Driving Pressure (ΔP) Calculator
The cyclic pressure the aerated lung actually sees each breath — the ventilator variable most strongly tied to survival in ARDS, with the protective target and what to do when it is high.
Written by Apex Respiratory Editorial Team
Use total PEEP (set + auto-PEEP) when trapping is present.
Enter to also compute static compliance.
Enter plateau pressure and PEEP to calculate the driving pressure. Tidal volume is optional.
Reading driving pressure
ΔP normalizes tidal volume to the size of the aerated (“baby”) lung via compliance (ΔP = VT ÷ Cstat), so it captures the stress per breath better than tidal volume or plateau pressure alone.
In Amato’s analysis it was the ventilator variable most strongly associated with survival in ARDS — a high ΔP predicts mortality even when VT and plateau look acceptable; keep it ≤ 14–15 cmH₂O.
To lower ΔP, reduce tidal volume toward 4–6 mL/kg PBW or titrate PEEP to recruit lung (a true recruiter improves compliance and lowers ΔP); plateau pressure should also stay ≤ 30 cmH₂O.
Educational use only. This material supports respiratory therapy education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional protocols, or physician orders. Always follow facility policies and current provider orders, and verify calculations independently before clinical use.
Sources
- Amato MBP, Meade MO, Slutsky AS, et al. Driving pressure and survival in the acute respiratory distress syndrome. N Engl J Med. 2015;372(8):747-755.
- Kacmarek RM, Stoller JK, Heuer AJ. Egan's Fundamentals of Respiratory Care. 12th ed. Elsevier; 2021.