The log file was available for investigation.Negative pressure (up to -17 hpa) and positive pressure peaks (up to 98 hpa) were logged.Due to a too fast and too high pressure increase the ventilator performed an emergency shutdown while autonomously changing mode to man/spont and generating a ventilator fail alarm.Possibly a suction system was used.It¿s also conceivable, that the patient was coughing at the time of event.The logfile analysis has shown no indications for a technical malfunction.Root cause for the reported symptom was an overpressure at the patient end of the circuit leading to a pressure peak and thus to an emergency shutdown of the ventilator.The device reacted as specified with an autonomous shutdown of the ventilator and alarmed audible and visible for ventilator fail while autonomously changing to manual ventilation (man/spont).Manual ventilation remained unaffected, as specified.
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