Abstract
Multifocal atrial tachycardia (MAT) was observed in 9 patients aged 60-85 (mean 72.1 +/- 8.6) years during exacerbation of their chronic lung and/or cardiac disease. Four, in whom the rapid heart rate caused symptoms of pulmonary congestion, were treated with intravenous amiodarone (450-900 mg over 2 hours) with restoration of sinus rhythm soon after the termination of the drug infusion. In 1, with recurrence of MAT, the same intravenous dosage was repeated for 2 consecutive days, with final achievement of stable sinus rhythm. Five patients, apart from the conventional management of their underlying disease (digitalis, diuretics, aminophylline) were treated with oral amiodarone (600 mg/day). Sinus rhythm was restored in all and remained stable during their hospitalization, under alpha maintenance dosage of 200-400 mg daily. Amiodarone may be the drug of choice for the treatment of MAT, for which up to now no effective therapy has been established.
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