Mechanical power in mechanical ventilation: Physiologic basis, evidence, and clinical implications

Shunsuke Kondo, Austin Corpuz, Collin Clarke, Scott Nishioka, Shun Nakahara, Ehab G Daoud, Brent Matsuda

Abstract

Invasive mechanical ventilation is a cornerstone of supportive care for patients with acute respiratory failure and acute respiratory distress syndrome (ARDS), yet ventilator-induced lung injury (VILI) remains a major contributor to morbidity and mortality. Conventional lung-protective strategies have focused on limiting individual ventilatory variables such as tidal volume, driving pressure, and plateau pressure, but these parameters incompletely capture the cumulative mechanical burden imposed on the lung. Mechanical power has emerged as an integrative concept that quantifies the total energy transferred from the ventilator to the respiratory system per unit time, incorporating tidal volume, airway pressures, inspiratory flow, respiratory rate, and positive end-expiratory pressure.

This narrative review summarizes the physiologic basis of mechanical power, methods for bedside calculation, and current experimental and clinical evidence linking mechanical power to lung injury and patient outcomes. Preclinical studies consistently demonstrate that increasing mechanical power exacerbates structural lung damage and inflammation, even when individual ventilatory variables remain within conventionally accepted ranges. Observational clinical studies across diverse populations including ARDS, acute hypoxemic respiratory failure, and general ICU cohorts have shown robust associations between higher mechanical power and increased mortality, prolonged mechanical ventilation, and longer ICU stay. Reported risk ranges commonly fall between 14 and 18 J/min, although no universal safe threshold has been established.

Important limitations remain. Mechanical power is typically calculated at the level of the respiratory system and does not fully account for heterogeneity in lung size, regional stress distribution, or the fraction of energy dissipated within vulnerable lung units. Normalization to predicted body weight, respiratory system compliance, or aerated lung volume appears to improve prognostic discrimination, supporting a personalized interpretation aligned with the “baby lung” concept. Moreover, emerging data suggest that time-varying and cumulative exposure to high mechanical power may be more relevant than single time-point measurements.

In conclusion, mechanical power provides a coherent, energy-based framework for interpreting ventilatory intensity and VILI risk. At present, it should be viewed as a complementary biomarker rather than a validated therapeutic target. Future research should focus on injury-relevant energy metrics, optimal normalization strategies, and randomized trials testing protocolized mechanical power–guided ventilation strategies.

Keywords: Mechanical power, VILI, ARDS

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