Surgical and electrophysiological considerations in the management of a patient with a subcutaneous implantable cardioverter-defibrillator undergoing.

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Presentation transcript:

Surgical and electrophysiological considerations in the management of a patient with a subcutaneous implantable cardioverter-defibrillator undergoing coronary artery bypass surgery Brett Angel, MD, Jay Overcash, CCDS, Wade Fischer, MD, John M. Fontaine, MD, MBA, FHRS HeartRhythm Case Reports Volume 3, Issue 1, Pages 58-62 (January 2017) DOI: 10.1016/j.hrcr.2016.09.002 Copyright © 2016 Heart Rhythm Society Terms and Conditions

Figure 1 The upper image shows the pre–coronary artery bypass graft (CABG) chest radiograph demonstrating the position of the subcutaneous implantable cardioverter-defibrillator sternal lead and generator. The upper red arrowhead points to the distal tip of the subcutaneously tunneled sensing electrode of the sternal lead, the middle red arrowhead points to the shock coil of the lead, and the lower red arrowhead points to the subxiphoid proximal sensing electrode and anchoring sleeve position of the lead. The long red arrow points to the transthoracic portion of the subcutaneously tunneled lead and the blue triangle points to the implanted position of the generator of the subcutaneous defibrillator. The lower pictured electrocardiogram shows a pre-CABG tracing from the lead II vector configuration of the subcutaneous recording from the distal electrodes to the can, demonstrating adequate QRS/T-wave ratio of 5:1, demonstrated by the superimposed orange discrimination template. HeartRhythm Case Reports 2017 3, 58-62DOI: (10.1016/j.hrcr.2016.09.002) Copyright © 2016 Heart Rhythm Society Terms and Conditions

Figure 2 The upper image shows the post–coronary artery bypass graft (CABG) chest radiograph demonstrating the position of the subcutaneous implantable cardioverter-defibrillator lead and generator. The upper red arrowhead points to the distal tip of the subcutaneously tunneled sensing electrode of the sternal lead carefully placed to avoid any possible contact with the sternal wires that could contribute to noise sensing, the middle red arrowhead points to the shock coil of the lead, and the lower red arrowhead points to the subxiphoid proximal sensing electrode and anchoring sleeve of the lead, which was exposed but not released during the surgery, therefore retaining the exact same position post-CABG. The transthoracic portion of the subcutaneously tunneled lead and implanted position of the generator of the subcutaneous defibrillator remain unaltered by the surgery. The lower pictured electrocardiogram shows a post-CABG tracing from the lead II vector configuration of the subcutaneous recording from the distal electrodes to the can, demonstrating a slightly diminished but still adequate QRS/T-wave ratio of 3:1, demonstrated by the superimposed orange discrimination template. At repeated outpatient testing post-discharge the QRS/T-wave ratio was back to the 5:1 baseline. HeartRhythm Case Reports 2017 3, 58-62DOI: (10.1016/j.hrcr.2016.09.002) Copyright © 2016 Heart Rhythm Society Terms and Conditions

Figure 3 Intraoperative photograph demonstrating the post–coronary artery bypass graft replacement of the sternal lead, after sternal wiring and thoracic cavity closure had been completed, but before subcutaneous and skin layers had been closed. HeartRhythm Case Reports 2017 3, 58-62DOI: (10.1016/j.hrcr.2016.09.002) Copyright © 2016 Heart Rhythm Society Terms and Conditions