[Malfunction of equipment by the addition of a bacterial filter in the expiratory branch of the respiratory circuit].
The addition of a continuous Flow System to the circuit of a volume cycled respirator results in an additional IMV option and shows excellent performance for this purpose. The insertion of a bacterial filter into this modified circuit resulted in a dangerous increase of airway pressures after 54 "running hours" for that filter. Test series revealed an insufficient air transmission through the filter, caused by the water vapour-saturated inspiratory gas mixture, which is necessary in long term ventilation. Furthermore it was demonstrated that wet bacterial filters cause malfunction of SIMV systems due to interference with the demand valve responsible for proper air supply. The routine use of a bacterial filter placed in the expiratory branch results in higher risks in an already risky artificial ventilation system and use-nonuse relationships seem to be questionable.
D000328:Adult; D004868:Equipment Failure; D005374:Filtration / Q000295:instrumentation*; D006801:Humans; D008297:Male; D012123:Pulmonary Ventilation; D012131:Respiratory Insufficiency / Q000628:therapy*; D012306:Risk; D012122:Ventilators, Mechanical; D014947:Wounds and Injuries / Q000150:complications*
Störung der Gerätefunktion bei Anbringung eines Bakterienfilters in den Exspirationsschenkel des Beatmungssystems.