[Arrhythmias and cardiac electrophysiology].

In the past few months, numerous articles have been published on arrhythmias and cardiac electrophysiology. As in previous years, a substantial proportion of researchers have concentrated on atrial fibrillation, both on catheter ablation of chronic and paroxysmal atrial fibrillation and on the development of new approaches to thromboembolism prophylaxis. The feasibility of atrial fibrillation ablation by remote control has been demonstrated and a step-wise approach to ablation has been proposed, which appears to improve outcome and reduce lesion size. In addition, multicenter randomized trials have shown that the improvements in functional class and left ventricular ejection fraction achieved by ablation in patients with chronic atrial fibrillation are greater than those resulting from pharmacological treatment. New strategies are being developed to improve the selection of patients for defibrillator implantation and to decrease the number of high-energy discharges occurring during follow-up. Controlled trials continue to demonstrate that pharmacological therapy is of little value in preventing recurrence of vasovagal syncope compared with maneuvers involving isometric muscular contraction. Finally, one of the most significant events in the last year was the publication of new clinical practice guidelines by European and American societies of cardiology. These provide important recommendations on the treatment and prevention of ventricular arrhythmias and sudden death and on the management of and thromboembolic prophylaxis in atrial fibrillation.