Mechanical power at a glance: a simple surrogate for volume-controlled ventilation

Area of Science:

• Mechanical ventilation
• Pulmonary physiology
• Critical care medicine

Background:

• Mechanical power is a key factor in ventilator-induced lung injury (VILI).
• Existing formulas for mechanical power are complex, hindering clinical application.
• A simplified equation is needed for routine use in mechanical ventilation.

Purpose of the Study:

• To develop and validate a simple equation for estimating mechanical power during volume-controlled ventilation.
• To assess the accuracy of the proposed equation compared to a reference formula.
• To facilitate the clinical use of mechanical power in preventing VILI.

Main Methods:

• A novel, simple equation for mechanical power was derived for volume-controlled ventilation.
• The equation's components (VE, F, PEEP, peak pressure) are readily available on ventilators.
• Accuracy was tested against a reference formula in mechanically ventilated pigs and ICU patients.

Main Results:

• The new equation showed high correlation with the reference formula (R² 0.97–0.99) in both animal and human cohorts.
• Bland-Altman analysis revealed minimal bias and proportional errors between the two equations.
• The proposed formula provides a reliable and straightforward estimation of mechanical power.

Conclusions:

• The developed equation offers a simple and accurate method for calculating mechanical power in volume-controlled ventilation.
• It requires no special ventilator maneuvers, allowing for easy integration into clinical practice.
• Wider adoption of this tool could enhance clinician awareness and utilization of mechanical power for VILI prevention.