(b)(4).The device was not returned to edwards for evaluation.Attempts to retrieve the device and additional information are in process.The device history record (dhr) review could not be performed as the serial number is unknown.Without additional information the clinical observation cannot be confirmed and cause remains indeterminable.If additional information is received a supplemental mdr will be submitted.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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