José L. Morales et al. JACEP 2017;j.jacep.2017.02.015 Number and Type of ILM Events According to CIED and Leads Involved CIED = cardiac implanted electronic device; CRT-D = cardiac resynchronization therapy device; ICD = implantable cardioverter defibrillator; ILM-r = idiopathic lead migration (reel); ILM-t = idiopathic lead migration (twiddler); LV = left ventricle; PM = pacemaker; RA = right atrium; RV = right ventricle. José L. Morales et al. JACEP 2017;j.jacep.2017.02.015 2017 American College of Cardiology Foundation