DAVID R. MAURITSON, M.D.; MICHAEL D. WINNIFORD, M.D.; W. SCOTT WALKER, B.S.; ROBERT E. RUDE, M.D.; JOAN R. CARY, R.N.; L DAVID HILLIS, M.D.
The effectiveness and safety of orally administered verapamil was tested in 11 patients with frequent paroxysmal supraventricular tachycardia. In a 4-month randomized, double-blind, placebo-controlled trial, the frequency of paroxysmal supraventricular tachycardia fell from 0.3 ± 0.3 (mean ± SD) to 0.1 ± 0.1 episodes per day by patient diary (p < 0.05) and from 0.7 ± 0.7 to 0.3 ± 0.5 episodes per day by Holter monitor (p < 0.05) for placebo and verapamil treatment periods, respectively. Verapamil caused a decrease in the duration of paroxysmal supraventricular tachycardia (in minutes per day): placebo 27 ± 51 by diary, 67 ± 111 by Holter; verapamil, 3 ± 3 by diary, 1 ± 2 by Holter (p < 0. 05). Five patients required a total of 35 pharmacologic cardioversions for sustained tachycardia: two during verapamil and 33 during placebo (p < 0.001). No verapamil treatment period was shortened due to unacceptable paroxysmal supraventricular tachycardia, but five of 22 placebo treatment periods were shortened (p = 0.02). Verapamil was well-tolerated, causing mild constipation in five patients and headache in one. Oral verapamil is both safe and effective in the long-term treatment of patients with paroxysmal supraventricular tachycardia.
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MAURITSON DR, WINNIFORD MD, WALKER WS, RUDE RE, CARY JR, HILLIS LD. Oral Verapamil for Paroxysmal Supraventricular Tachycardia: A Long-Term, Double-Blind Randomized Trial. Ann Intern Med. 1982;96:409–412. doi: 10.7326/0003-4819-96-4-409
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Published: Ann Intern Med. 1982;96(4):409-412.
Cardiology, Rhythm Disorders and Devices.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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