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Clinical Trial
Comparative Study
Controlled Clinical Trial
Journal Article
Research Support, U.S. Gov't, P.H.S.
Effective termination of reentrant supraventricular tachycardia by single dose oral combination therapy with pindolol and verapamil.
American Heart Journal 1986 October
We evaluated the efficacy of single oral dose combining 20 mg pindolol and 120 mg verapamil in termination of paroxysmal supraventricular tachycardia (SVT) in 12 patients with recurrent symptomatic tachycardia. All had electrically inducible SVT lasting longer than 30 minutes. Patients were administered placebo or crushed pindolol and verapamil on 2 consecutive days after tachycardia was electrically induced and allowed to sustain for 30 minutes. With placebo, SVT lasted 186 +/- 18 minutes (mean +/- SEM); five patients converted spontaneously within 121 to 180 minutes. With pindolol and verapamil, 9 of 12 patients (responders) converted to sinus rhythm within 8 to 74 minutes. The mean duration of SVT in the nine responders was 28 +/- 8 minutes compared with 168 +/- 20 minutes on placebo (p less than 0.001). Before termination, tachycardia rate on pindolol and verapamil slowed significantly from 182 +/- 5 to 164 +/- 7/min (p less than 0.05) compared with no significant change in the rate of SVT on placebo. The mean systolic blood pressure during tachycardia was 97 +/- 5 mm Hg with placebo and 101 +/- 7 mm Hg with pindolol and verapamil. Serum levels of pindolol and verapamil obtained in seven patients at time of spontaneous termination of tachycardia were 66 +/- 13 and 56 +/- 14 ng/ml, respectively. The side effects with pindolol and verapamil included lightheadedness in one patient and symptoms of rapid palpitations in three. A single oral dose of pindolol and verapamil is safe and effective in termination of acute paroxysmal SVT and may be the initial therapy of choice in selected patients.
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