Division of Cardiology, Department of I nternal Medicine, Yeungnam University Medical Center, Daegu, Republic of Korea (C-H.L.). Correspondence to: Melvin M. Scheinman, MD, Division of Cardiology, Section of Electrophysiology, University of California, 500 Parnassus Ave, MUE-434, Box 1354, San Francisco, CA 94117. Email Division of Cardiology, Section of Electrophysiology, University of California San Francisco (M.M.S.). An 81-year-old woman with hypertension and heart failure was referred to the emergency

Correspondence to: Parag R. Gajendragadkar, MPhil, DPhil, MRCP, Nuffield Department of Population Health, Old Road Campus, Oxford, OX3 7LF, United Kingdom. Email Division of Medicine, University of Cambridg e, United Kingdom (C.A.M.). Department of Cardiology, John Radcliffe Hospital, Oxford, United Kingdom (R.S.W.). An 84-year-old man with severe ischemic cardiomyopathy and a dual chamber implantable cardioverter defibrillator with previous treatment for sustained ventricular arrhythmi as presented

Correspondence to: Esteban González-Torrecilla, MD, PhD, Complutense University of Madrid; School of Medicine, Medicine Department, Cardiology Department, Hospital General Universitario “Gregorio Marañón.” Doctor Esquerdo 46, Madrid 28007 Spain. Email A 71-year-old woman was admitted due to intermittent palpitations and occasional episodes of mild dizziness, particularly noticeable on assuming a standing position during the past month. The ECG recorded in the emergency room is depicted in Figure 1. These