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E1.Reporter name and address.Address - line 1: no.(b)(6).H11.Additional manufacturer narrative: the device was not returned for evaluation, as the device request is ongoing.The investigation is still in progress; therefore, a conclusion has yet to be established.A supplemental report will be submitted accordingly upon investigation completion.Edwards will continue to review and monitor all reported events.Trends are monitored on a monthly basis and if action is required, appropriate investigation will be performed.
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Edwards received notification from taiwan that this 7300tfx29 valve implanted in the mitral position was explanted after an implant duration of (7) years and (8) months due to calcification leading to mitral stenosis (mean gradient 20.32 mmhg, valve area 0.7 cm2).As reported, patient was noted as to be in stable condition.
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Additional, corrected or updated information.H6: device code, type of investigation, investigation findings and investigations conclusions.The valve was returned for evaluation: customer report of calcification leading to stenosis was confirmed.X-ray demonstrated wireform intact and moderate calcification on all three leaflets.Extrinsic calcific deposits were observed on the outflow surfaces of all three leaflets.Moderate host tissue overgrowth encroached onto the tissue and into the orifice on leaflet 2 at the outflow aspect.The free margin of leaflet 2 was rolled towards the outflow aspect due to host tissue overgrowth.Calcification restricted leaflet mobility and led to stenosis.Sewing ring cloth had multiple cuts around the valve.Svd is a logical and expected consequence of the chemical, mechanical, and immunological processes associated with bhv implantation.The common endpoint of all these factors is calcification and degradation.Svd is an acquired condition, intrinsic to bioprosthetic valves, characterized by deterioration of the leaflets or supporting structures, leading to thickening, calcification, tearing, or disruption of the prosthetic valve materials.These changes result in valvular dysfunction manifesting as stenosis and/or regurgitation with a consequent drop in hemodynamic efficacy of the valve.Despite the advancements in the heart valve industry, svd commonly begins 7- 8 years after implantation, with a considerably increased rate in patients with pertinent comorbidities and/or an implant duration of greater than 10 years.Prior investigations and extensive literature review have shown that svd is predominantly related to patient factors and implant duration rather than to manufacturing issues.Events related to device design, manufacturing, or use error tend to manifest at an earlier implant duration.There is no evidence to suggest a manufacturing defect caused or contributed to the reported event.Based on the information available, the most likely root cause is patient factors, including an implant duration of 7 or more years.By other hand, pannus is a non-immune inflammatory reaction of the body to the implanted prosthesis, characterized by proliferation of fibroelastic tissue and collagen, with a starting point in the suture area and subacute or chronic centripetal evolution.Pannus can have both beneficial and harmful effects depending on the amount of growth and location.A small amount of host tissue growth over the suture line is expected and is needed to form a non-thrombogenic surface and complete the healing process after device implantation.In contrast, an excessive amount of pannus growth can cause nonstructural dysfunction that may require intervention.Host tissue growth can extend onto the cusp surfaces leading to thickening of the cusps, cusp retraction or curling, leaflet immobility, and/or abnormal coaptation, potentially resulting in valvular regurgitation, elevated gradients, and/or stenosis.Pannus/host tissue overgrowth is most likely due to patient factors and is unlikely to be related to a manufacturing non-conformance.
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