Edwards received information that a 28mm bioprosthetic mitral ring, implanted approximately three (3) years and nine (9) months, was explanted due to mitral stenosis and severe pannus overgrowth on the ring.The explanted device was replaced with a 27mm mitral valve.The operative note indicated that the patient had severe coagulopathy following the procedure; however, it was determined to be likely due to the patient's severe right sided congestive heart failure and cardiac cirrhosis.Operative observation revealed host tissue overgrowth on the ring.The patient tolerated the procedure well.
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(b)(4).The device was not returned to edwards for analysis.The reported clinical observation could not be confirmed.Post-operatively, the body undergoes various phases of the tissue response continuum resulting in the fibrous encapsulation of the ring.Local and systemic factors of the patient may play a role in the wound healing and inflammatory responses to biomaterials and implants.In this case, the patient's response to the ring was noted to be vigorous and excessive, contributing to the need for explanation.The device history record was reviewed and showed that this device met all manufacturing specifications prior to product being released for distribution.Edwards will continue to review and monitor all events.Trends are monitored on a (b)(4) basis and if action is required, appropriate investigation will be performed.
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