Effect of Ventilator Settings on Mechanical Power During Simulated Mechanical Ventilation of Patients With ARDS

Effect of Ventilator Settings on Mechanical Power During Simulated Mechanical Ventilation of Patients With ARDS

In recent years, mechanical power (MP) has emerged as an important concept that can significantly impact outcomes from mechanical ventilation. Several individual components of ventilatory support such as tidal volume (V ), breathing frequency, and PEEP have been shown to contribute to the extent of...

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Bibliographic Details
Published in:Respiratory care Vol. 69; no. 4; pp. 449 - 462
Main Authors: El-Khatib, Mohamad F, Zeinelddine, Salah M, HajAli, Thuraya H, Rizk, Marwan, van der Staay, Matthias, Chatburn, Robert L
Format: Journal Article
Language:English
Published: United States Daedalus Enterprises, Inc 01-04-2024
Subjects:
Acute respiratory distress syndrome
Artificial respiration
Care and treatment
Humans
Lung
Medical research
Medicine, Experimental
Methods
Physiological aspects
Respiration, Artificial - methods
Respiratory Distress Syndrome - therapy
Tidal Volume
Ventilators
Ventilators, Mechanical
United States
medical simulation
tidal volume
mechanical ventilation
breathing frequency
ARDS
mechanical power
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Summary:In recent years, mechanical power (MP) has emerged as an important concept that can significantly impact outcomes from mechanical ventilation. Several individual components of ventilatory support such as tidal volume (V ), breathing frequency, and PEEP have been shown to contribute to the extent of MP delivered from a mechanical ventilator to patients in respiratory distress/failure. The aim of this study was to identify which common individual setting of mechanical ventilation is more efficient in maintaining safe and protective levels of MP using different modes of ventilation in simulated subjects with ARDS. We used an interactive mathematical model of ventilator output during volume control ventilation (VCV) with either constant inspiratory flow (VCV-CF) or descending ramp inspiratory flow, as well as pressure control ventilation (PCV). MP values were determined for simulated subjects with mild, moderate, and severe ARDS; and whenever MP > 17 J/min, V , breathing frequency, or PEEP was manipulated independently to bring back MP to ≤ 17 J/min. Finally, the optimum V -breathing frequency combinations for MP = 17 J/min were determined with all 3 modes of ventilation. VCV-CF always resulted in the lowest MPs while PCV resulted in highest MPs. Reductions in V were the most efficient for maintaining safer and protective MP. At targeted MPs of 17 J/min and maximized minute ventilation, the optimum V -breathing frequency combinations were 250-350 mL for V and 32-35 breaths/min for breathing frequency in mild ARDS, 200-350 mL for V and 34-40 breaths/min for breathing frequency in moderate ARDS, and 200-300 mL for V and 37-45 breaths/min for breathing frequency for severe ARDS. VCV-CF resulted in the lowest MP. V was the most efficient for maintaining safe and protective MP in a mathematical simulation of subjects with ARDS. In the context of maintaining low and safe MPs, ventilatory strategies with lower-than-normal V and higher-than-normal breathing frequency will need to be implemented in patients with ARDS.
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ISSN:0020-1324
1943-3654
1943-3654
DOI:10.4187/respcare.11470