The device was not returned to edwards for evaluation as it remains implanted.Attempts to retrieve additional information have been unsuccessful.If additional information is received a supplemental mdr will be submitted.The device history record (dhr) review could not be performed as the serial number is unknown.The cause of the event cannot be determined.Edwards will continue to review and monitor all events.Trends are monitored on a monthly basis and if action is required, appropriate investigation will be performed.
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