The device was inspected by a dräger service technician who replaced the blower unit and the peep valve drive and downloaded the electronic log file.Both was available for further investigation.The analysis of the returned parts has not revealed any failure.Within a two week endurance run the parts were operating properly.However, based on the information stored in the log the reported event could be reconstructed.During the case in question the device repeatedly detected significant deviations between the measured inspiratory and expiratory flow.Such deviation clearly indicates a huge leak within the patient system (connection of breathing hoses, tube, y-piece, etc.).The device generated corresponding alarms such as minute volume low, apnoe, fresh gas low or leak.The investigation has not revealed a device failure.The reported resetriction of ventiltion was caused by a relevant external leak.The device was tested and returned to use.
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