Abstract
Of 54 patients with long-standing atrial fibrillation (mean duration 8.3 months), 27 patients were randomised to transvenous low-energy intracardiac biphasic direct-current (DC) cardioversion (ICV) using a single-lead balloon-tipped catheter, and 27 patents were randomised to conventional high-energy transthoracic monophasic DC cardioversion (TCV). ICV was performed with increasing energy levels (7.5–10–12.5–15 J) during mild sedation. TCV was performed with 200–360–360 J during general anaesthesia. Cardioversion to sinus rhythm occurred in 93% (25/27) following ICV and in 67% (18/27) following TCV (p = 0.04). Due to the higher cardioversion rate following ICV, more patients were in sinus rhythm during 180 days of follow-up (log rank test, p = 0.04). Low-energy intracardiac cardioversion represents a highly efficacious alternative to high-energy transthoracic cardioversion.
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