Cardiac Implantable Electronic Device Reutilization

Battery Life of Explanted Devices at a Tertiary Care Center

Lindsey Gakenheimer, B.S.; Joshua Romero, M.D.; Timir S. Baman, M.D.; Dan Montgomery, B.S.; Cydni A. Smith, B.A.; Hakan Oral, M.D.; Kim A. Eagle, M.D.; Thomas Crawford, M.D.


Pacing Clin Electrophysiol. 2014;37(5):569-575. 

In This Article


A retrospective chart review was performed on all CIEDs explanted at the University of Michigan from January 2007 until January 2011. Device parameters such as make, model, serial number, battery voltage, percent pacing, pacing thresholds, lead impedances, and time to charge, when applicable, were collected. Parameters were obtained at the time of, or within 3 months prior to, CIED explantation. Patient demographics and clinical data were also collected, including age, sex, and indication for device implantation and explantation. Criteria for a "reusable" device were >75% of the original battery life or ≥48 months remaining and freedom from device recall or failure. Battery longevity of Medtronic Inc. (Minneapolis, MN, USA) ICDs and pacemakers utilizing an ICD interrogation platform was estimated by using the date of implant and battery voltage as provided by Medtronic Technical Services (personal communication, January 26, 2010). Battery longevity of some Guidant/Boston Scientific devices (Guidant Corp., St. Paul, MN, USA; Boston Scientific, Natick, MA, USA) are expressed in descriptive terms: BOL (beginning of life)/GOOD/OKAY/ERI (elective replacement indicator) and as a "fuel gauge." Voltages for these devices were not included in the analysis. All of the BOL devices were considered reusable. Any device that was GOOD or OKAY was considered reusable only if the fuel gauge showed 75% or greater of the original battery life.