What is the primary goal of lung-protective ventilation in ARDSnet using a low tidal volume?

What is the primary goal of lung-protective ventilation in ARDSnet using a low tidal volume?

• A. Minimize volutrauma and barotrauma; tidal volume around 6 ml/kg PBW
• B. Maximize alveolar recruitment with high tidal volumes
• C. Improve patient comfort at all costs
• D. Decrease oxygenation to allow lower FiO2

Answer: (A)

Protecting the injured lung from additional ventilation-induced damage is the main idea. Using a low tidal volume, about 6 ml per kilogram of predicted body weight, limits how much the alveoli are stretched with each breath. This reduces volutrauma from overdistension and barotrauma from high pressures, which are key contributors to ventilator-induced lung injury in ARDS. Because ARDS lungs are uneven—some areas are stiff while others are prone to overdistension—keeping tidal volumes small helps prevent injury across the whole lung. Calibrating volume to predicted body weight (not actual weight) ensures the volume matches the patient’s lung size. Sometimes this approach means accepting some elevated CO2 (permissive hypercapnia) to protect the lungs, rather than forcing higher volumes. Other ideas, like using high tidal volumes to recruit more alveoli, aiming for maximum comfort at the expense of lung protection, or lowering oxygenation to justify very low FiO2, do not align with the goal of minimizing lung injury through gentle ventilation.

Protecting the injured lung from additional ventilation-induced damage is the main idea. Using a low tidal volume, about 6 ml per kilogram of predicted body weight, limits how much the alveoli are stretched with each breath. This reduces volutrauma from overdistension and barotrauma from high pressures, which are key contributors to ventilator-induced lung injury in ARDS. Because ARDS lungs are uneven—some areas are stiff while others are prone to overdistension—keeping tidal volumes small helps prevent injury across the whole lung. Calibrating volume to predicted body weight (not actual weight) ensures the volume matches the patient’s lung size. Sometimes this approach means accepting some elevated CO2 (permissive hypercapnia) to protect the lungs, rather than forcing higher volumes. Other ideas, like using high tidal volumes to recruit more alveoli, aiming for maximum comfort at the expense of lung protection, or lowering oxygenation to justify very low FiO2, do not align with the goal of minimizing lung injury through gentle ventilation.