Implantable Cardioverter–Defibrillator Use in Older Adults

Since their initial clinical demonstration in 1980, implantable cardioverter–defibrillators (ICDs) have prolonged countless lives with successful treatment of sudden cardiac arrest.1 No other therapy has proved as effective in preventing death from ventricular arrhythmias, and important advances in ICD technology continue to improve outcomes for well-selected patients.2 Although indicated for a wide range of inherited and acquired conditions,3 ICDs are predominantly placed in older patients with left ventricular systolic dysfunction and either previous myocardial infarction or congestive heart failure.4 In the United States alone, >50 000 ICDs are placed annually in patients aged > 65 years, and nearly 500 000 more may meet current guidelines for device implantation.5 However, decision making for older patients considering ICD implantation is particularly challenging. Subjects in the landmark trials had average ages in the 60s, and thus the survival benefits of ICDs in older age groups is less well-established.6 In addition, compared with the younger participants in most clinical trials, older adults have a lower ratio of arrhythmic death to nonarrhythmic death because of competing risks for mortality, resulting in a potentially lower absolute risk reduction. At the same time, living and eventually dying with an ICD introduces potential risks, including a lower quality of life (QoL), hospitalizations, and potential suffering at the end of life.7 A rigorous consideration of the benefits, risks, and ongoing care surrounding ICD use in older patients is long overdue. On April 22, 2014, we convened a conference of multidisciplinary experts in cardiac electrophysiology, heart failure, geriatrics, ethics, and palliative care in Boston, supported by the Hartford Change AGEnts and Paul B. Beeson Career Development Award programs, and the Hebrew SeniorLife Institute for Aging Research. The objectives of the conference were (1) to review what is currently known about ICD use in …