The device was not returned for evaluation.A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.The reported patient effect of vessel thrombosis is listed in the xact carotid stent system information for prescribers as an adverse event potentially associated with carotid stents and embolic protection systems.A conclusive cause for the reported patient effects, and the relationship to the product, if any, cannot be determined.However, the treatment appears to be related to the operational context of the procedure.There is no indication of a product quality issue with respect to manufacture, design or labeling.
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It was reported that the procedure was performed to treat the right internal carotid artery due to vision loss that the patient was experiencing on the left side, indicating an issue in the right artery with 99% stenosis, none calcification and none tortuosity.An emboshield nav6 embolic protection system (eps) was advanced and the first xact stent (lot 2121461) was implanted by direct stenting in the right internal carotid artery (ica) without issue.The emboshield nav6 was removed.At this time it was noted that the patient had lost movement in the foot and leg on the right side as well as a loss of speech.A clot had formed in the left ica/external carotid artery.An emboshield nav6 (lot 3031661) was attempted to be advanced but could not pass so balloon dilatation was performed with a viatrac balloon and then the emboshield nav6 was able to be advanced to the desired location.Then an xact stent was placed in the left ica and post dilated with the viatrac balloon.Four mg of tissue plasminogen activator (tpa) was administered.Flow to the brain was restored.The stents are patent.There was no diagnosis of stroke or transient ischemic attack.The patient remained hospitalized in the intensive care unit and three days later it was reported that the patient had improved with normal speech, regained right side movement and able to follow commands.The patient will be sent to rehabilitation for recovery.No additional information was provided.
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