Mechanical power in ASV® versus pressure-controlled ventilation


A recent study showed the mechanical power of ventilation transferred to the patient is lower in ASV than in pressure-controlled ventilation.

The single-center, observational prospective pilot study included 24 passive, critically ill patients being ventilated invasively in either Adaptive Support Ventilation (ASV) or pressure-controlled ventilation mode. In ASV, caregivers set PEEP and FiO2, while all other settings were controlled by the ventilator. In pressure-controlled ventilation, caregivers set maximum airway pressure (Pmax), PEEP, FiO2 and respiratory rate. Results showed that the mechanical power of ventilation in ASV was significantly lower than in pressure-controlled ventilation (15.1 [10.5–25.7] vs 22.9 [18.7–28.8] J/min; p = 0.04). This difference was due to lower Pmax and respiratory rate as opposed to tidal volume, which did not differ between the two groups. The authors concluded that in comparison to pressure-controlled ventilation, ASV may be beneficial in terms of how much mechanical power of ventilation is transferred from the ventilator to the respiratory system in these patients.

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Buiteman-Kruizinga LA, Mkadmi HE, Schultz MJ, Tangkau PL, van der Heiden PLJ. Comparison of Mechanical Power During Adaptive Support Ventilation Versus Nonautomated Pressure-Controlled Ventilation-A Pilot Study. Crit Care Explor. 2021;3(2):e0335. Published 2021 Feb 15. 

Date of Printing: 18.05.2021
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