Cardiac Implantable Electronic Devices (CIEDs) on Home Monitoring Download PDF, 686KB, PDF A cardiac implantable electronic device (CIED) is an electronic device implanted in the chest to monitor the heart rhythm and control heart rhythm abnormalities & symptoms.CIEDs include implantable loop recorders (ILR), permanent pacemakers (PPM) and implantable cardioverter defibrillators (ICD). [Please download the PDF file if you are unable to view the image below.]