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Mechanical Power Is Associated With Mortality in Pressure-Controlled Ventilated Patients: A Dutch, Single-Center
Jamilla Goedegebuur1, Floor E Smits2, Jacob W M Snoep2
1Department of Thrombosis and Hemostastis, Leiden University Medical Centre, Leiden, The Netherlands.
Critical Care Explorations
|December 19, 2024
Summary
Mechanical power (MP) in mechanical ventilation is linked to higher hospital mortality, especially when exceeding 16-18 J/min. Normalized MP shows an even stronger association with adverse outcomes.
Area of Science:
- Critical Care Medicine
- Respiratory Physiology
- Mechanical Ventilation
Background:
- Mechanical power (MP) is a potential predictor of adverse outcomes in mechanical ventilation.
- Safety thresholds for MP are not well-established.
- Understanding MP's role across different lung disease severities is crucial.
Purpose of the Study:
- To investigate the association between mechanical power (MP) and hospital mortality.
- To analyze this association across varying degrees of lung disease severity (Pao2/Fio2 ratios).
Main Methods:
- Retrospective cohort study utilizing automatically extracted ICU data.
- Inclusion of patients ventilated in pressure-controlled mode.
- Logistic regression adjusted for age, sex, APACHE-IV, and Pao2/Fio2 ratio to determine odds ratios for mortality.
Main Results:
- 2184 patients analyzed; mean age 62.5 years, 70.2% male.
- Higher MP observed in patients with lower Pao2/Fio2 ratios (21.5 J/min vs. 12.0 J/min).
- Increased MP associated with higher mortality (OR 1.06 per J/min increase); normalized MP stronger (OR 1.004 per J/min/kg). Mortality increased above 16-18 J/min.
Conclusions:
- Significant association found between mechanical power and hospital mortality, independent of confounders.
- Mechanical power exceeding 16-18 J/min is linked to increased mortality.
- Normalized MP demonstrates a stronger association, suggesting its importance in ventilation strategies.
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