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  • Title: Treatment of paroxysmal reentrant supraventricular tachycardia with flecainide acetate.
    Author: Kim SS, Lal R, Ruffy R.
    Journal: Am J Cardiol; 1986 Jul 01; 58(1):80-5. PubMed ID: 3728336.
    Abstract:
    The electrophysiologic effects and therapeutic efficacy of intravenous and oral flecainide were studied in 15 patients with spontaneous and inducible sustained paroxysmal supraventricular tachycardia (SVT). Twelve patients had atrioventricular (AV) reentrance using an accessory pathway for retrograde conduction and 3 had AV nodal reentrance. Fourteen patients received intravenous flecainide (2 mg/kg body weight over 15 minutes) during an initial electrophysiologic study. Nine patients were restudied during oral flecainide administration (200 to 400 mg/day). After intravenous or oral flecainide therapy, reentrant SVT was noninducible in 6 patients with AV reentrance and in the 3 with AV nodal reentrance. In these 9 patients, intravenous flecainide prevented induction of reentrant SVT by depressing conduction over the retrograde limb of the reentry circuits. In the 6 patients with inducible sustained AV reentrant SVT before and after flecainide therapy, the cycle length of tachycardia increased significantly, mainly as the result of an increase in ventriculoatrial conduction time. There was concordance between the intravenous and the oral effects of flecainide on the mechanism of the SVT. Twelve patients continued oral flecainide treatment for a mean of 16 months (range 5 to 28). Tachycardia recurred in 3 of 4 patients whose arrhythmia remained inducible after flecainide therapy and in 1 of 8 patients whose SVT was suppressed. It is concluded that flecainide is an effective and convenient antiarrhythmic agent to treat patients who have AV nodal or AV reentrant SVT.
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