Heart failure has emerged as a major cardiovascular health problem. Over the past several decades, it has become apparent that one of the most important causes of morbidity and mortality in patients with congestive heart failure relates to cardiac arrhythmias. Over the past decade increasing data have accumulated defining the pathogenesis of these problems at cellular and molecular levels, in addition to the clinical setting. Clinical cardiology has become progressively subdivided into more highly specialized domains, yet the modern management of the heart failure patient crosses these boundaries. Given the cross-disciplinary nature of heart failure management, the Atlas of Electrophysiology in Heart Failure, which explores current concepts in the interface between heart failure and electrophysiology, comes at a timely juncture.