Why is driving pressure important in ARDS management?

Driving pressure (ΔP = plateau pressure − PEEP) reflects the pressure required to deliver a tidal volume to the aerated lung and is a surrogate for tidal strain applied to functional lung units. In a landmark meta-analysis by Amato et al. (NEJM 2015), ΔP was the ventilatory variable most strongly associated with survival — each 1 cmH2O increase in ΔP above 15 was associated with increased mortality even after adjusting for tidal volume and PEEP.

How should ventilator settings be adjusted based on driving pressure?

Target driving pressure ≤15 cmH2O (ideally ≤13 cmH2O). If ΔP is elevated, first reduce tidal volume (target 4–6 mL/kg predicted body weight). Increasing PEEP — if it recruits collapsed lung and increases respiratory system compliance — will also reduce ΔP. If tidal volume reduction and PEEP optimization fail to achieve ΔP ≤15, consider prone positioning or neuromuscular blockade to reduce spontaneous respiratory effort-driven lung injury.

Ventilator Driving Pressure Calculator

Calculate ventilator driving pressure (plateau pressure minus PEEP) as a key marker of lung stress in ARDS. Driving pressure ≤15 cmH2O is associated with improved survival.

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Frequently Asked Questions

Why is driving pressure important in ARDS management?

How should ventilator settings be adjusted based on driving pressure?