Calculation of mechanical power for pressure-controlled ventilation
The mechanical power (MP) is a single variable encompassing important ventilator-related causes of lung injury that can be calculated using a set of parameters routinely measured during volume-controlled ventilation (VCV) . A recent analysis of two large databases revealed that high MP is independently associated with mortality in critically ill patients on mechanical ventilation . As the equation for calculation of MP used for these analyses is based on the assumption of VCV with a linear rise of airway pressure (Paw) during inspiration, it is not suitable for calculating MP during pressure-controlled ventilation (PCV) . Here, we describe two equations for estimating MP during PCV and assess their validity in patients ventilated with this mode.
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Conflicts of interest
Tobias Becher and Dirk Schädler received lecture fees from Drägerwerk AG & Co. KGaA (Lübeck, Germany). Matthias van der Staay is an employee of imt and works for imtmedical, Buchs, Switzerland. The other authors report no conflicts of interest.