Noninvasive Ventilation Strategies in Respiratory Failure Management

Noninvasive ventilation (NIV) encompasses a range of techniques designed to support breathing without the need for endotracheal intubation. By delivering pressurised or high‐flow gas through interfaces such as masks or nasal cannulae, these modalities improve oxygenation, unload respiratory muscles and reduce the work of breathing. Common approaches include continuous positive airway pressure (CPAP), bilevel positive airway pressure (BiPAP) and high‐flow nasal cannula (HFNC) therapy. Physiological benefits derive from alveolar recruitment, provision of positive end-expiratory pressure, washout of anatomical dead space and maintenance of a stable fraction of inspired oxygen. Clinically, NIV strategies are applied to hypoxemic respiratory failure, acute exacerbations of chronic obstructive pulmonary disease, cardiogenic pulmonary oedema, post-extubation support and pandemic-related acute respiratory distress. Adoption of noninvasive techniques has been associated with lower intubation rates, decreased intensive care stay, improved patient comfort and broad applicability in resource-limited settings. Recent advances include helmet interfaces, automated pressure-support algorithms and synchronisation technologies that enhance tolerance and efficacy. As the global burden of respiratory failure evolves—most notably during viral outbreaks—noninvasive strategies continue to play a pivotal role in bridging gaps between conventional oxygen therapy and invasive mechanical ventilation.

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Noninvasive Ventilation Strategies in Respiratory Failure Management publication trend

The graph below shows the total number of articles in noninvasive ventilation strategies in respiratory failure management across all publications each year (not limited to Nature Index journals).

Technical terms

Noninvasive ventilation (NIV): Delivery of ventilatory support through external interfaces without an invasive airway device.

High-flow nasal cannula (HFNC): A system providing warmed, humidified gas at high flow rates via nasal prongs to augment oxygenation and generate mild positive airway pressure.

Positive end-expiratory pressure (PEEP): Pressure maintained in the lungs at end expiration to prevent alveolar collapse and improve gas exchange.

PaO2/FiO2 ratio: The ratio of arterial oxygen tension to the fraction of inspired oxygen, used to assess severity of hypoxemia.

Anatomical dead space: The volume of air in the conducting airways that does not participate in gas exchange.

References

1. Nasal high flow clears anatomical dead space in upper airway models. Journal of Applied Physiology (2015).
2. High-flow nasal cannula oxygen therapy in adults. Journal of Intensive Care (2015).
3. High-flow nasal cannula oxygen therapy is superior to conventional oxygen therapy but not to noninvasive mechanical ventilation on intubation rate: a systematic review and meta-analysis. Critical Care (2017).
4. High-flow nasal oxygen in patients with COVID-19-associated acute respiratory failure. Critical Care (2021).