Malfunction of the Expiratory Valve During Spontaneous Ventilation.

The integrity of inspiratory and expiratory unidirectional valves is very important in the normal functioning of an anesthetic circle breathing system. We describe our experience of an emergency manipulation of a ceramic valve disk of a circle breathing system (Drager Fabius GS, Drager Medical Inc) that altered its characteristics and led to rebreathing only during spontaneous ventilation.