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Electrophysiologic and clinical effects of flecainide for recurrent paroxysmal supraventricular tachycardia

, : Electrophysiologic and clinical effects of flecainide for recurrent paroxysmal supraventricular tachycardia. American Journal of Cardiology 62(9): 585-589

The antiarrhythmic effects of flecaininde acetate were evaluated in 9 patients with paroxysmal atrioventricular(AV) nodal tachycardia and 17 patients with AV tachycardia. An electrophysiologic study was performed before and after intravenous flecainide acetate, 2 mg/kg body weight, was infused over 15 minutes and was followed by a maintenance infusion of 1.6 mg/kg given over 1 hour to 26 patients and during oral treatment to 15. Treatment with oral flecaininde acetate was continued for 14 .+-. 5 months. Intravenous flecainide acetate terminated AV nodal tachycardia by blocking the retrograde fast pathway conduction in 7 of 7 patients and AV tachycardia by blocking retrograde conduction in the extranodal pathway in 10 of 10 patients. AV nodal tachycardia and AV tachycardia were noninducible in 8 of 9 patients (90%, p < 0.001) and 11 of 17 patients (65%, p .+-. 0.001), respectively. Long-term treatment with oral flecaininde acetate suppressed AV nodal tachycardia and AV tachycardia in 8 of 9 patients (90%, p < 0.001) and 11 of 17 patients (65%, p < 0.001), respectively. A favorable outcome was associated with block in the accessory pathway after intravenous flecainide acetate and noninducibility during oral treatment. Recurrences preferentially occurred in the younger patients. Flecainide acetate is effective in the acute and long-term management of paroxysmal supraventricular reentry tachyacardia by suppressing conduction through the retrograde fast limb of the tachycardia circuit. The clinical effect can be predicted by electrophysiologic testing.

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Accession: 005349242

PMID: 3137798

DOI: 10.1016/0002-9149(88)90660-1

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