High-risk patients with hypertrophic cardiomyopathy appear to have reduced risk of sudden cardiac death with an implantable cardioverter-defibrillator that terminates dangerous heart rhythm disorders, according to a study in the July 25 issue of JAMA. Hypertrophic cardiomyopathy (HCM) is the most common cause of sudden cardiac death in young people, including trained athletes. HCM is a genetic disease in which the heart muscle thickens abnormally, which can interfere with the heart’s electrical system, increasing the risk for life-threatening abnormal heartbeats (arrhythmias). Only in the last few years has the implantable cardioverter-defibrillator (ICD) been systematically used as a potentially life-saving treatment in high-risk patients with HCM, according to background information in the article. An ICD is a device designed to quickly detect a life-threatening, abnormal heart rhythm, and attempt to convert the rhythm back to normal by delivering an electrical shock to the heart. The effectiveness and appropriate selection of HCM patients for this therapy is not certain.
