Ventricular arrhythmias in perspective: a current view.

While clinical management of patients with ventricular arrhythmias continues to evolve, some basic principles are generally accepted. First, patients with sustained ventricular tachyarrhythmias (ventricular tachycardia or ventricular fibrillation) require treatment. Second, patients with frequent ventricular ectopy or nonsustained ventricular tachycardia in the absence of underlying structural heart disease do not require treatment except when relief of symptoms is warranted. However, the indication for treatment of patients with frequent ventricular ectopy or nonsustained ventricular tachycardia in the presence of underlying structural heart disease remains uncertain. The concern is that these ventricular arrhythmias may be a precursor for sustained, potentially life-threatening ventricular tachyarrhythmias. Available data suggest that patients with underlying structural heart disease, particularly coronary artery disease and a previous myocardial infarction, who manifest frequent ventricular ectopy or more particularly nonsustained ventricular tachycardia, are at increased risk for sudden cardiac death. However, no studies have demonstrated to date that treatment of these arrhythmias will favorably affect outcome. Data are accumulating to suggest that use of the principles of risk stratification permits identification of patients at very high risk for developing sustained ventricular tachyarrhythmias. Carefully designed clinical trials are required before firm guidelines for the management of these patients can be defined.(ABSTRACT TRUNCATED AT 250 WORDS)