![]() ![]() We conclude that the performance of the GE Aisys CS 2 APL valve does not allow safe bag-assisted ventilation of a patient's lungs. Airway pressure values measured in the Draeger Fabius were never higher than those set by the APL valves, whereas in the GE Aisys CS 2, they considerably exceeded set pressures (by up to 27 cmH 2O). Airway pressures in the Draeger Fabius APL valves demonstrated a near linear increase and decrease. With further closure of the GE Aisys CS 2 APL valves up to 20 cmH 2O, inspiratory tidal volumes decreased to ~50% of the highest values measured. In both lung models, the GE Aisys CS 2 APL valves demonstrated non-linear behaviours for airway pressures and for inspiratory tidal volumes, with a sharp increase at set APL pressure levels of 8–10 cmH 2O. Airway pressures and inspiratory tidal volumes were measured using an ASL-5000 test lung and a GE Aisys CS 2 near-patient spirometry sensors. We compared the performance of the APL valves of the GE Aisys CS 2 and the Draeger Fabius anaesthetic machines during closure and opening from 1-20 and from 20-1 cmH 2O, using standardised experimental baby and adolescent patient lung models. The ability to gently ventilate a patient's lungs using a self-inflating bag requires a properly working adjustable pressure-limiting (APL) valve. ![]()
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