Question
What factors indicate the need to transition from noninvasive to invasive ventilation?
Answer
What factors indicate the need to transition from noninvasive to invasive ventilation?
While noninvasive ventilation is often preferred to avoid the risks of intubation, there are situations where transitioning to invasive ventilation is the safer choice. The decision typically hinges on the ability to maintain stable mean airway pressure (MAP) sufficient to keep the alveoli inflated and preserve functional residual capacity (FRC). If MAP is too low or unstable, even a noninvasive strategy can lead to lung instability, collapse, and long-term injury. In some cases, early intubation combined with lung-protective settings—low pressure, low volume—and adjunctive therapies such as surfactant can stabilize the lung and facilitate eventual extubation.
A compelling example involves a 24-week preterm infant who was managed exclusively on nasal prongs for 24 days. Despite careful adjustments, the team could not maintain adequate ventilation, and the infant ultimately required intubation. The first post-intubation chest X-ray revealed chronic lung disease, a result of insufficient MAP during the prolonged noninvasive course. This underscores that “noninvasive” ventilation, while free of an endotracheal tube, is not physiologically harmless if it fails to provide adequate support.
The key takeaway is that noninvasive ventilation works best when it delivers stable, adequate pressure, flow, and ventilation. If these cannot be achieved noninvasively, delaying intubation may increase the risk of lung injury. Recognizing the point of failure and transitioning promptly can protect lung function and improve outcomes.
This Ask the Expert is an edited excerpt from the course, MAP vs. NAP: The Impact of Mechanical Ventilation on Hemodynamics, presented by Evan Richards, Advanced Practice Clinical Consultant, BSc, RT.
