The electronic log file was available for investigation.As the device has been used since the reported event, the user log entries for the reported date of event have already been overwritten.However, analysis of the error log confirmed the reported event in general.At 14:40:57 on the reported date of event, the device detected a power fail, performed a warm start and switched to safety mode.At 14:41:04 a change of ventilation settings is logged.This change is made by the device in accordance with the specification by switching to man/spont.At 14:42:12, a power cycle and an error-free post (power on self test) are recorded.There wasn't any failure of the device detected during this test.Based on all available information the exact root cause could not be determined, but it is seen likely that the battery was not suffiently charged when mains power failed.Even with a swithed-off device, manual ventilation with up to 12l/min o2 and volatile anesthetic agent remains possible to continue the case.
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