Vyaire medical file identification: (b)(4).At this time, the suspect device has not been returned for evaluation.Therefore, root cause has not been determined yet.Contributing more to map then the bias flow/adjust knob, these settings are extremely out of the ordinary and to restart the unit they would have to increase the bias flow to restart because map has to be at least 20% of upper thumbwheel to start the unit and with these settings it is next to impossible to start the unit without manipulating the bias flow.Vyaire medical will submit a supplemental report in accordance with 21 cfr section 803.56 if additional information was received.
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