The BathRC model: a method to estimate flow restrictor size for dual ventilation of dissimilar patients

Andrew R Plummer; Jonathan l du Bois; Siu Man Lee; Patrick Magee; Jens Roesner; Harinderjit S Gill

In Test 2, the fixed restrictor is used for lung 1, and now the flows to and from lung 1 are now smaller than lung 2, as seen in Figure 11a . The tidal volume for lung 1 is now reduced by 22% from its unrestricted state. In Test 3, the adjustable restrictor is used for lung 1 which provide a higher resistance, and the lung 1 flows are reduced further (Figure 12a) , giving a tidal volume reduction of 36% from its unrestricted state. For Tests 1 to 3 there is no change in the parameters for lung 2, so the model predicts the same tidal volume in each case. However, the measured results indicate a slight increase in volume, amounting to an increase of nearly 5% from Test 1 to Test 3 (Table 2) .