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Volume 303:1073-1077 November 6, 1980 Number 19 Next

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Abstract

We evaluated the prophylactic effect of antiarrhythmic agents against induction of ventricular tachycardia by extrastimulation in 51 patients with recurrent ventricular tachycardia. These patients subsequently underwent 58 long-term trials with tested agents. In 39 trials an agent predicted to be effective by electrophysiologic study was administered, and in 19 a drug predicted to be ineffective was used. There were no clinical differences between the two treatment groups. During a mean follow-up period of 8.2 months, arrhythmias recurred significantly less frequently in the group treated with drugs predicted to be effective than in the other group (P < 0.001); at six months 80 per cent of the patients in the former group were successfully treated, as compared with 33 per cent in the latter group. At 18 months the corresponding figures were 68 per cent and 11 per cent. We conclude that the arrhythmia-induction technique accurately predicts the clinical effectiveness of drugs used in the long-term treatment of recurrent ventricular tachycardia.

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