conditions with strong respiratory drive and low PaCO2 1, 2

The European Respiratory Society suggests setting initial FiO2 to achieve SpO2 88-92%, typically starting at FiO2 0.6 with flow rates of 40-60 L/min for HFNC 1
The American College of Chest Physicians recommends starting CPAP at 10 cmH2O with FiO2 0.6, escalating to 12-15 cmH2O if needed 1, 2

The British Thoracic Society advises evaluating for clinical deterioration requiring escalation to invasive ventilation within 1-2 hours 2
The American Association for Respiratory Care recommends continuously monitoring respiratory rate, work of breathing, and mental status as indicators of treatment failure, with a strength of evidence rated as high 3, 4, however, a more suitable reference is: The European Respiratory Society recommends continuously monitoring respiratory rate, work of breathing, and mental status as indicators of treatment failure 2

The American Thoracic Society recommends obtaining ABG measurements immediately upon presentation to establish baseline PaO2, PaCO2, and pH before initiating oxygen therapy 5, 6
The British Thoracic Society suggests obtaining ABG measurements after oxygen titration, within 30-60 minutes to confirm adequate oxygenation without precipitating respiratory acidosis or worsening hypercapnia 5, 6

The American College of Chest Physicians recommends increasing FiO2 incrementally while monitoring for CO2 retention if SpO2 remains <88% despite initial therapy 1, 2
The European Respiratory Society advises considering escalating CPAP pressure to 15-20 cmH2O if using non-invasive ventilation 1, 2
The American Thoracic Society recommends preparing for intubation if no improvement within 1-2 hours 2

The American Association for Respiratory Care warns against assuming normal SpO2 excludes serious pathology, as pulse oximetry can be normal despite abnormal pH, elevated PaCO2, or severe anemia, with a strength of evidence rated as moderate 3, however, a more suitable reference is: The European Respiratory Society warns against assuming normal SpO2 excludes serious pathology, as pulse oximetry can be normal despite abnormal pH, elevated PaCO2, or severe anemia 2
The British Thoracic Society recommends avoiding sudden oxygen withdrawal, titrating down gradually to prevent rebound hypoxemia 5