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  • Title: Electrophysiologic assessment of antiarrhythmic drug efficacy for ventricular tachyarrhythmias associated with dilated cardiomyopathy.
    Author: Rae AP, Spielman SR, Kutalek SP, Kay HR, Horowitz LN.
    Journal: Am J Cardiol; 1987 Feb 01; 59(4):291-5. PubMed ID: 3544793.
    Abstract:
    To determine the benefit of serial electrophysiologic drug testing in patients with ventricular tachyarrhythmias related to dilated cardiomyopathy, programmed ventricular stimulation was performed in 38 patients. In the baseline study, sustained ventricular tachycardia (VT) was induced in 18 patients, ventricular fibrillation in 7 and nonsustained VT in 13. The patients underwent a total of 84 trials of drug therapy (mean 2.3 +/- 1.4 trials/patient). Complete success (induction of fewer than 6 repetitive responses) was recorded in 19 trials and partial success (induction of at least 6 but no more than 15 repetitive responses) in 7. Potential proarrhythmic effects were observed in 9 trials. Overall, at least 1 successful regimen was identified for 20 patients (53%). During a mean follow-up of 21 +/- 13 months, there were no arrhythmia recurrences or episodes of sudden death among patients discharged with a drug regimen determined to be effective by serial drug testing. In comparison, among patients taking regimens that failed to prevent arrhythmia induction, there were 3 arrhythmia recurrences and 2 sudden deaths (p less than 0.05). Serial electrophysiologic drug testing provides an effective method of identifying successful medical therapy for patients with ventricular arrhythmia related to dilated cardiomyopathy.
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