Author + information
- Received December 15, 1995
- Revision received March 20, 1996
- Accepted May 24, 1996
- Published online October 1, 1996.
- CLAUS SCHMITT*,
- ECKHARD ALT,
- ANDREAS PLEWAN,
- RICHARD AMMER,
- MARCUS LEIBIG,
- MARTIN KARCH and
- ALBERT SCHÖMIG
- ↵*Address for correspondence: Dr. Claus Schmitt, 1. Medizinische Klinik, Klinikum rechts der Isar, Ismaninger Strasse 22, 81675 Munich, Germany.
Objectives. This study was designed to evaluate the efficacy of intracardiac cardioversion in patients with chronic atrial fibrillation after unsuccessful external cardioversion.
Background. Previous studies in patients with atrial fibrillation undergoing intracardiac cardioversion have suggested that intracardiac cardioversion is highly effective and safe. However, the characteristics of patients who benefit most from this invasive technique are unknown.
Methods. We prospectively studied 25 consecutive patients with chronic atrial fibrillation (11 ± 9 months). All patients had undergone at least three attempts at conventional external transthoracic cardioversion by means of paddles in an anteroposterolateral position applying energies up to 360 J without success. Intracardiac shocks were delivered by an external defibrillator through defibrillation electrodes placed in the right atrium and coronary sinus or in the right atrium and left pulmonary artery. After conversion, all patients were treated orally with sotalol (mean 194 ± 63 mg/day).
Results. Internal cardioversion was successful in 22 of 25 patients at a mean defibrillation threshold of 6.5 ± 3.0 J. Mean lead impedance was 56.4 ± 7.4 Ω. No severe complications were observed. At a mean follow-up of 15 ± 12 months, 12 (55%) of the patients treated successfully remained in sinus rhythm.
Conclusions. In patients with failed external cardioversion, internal cardioversion offers a new option for restoring sinus rhythm. Intracardiac cardioversion is an effective and safe method and can be easily performed in patients with minimal sedation.
- Received December 15, 1995.
- Revision received March 20, 1996.
- Accepted May 24, 1996.
- THE AMERICAN COLLEGE OF CARDIOLOGY