Bedside dynamic calculation of mechanical power: A validation study

• Published in: Journal of critical care Vol. 56; pp. 167 - 170
• Main Authors: Aşar, Sinan, Acicbe, Özlem, Çukurova, Zafer, Hergünsel, G. Oya, Canan, Emral, Çakar, Nahit
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01-04-2020; Elsevier Limited
• Subjects: Aged; Decision Making; Female; Humans; Intensive care; Intensive Care Units; Lung - physiopathology; Male; Middle Aged; Patients; Positive-Pressure Respiration - methods; Positive-Pressure Respiration - standards; Regression analysis; Reproducibility of Results; Respiration; Respiratory Distress Syndrome; Respiratory system; Software; Standard deviation; Structured Query Language-SQL; Tidal Volume; Turkey; Values; Ventilators; Ventilators, Mechanical; Work of Breathing; Workloads; Turkey; Sweden
• ISSN: 0883-9441; 1557-8615
• DOI: 10.1016/j.jcrc.2019.12.027

To develop an equation to calculate the bedside dynamic mechanical power (MPdyn) for modern ventilators using the Work of Breathing ventilator (WOBv) parameter.
We developed an equation based on mechanical power values, which is equal to WOBv x minute volume. To measure mechanical power with this equation forty adult patients, hospitalized with the diagnosis of Acute Respiratory Distress Syndrome and underwent invasive mechanical ventilation, were used. To be able compare our results with Gattinoni's standart mechanical power equation (MPstd) the contribution of the PEEP was included in our equation. Then results obtained from MPdyn and MPstd were compared using univariable regression and Bland-Altman analysis. This comparison was performed at different I:E ratios, PEEP levels and tidal volumes.
Analysis of the results for each condition showed that MPdyn and MPstd equation correlated with R2 ≥ 0.98. Additionally, there was no statistically significant difference between MPdyn and MPstd for patient power means were 0.04 J/min (p = .42) using Bland-Altman analysis.
Physicians can easily calculate mechanical power by using MPdyn at the bedside of patients on volume control mode.
•The measurement of mechanical power is important for ventilator-induced lung injury.•Dynamic mechanical power (MPdyn) can be used in all ventilation modes.•It is easy to measure mechanical power at bedside with MPdyn.