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Low energy intracardiac cardioversion after failed conventional external cardioversion of atrial fibrillation.

Abstract：

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 omega. 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.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Schmitt C,Alt E,Plewan A,Ammer R,Leibig M,Karch M,Schömig A

doi

10.1016/s0735-1097(96)00274-4

subject

Has Abstract

pub_date

1996-10-01 00:00:00

pages

994-9

issue

4

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(96)00274-4

journal_volume

28

pub_type

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