A simple method to estimate flow restriction for dual ventilation of dissimilar patients: The BathRC model

PloS One
Andrew R PlummerHarinderjit S Gill

Abstract

With large numbers of COVID-19 patients requiring mechanical ventilation and ventilators possibly being in short supply, in extremis two patients may have to share one ventilator. Careful matching of patient ventilation requirements is necessary. However, good matching is difficult to achieve as lung characteristics can have a wide range and may vary over time. Adding flow restriction to the flow path between ventilator and patient gives the opportunity to control the airway pressure and hence flow and volume individually for each patient. This study aimed to create and validate a simple model for calculating required flow restriction. We created a simple linear resistance-compliance model, termed the BathRC model, of the ventilator tubing system and lung allowing direct calculation of the relationships between pressures, volumes, and required flow restriction. Experimental measurements were made for parameter determination and validation using a clinical ventilator connected to two test lungs. For validation, differing amounts of restriction were introduced into the ventilator circuit. The BathRC model was able to predict tidal lung volumes with a mean error of 4% (min:1.2%, max:9.3%). We present a simple model validated model...Continue Reading

References

Aug 4, 2006·Academic Emergency Medicine : Official Journal of the Society for Academic Emergency Medicine·Greg Neyman, Charlene Babcock Irvin
Aug 25, 2009·Medical Engineering & Physics·A J WilsonD G Tilley
Jun 1, 2011·Biophysics Reviews·Alysson Roncally Carvalho, Walter Araujo Zin
Oct 19, 2017·Respiratory Care·Jean-Michel ArnalRobert L Chatburn

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Citations

Mar 28, 2021·European Journal of Medical Research·Andreas BauerJens Heyn

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Software Mentioned

MATLAB
Vent Tester
Aisys CS 2
BathRC

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