The log was analyzed for the reported date and time of the event.An entry was found indicating that due to an uncalibrated peep/pmax valve automatic ventilation could not be started.In this case the a "ventilator failure" alarm will be posted as initially reported.Manual ventilation is still possible.The device was inspected on-site and the reported symptom could be verified.The peep valve assembly was identified as root cause and was replaced in consequence.Afterwards, the device was tested and confirmed to be operationg per manufacturer's specification.The device has reacted on the detected situation as specified by not allowing to start an automatic ventilation sequence accompanied by a corresponding alarm.The number of similar cases, related to the same root cause, is within the expected range of the respective risk assessment and thus accepted.Based on the investigation results, the case was reassessed and categorised as non-reportable as for the current case automatic ventilation could not be started and consequently no peep drop is possible.
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