Background The relative efficacies of various antiarrhythmicdrugs in the treatment of ventricular tachyarrhythmias are notwell known. This study examined the effectiveness of imipramine,mexiletine, pirmenol, procainamide, propafenone, quinidine,and sotalol in patients with ventricular tachyarrhythmias whowere enrolled in the Electrophysiologic Study versus ElectrocardiographicMonitoring trial.
Methods Patients were randomly assigned to undergo serial testingof the efficacy of the seven antiarrhythmic drugs by one oftwo strategies: electrophysiologic study or Holter monitoringtogether with exercise testing. The seven drugs were then testedfor efficacy in random order in patients who were eligible toreceive them. The frequencies of predictions of drug efficacyand of adverse drug effects during the initial drug titrationwere tabulated for all 486 randomized subjects. Patients receivedlong-term treatment with the first antiarrhythmic drug thatwas predicted to be effective on the basis of drug testing.Recurrences of arrhythmia, deaths, and adverse drug effectsduring long-term follow-up were recorded for the 296 patientsin whom an antiarrhythmic drug was predicted to be effective.
Results In the electrophysiologic-study group, the percentageof patients who had predictions of drug efficacy was higherwith sotalol (35 percent) than with the other drugs (16 percent,P<0.001). There was no significant difference among the drugsin the Holter-monitoring group. The percentage of patients withadverse drug effects was lowest among those receiving sotalol.The actuarial probability of a recurrence of arrhythmia aftera prediction of drug efficacy by either strategy was significantlylower for patients treated with sotalol than for patients treatedwith the other drugs (risk ratio, 0.43; 95 percent confidenceinterval, 0.29 to 0.62; P<0.001). With sotalol, as comparedwith the other drugs combined, there were lower risks of deathfrom any cause (risk ratio, 0.50; 95 percent confidence interval,0.30 to 0.80; P = 0.004), death from cardiac causes (0.50; P= 0.02), and death from arrhythmia (0.50; P = 0.04). The cumulativepercentage of patients in whom a drug was predicted to be effectiveand in whom it remained effective and tolerated was higher forsotalol than for the other drugs (P<0.001).
Conclusions Sotalol was more effective than the other six antiarrhythmicdrugs in preventing death and recurrences of arrhythmia. Inpatients similar to those in this study, if antiarrhythmic-drugtherapy is to be used to prevent recurrences of ventriculartachyarrhythmias, treatment with sotalol and assessment of itspotential efficacy by Holter monitoring are a reasonable initialstrategy.
Source Information
The study investigators are listed in the Appendix of the preceding article.
From the Cardiology Division, University of Utah Medical Center, 50 N. Medical Dr., Salt Lake City, UT 84132, where reprint requests should be addressed to Dr. Mason.
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