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Average air pressure in assisted ventilation From Wikipedia, the free encyclopedia
Mean airway pressure typically refers to the mean pressure applied during positive-pressure mechanical ventilation. Mean airway pressure correlates with alveolar ventilation, arterial oxygenation,[1] hemodynamic performance, and barotrauma.[2] It can also match the alveolar pressure if there is no difference between inspiratory and expiratory resistance.[3]
There are several equations aimed at determining the real mean airway pressure.
In ventilation with a square flow waveform this equation can be used:
where:
During pressure control ventilation this variant of the equation can be used:
where:
In airway pressure release ventilation (APRV) a variation of the previous equation must be used for the variables:
Mean airway pressure has been shown to have a similar correlation as plateau pressure to mortality.[6]
MAP is closely associated with mean alveolar pressure and shows the stresses exerted on the lung parenchyma on mechanical ventilation.[7]
In high frequency oscillatory ventilation, it has been suggested to set the mean airway pressure six above the lower inflection point on the lungs P-V curve.[8]
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