Flecainide acetate prevents recurrence of symptomatic paroxysmal supraventricular tachycardia. The Flecainide Supraventricular Tachycardia Study Group.

Abstract:

:Oral flecainide acetate was administered to 34 patients with documented symptomatic paroxysmal supraventricular tachycardia (PSVT) with a double-blind, placebo-controlled, 8-week crossover trial design. PSVT was defined as a regular tachycardia of at least 120 beats/min without evidence of atrioventricular dissociation. The study required considerable patient cooperation. Patients first entered a 4-week qualifying phase followed by a 3-week, open label, flecainide dose-ranging phase. They were then randomized in a blind fashion to receive either placebo or tolerated flecainide dose for an 8-week treatment period and then crossed over after four symptomatic documented episodes of PSVT or at the end of the treatment period. By all efficacy parameters analyzed, flecainide was superior to placebo. Flecainide was associated with an actuarial 79% freedom from symptomatic PSVT events compared with only 15% on placebo at 60 days (p less than 0.001). Of the 34 patients, 29 had recurrence of symptomatic PSVT at least once during the placebo phase; only eight patients had a recurrence during the flecainide phase (p less than 0.001). The median time to the first symptomatic PSVT event was 11 days in the placebo group and greater than 55 days in the flecainide group (p less than 0.001). Likewise, the interval between attacks was a median of 12 days on placebo compared with more than 55 days on flecainide (p less than 0.001). Finally, the flecainide slowed symptomatic PSVT heart rates to 143 +/- 12 beats/min from 178 +/- 12 on placebo (p less than 0.02) in the seven patients who had events in the placebo and flecainide treatment phases.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Circulation

journal_title

Circulation

authors

Henthorn RW,Waldo AL,Anderson JL,Gilbert EM,Alpert BL,Bhandari AK,Hawkinson RW,Pritchett EL

doi

10.1161/01.cir.83.1.119

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

119-25

issue

1

eissn

0009-7322

issn

1524-4539

journal_volume

83

pub_type

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