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Ventilation of a Lung Model with the Engström Respirator: The Effect of Different Respirator Settings on Gas Distribution

The influence on gas distribution of different respirator settings was studied in a two compartment lung model. A volume‐limited respirator with an accelerating gas flow pattern was used. An increase in respiratory frequency resulted in a less uniform ventilation even after redistribution of gas had occurred. Increased minute volume caused a more uneven ventilation due to reduced possibilities of redistribution. The gas acceleration and the flow maximum were increased by raising the pressure in the driving system of the ventilator. Only slight and indecisive effects on gas distribution were observed in so doing. No correlation between maximum inspiratory flow rate and gas distribution was found. Impedance, which is frequency dependent, is considered to cause the variations in gas distribution, whereas the flow characteristics seem to have less influence on the uniformity of ventilation.