The electrical conversion of atrial flutter and fibrillation to normal sinus rhythm is effective and safe. However, follow-up study of 50 patients showed that sinus rhythm persisted in only 42% of those patients whose arrhythmias were initially converted. The mean follow-up time was ten months. The immediate and long-term results were much better in patients with atrial flutter and in those with atrial fibrillation of less than two years' duration.
Jensen JB, Humphries JO, Kouwenhoven WB, Jude JR. Electroshock for Atrial Flutter and Atrial Fibrillation: Follow-up Studies on 50 Patients. JAMA. 1965;194(11):1181–1184. doi:10.1001/jama.1965.03090240015003
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