Radiofrequency treatment of hepatic neoplasms in patients with permanent pacemakers

Clinicians who provide care for patients with implantable devices for rhyth m management, ie, pacemakers and internal cardioverter defibrillators, must be aware of sources of interference that could affect device function. Int racardiac radiofrequency is a recognized source of potential interference. However, radiofrequency to extracardiac sites that are relatively close to the implanted device has not been investigated thoroughly. We present 2 pat ients with permanent pacemakers undergoing intrahepatic radiofrequency for the treatment of metastatic disease. No interference was documented in eith er patient. Additional in vitro and in vivo studies are needed to determine definite clinical guidelines for such patients.