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PubMed · 2069237

Inspiratory work imposed by demand valve ventilator circuits.

T E Oh·E S Lin·S Bhatt
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Abstract

The inspiratory work (WI) imposed by three commonly used demand valve ventilator circuits was studied using a lung model to simulate spontaneous ventilation. The CPU-1 and Engstrom Erica circuits recorded WI of 379 mJ/l and 190 mJ/l respectively. A negative WI of -32 mJ/l was recorded for the Servo 900C, denoting that the circuit performed work on the lung. The demand valves recorded a time delay between inspiratory effort and onset of gas flow, of 300 ms (CPU-1), 190 ms (Servo 900c) and 160 ms (Engstrom Erica). Both the Servo 900C and Engstrom Erica demand valves were able to generate a high inspiratory gas flow response, but the CPU-1 lacked such a flow compensation. Expiratory work was also greatest with the CPU-1 (156 mJ/l) with 141 mJ/l and 90 mJ/l recorded for the Servo 900C and Engstrom Erica. Of the three ventilators studied, the Servo 900C appears to be the ventilator circuit of choice for spontaneous ventilation.

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HumansLungModels, StructuralVentilators, MechanicalWork of BreathingJournal Article

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BibTeXRIS

T E Oh, E S Lin, S Bhatt. 1991. Inspiratory work imposed by demand valve ventilator circuits.. https://doi.org/10.1177/0310057x9101900205

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