Internal cardioversion is effective in restoring sinus rhythm. It might be indicated in patients in whom external cardioversion had failed or in whom external cardioversion is assumed to be difficult or even contraindicated.

Objective-To compare a new internal cardioversion system incorporated into a balloon guided catheter with a conventional two electrode system in patients with atrial fibrillation (AF). Conclusions-This new method of internal cardioversion has comparably high primary success rates and low sedation requirements with single and two lead systems. (Heart 1998;79:128-132)

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