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As reported by the field clinical specialist (fcs), during implant of a 29mm sapien 3 valve and 29mm alterra present in the pulmonic position, the patient's deep septum at the bifurcation led to an ideal distal alterra placement, several different approaches were made to achieve this.The team switched from right pulmonary artery (rpa) to the left pulmonary artery (lap) with both lunderquist and super stiff wires in both positions while trying to deploy the alterra because it ended up too proximal and wanted to open posteriorly, inverting the struts.A second system was opened after 3 attempts and they switched to a softer wire successfully deploying the alterra in the most ideal position.(shorter mpa, reviewed and deemed favorable) after valve deployment, the entire system migrated into the right ventricle (rv) due to poor engagement at the proximal portion and the patient had to go to surgery.
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A supplemental mdr is being submitted for a completion to the engineering evaluation.The product was not returned; therefore, a no product return investigation was completed.As a device was not returned, visual inspection, functional testing, and dimensional testing were unable to be done.The provided 3mensio report was evaluated and no relevant information was provided to this case as the 3mensio did not show the alterra prestent migration.As no device was returned and there is no evidence to support a manufacturing/design defect potentially contributed to the complaint, a manufacturing mitigation review is not required.The alterra adaptive prestent system ifu was reviewed.Potential adverse events include, 'device migration or malposition'.A review of edwards lifesciences risk management documentation was performed for this case.Current risk mitigations include design and manufacturing controls, ifu warnings and cautions, and physician training.No evidence of product non-conformances or labeling/ifu inadequacies were identified in the evaluation.' the complaint for prestent migrated was unable to be confirmed as no applicable imagery or device returned for evaluation.As the device was not returned, engineering was unable to perform any visual examination, functional testing, or dimensional analysis.Therefore, the presence of a manufacturing non-conformance was unable to be determined.However, review of the dhr and lot history did not provide any indication that a manufacturing non-conformance would have contributed to the complaint event.A review of ifu/training materials revealed no deficiencies.Furthermore, no abnormalities were reported during device unpacking or preparation.As reported, 'a 2nd system was opened after 3 attempts and they switched to a softer wire successfully deploying the alterra in the most ideal position.(shorter mpa, reviewed and deemed favorable) after valve deployment, the entire system migrated into the right ventricle (rv) due to poor engagement at the proximal portion and the patient had to go to surgery.' the ifu warns that correct sizing of the prestent into the rvot is essential to minimize risks such as paravalvular leak, migration, embolization, and/or rvot rupture.Per the training manual, the alterra apices are designed to engage with anatomy to assist in initial placement and acute stability.Inflow apices engagement is critical for prestent fixation and to avoid migration.It is possible that the prestent was migrated due to poor apices engagement at proximal portion as reported.As such, available information suggests that patient factors (poor apices engagement due to patient anatomy) may have contributed to the complaint event.Per the assessment, it has been determined that no capa, scar, or pra is required as the established triggers have not been met.Complaint histories for all reported events are reviewed against trending control limits on a monthly basis, and any excursions above the control limits are assessed and documented as part of this monthly review.
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