The American Thoracic Society has published a GRADE-based guideline on non-invasive respiratory support in adults with acute respiratory failure. It is informed by systematic reviews and network meta-analyses and appeared in September 2026.
The recommendations follow the type of failure. In acute hypoxaemic failure, high-flow nasal oxygen is strongly recommended, and NIV or CPAP conditionally, with close watch for escalation. In hypercapnic failure, NIV is strongly recommended to reduce mortality and intubation; high-flow is a conditional option only for milder cases with pH above 7.25 where NIV can be started promptly. High-flow or NIV is strongly recommended for preoxygenation before intubation. After extubation, high-flow is suggested for low-risk patients and NIV for high-risk ones.
For Indian wards and ICUs, where high-flow devices have become far more available since the pandemic, the key caution is hypercapnia. High-flow is not a substitute for NIV in a patient with COPD and significant acidosis. Delayed escalation remains the main hazard of any non-invasive strategy.
- Check a blood gas to separate hypoxaemic from hypercapnic failure before choosing a device
- Use NIV first for hypercapnic failure; reserve high-flow for pH above 7.25 with NIV ready
- Use high-flow as first-line support in hypoxaemic failure
- Preoxygenate with high-flow or NIV before intubation
- Set explicit escalation criteria and reassess within one to two hours
Why it matters
One guideline now covers the full range of non-invasive support, including when high-flow is not enough.
Don't overread it
Several recommendations are conditional and rely on intubation rather than mortality outcomes.
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