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The investigation of this complaint has been completed.The additional information received from the user facility stated that the hospital technician was called in to the operating room at the time of the event.The system was tested on a test lung and ventilation was not possible during the first minutes, but after this the ventilation on the test lung was possible.The breathing circuit and filters used at the time of the event was not changed before the test on the test lung.No further issues have been reported with the system after this and the system has continuously been used.No parts were replaced.The system device logs were sent for evaluation.The evaluation of the device logs shows that a successful system checkout was performed prior to the event.The technical log has no entries during this date, which indicate the absence of technical malfunctions in the system at the time of the event.The log shows that the treatment was started in manual ventilation.Seven minutes after start, the o2 flush button was pushed several times and another three minutes later ,alarms indicating that the measured airway pressure exceeded the set pressure in manual ventilation were generated.The system was set to automatic ventilation in pressure regulated volume control (prvc) mode and alarms indicating a high airway pressure such as regulation pressure limited, high continuous pressure, airway pressure high and peep high were generated.The alarms indicating a high airway pressure was also generated during the first two minutes when the hospital technician tested the system and then the system was functioning without deviations.The combination of the alarms for airway pressure high, peep high and high continuous pressure, indicates an increased expiratory resistance in the breathing system.Our conclusion, based on the evaluation of the logs, is that there was no indication of a system malfunction at the time of the event.The root cause of the reported event has not been conclusively determined.
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