Ventilator-Induced Lung Injury Mechanisms and Management

Ventilator-induced lung injury arises when mechanical ventilation, while life-saving in acute respiratory failure, imposes abnormal stresses on lung tissue. Excessive tidal volumes or pressures can stretch alveolar units beyond physiological limits (volutrauma and barotrauma), while repetitive opening and closing of unstable alveoli promotes atelectrauma. These mechanical insults trigger a biological response (biotrauma) that releases pro-inflammatory cytokines and damage-associated molecular patterns, further compromising the alveolar–capillary barrier. Resulting pulmonary oedema, surfactant dysfunction and endothelial barrier failure exacerbate gas-exchange impairment and may propagate systemic inflammation. Protective ventilation strategies—including low tidal volume ventilation, optimised positive end-expiratory pressure and recruitment manoeuvres—aim to limit overdistension, maintain alveolar stability and reduce shear stress. In severe or refractory cases, adjuncts such as prone positioning, neuromuscular blockade and extracorporeal membrane oxygenation are employed to offload mechanical forces. Emerging therapeutic approaches seek to modulate molecular mediators of barrier dysfunction and inflammation, restoring endothelial integrity and attenuating cytokine release. A comprehensive understanding of mechanical and biological factors underpins global efforts to prevent and manage ventilator-induced lung injury, improving outcomes in critically ill patients.

Research from Nature Portfolio

Seminal work has revealed that matricellular proteins can amplify inflammatory signalling in ventilator-induced injury. A key study demonstrated that the protein WISP1 binds to αvβ3 integrin on macrophages, potentiating Toll-like receptor 4-driven cytokine release and neutrophil recruitment in the lung. This pathway was shown to increase alveolar–capillary permeability and tissue inflammation, identifying the WISP1–αvβ3 axis as a potential therapeutic target to mitigate both local lung damage and downstream systemic effects.

Ventilator-Induced Lung Injury Mechanisms and Management publication trend

The graph below shows the total number of articles in ventilator-induced lung injury mechanisms and management across all publications each year (not limited to Nature Index journals).

Technical terms

Volutrauma: Lung injury caused by overdistension of alveoli due to excessive tidal volumes during mechanical ventilation.

Barotrauma: Structural damage to lung tissue resulting from high airway pressures that exceed alveolar wall strength.

Atelectrauma: Injury from repetitive collapse and reopening of alveolar units, leading to shear stress and epithelial damage.

Biotrauma: Inflammatory response triggered by mechanical ventilation, characterised by release of cytokines and damage-associated molecular patterns.

Positive End-Expiratory Pressure (PEEP): A ventilator setting that maintains a baseline airway pressure to prevent alveolar collapse at end expiration.

Alveolar–Capillary Permeability: The ease with which fluid and solutes cross the alveolar–capillary barrier; increased permeability leads to pulmonary oedema.

References

1. A long-lasting porcine model of ARDS caused by pneumonia and ventilator-induced lung injury. Critical Care (2023).
2. Effect of antibody-mediated connective tissue growth factor neutralization on lung edema in ventilator-induced lung injury in rats. Molecular Medicine (2024).
3. WISP1-αvβ3 integrin signaling positively regulates TLR-triggered inflammation response in sepsis induced lung injury. Scientific Reports (2016).