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Figure 5 Two graphs demonstrating examples of patients with measurement of implantable cardioverter defibrillator (ICD) ring-to-coil impedance with translation software. (A) A drop in lead impedance (down arrow) precedes an inappropriate detection (up arrow) by a period of over 20 weeks. (B) A drop in lead impedance (down arrow) preceded ICD lead failure and need for lead extraction by almost one year. Lead extraction was performed in this patient before delivery of inappropriate shocks. Both of these patients underwent microscopic examination of the leads confirming the presence of metal ion oxidation breaching. VF = ventricular fibrillation.
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