Clinical experience with sotalol in the treatment of cardiac arrhythmias.

The treatment of cardiac arrhythmias has changed over the past several years, as concerns have grown about proarrhythmias and increased mortality associated with certain antiarrhythmic agents. Sotalol, a unique racemic compound with both Class II (beta-blocking) and Class III (repolarization-prolonging) properties, effectively controls life-threatening arrhythmias and has a favorable safety profile, especially when compared with traditional antiarrhythmic drugs. A review of clinical trials demonstrates that sotalol is an effective treatment for premature ventricular complexes, ventricular tachycardia, and ventricular fibrillation. Moreover, it significantly reduces cardiac and all-cause mortality in these patient populations. Although sotalol currently is approved in the United States only for the treatment of life-threatening ventricular arrhythmias, it also is active against several supraventricular arrhythmias. Sotalol is safe and generally well tolerated; most of the adverse effects experienced with its use are related to its beta-blocking activity. However, sotalol has been associated with life-threatening proarrhythmias, including torsades de pointes, but the incidence of this adverse effect is low. Unlike pure Class II agents, sotalol usually is well tolerated in patients with mild-to-moderate left ventricular dysfunction and rarely causes new or worsening congestive heart failure. Sotalol represents an advance in the treatment and prevention of symptomatic ventricular arrhythmias and appears to be a reasonable first-line choice when the arrhythmia is life threatening.