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We tested the effectiveness and safety of i.v. diltiazem in the management of paroxysmal supraventricular tachyarrhythmias in 39 patients, 21 with organic heart disease and seven in heart failure. Fifteen patients presented with supraventricular tachycardia, 12 with atrial fibrillation and 12 with atrial flutter. End points were conversion to sinus rhythm or slowing of the ventricular rate to 100 beats/min or less. Diltiazem was given as an i.v. bolus of either 150 or 300 micrograms/kg over 2 minutes. A second injection was administered to patients who received the lower dose and failed to reach either end point within 30 minutes. The overall success rate was 82% (32 of 39 patients). Time to end point was 5 minutes or less in 20 patients. Conversion to sinus rhythm occurred in 13 of 15 patients (87%) with supraventricular tachycardia and in two of 12 patients with atrial fibrillation. Treatment side effects included a slow ventricular rate in one patient who had a sick sinus syndrome and hypotension in two patients that rapidly responded to fluid administration. We conclude that i.v. diltiazem is effective and well tolerated and advocate its use in the management of paroxysmal supraventricular tachyarrhythmias.

Beneficial effect of intravenous diltiazem in the acute management of paroxysmal supraventricular tachyarrhythmias.