Mean Airway Pressure Calculator
The Mean Airway Pressure Calculator estimates the average pressure applied to the airways during mechanical ventilation from peak and end-expiratory pressures and the inspiratory-to-expiratory timing.
Formula
MAP = (Ti ÷ (Ti + Te)) × (PIP − PEEP) + PEEP
- Uses the inspiratory time fraction of the respiratory cycle.
- Higher mean airway pressure improves oxygenation but can affect circulation.
PIP 25, PEEP 5, Ti 1 s, Te 2 s
Inputs
- Peak Inspiratory Pressure (PIP): 25 cmH₂O
- PEEP: 5 cmH₂O
- Inspiratory Time: 1 s
- Expiratory Time: 2 s
(1 ÷ 3) × (25 − 5) + 5 = 11.7 cmH₂O.
Frequently asked questions
Why does mean airway pressure matter?
It reflects average lung distending pressure and correlates with oxygenation during mechanical ventilation.