Boston scientific received information that during a follow-up appointment, there was a stored episode with this cardiac resynchronization therapy defibrillator (crt-d) and right ventricular (rv) lead which indicated noise and oversensing.The noise was able to be reproduced with isometrics/pocket maneuvers.Subsequently, the patient had surgery and received a new tricuspid valve and a new mitral valve.During surgery, the rv, the left ventricular (lv) lead and the device were removed.A new rv and lv epicardial leads were implanted.A new pacemaker was also implanted.The patient planned to receive a subcutaneous implantable cardioverter defibrillator (s-icd) at a later date.No additional adverse patient effects were reported.
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Upon receipt at our post market quality assurance laboratory, a thorough evaluation of the device was performed.A visual inspection of the device header and case noted no anomalies.Pin gauge testing, designed to verify proper port dimensions, was completed.Each port measured as expected.The device was then exposed to simulated heart load conditions, and the defibrillation, pacing, and sensing functions were tested.Impedance testing was completed and all measurements were within normal limits.The device operated appropriately with no interruptions in therapy output at the returned programmed settings.A series of electrical tests was also performed, and again, normal device function was observed.Analysis did not identify any device characteristics that would have caused or contributed to the reported clinical observations.
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