Abstract:
OBJECTIVES:We sought to evaluate the safety and efficacy of higher energy synchronized cardioversion in patients with atrial fibrillation refractory to standard energy direct current (DC) cardioversion. BACKGROUND:Standard external electrical cardioversion fails to restore sinus rhythm in 5% to 30% of patients with atrial fibrillation. METHODS:Patients with atrial fibrillation who failed to achieve sinus rhythm after at least two attempts at standard external cardioversion with 360 J were included in the study. Two external defibrillators, each connected to its own pair of R-2 patches in the anteroposterior position, were used to deliver a synchronized total of 720 J. RESULTS:Fifty-five patients underwent cardioversion with 720 J. Mean weight was 117 +/- 23 kg (body mass index 48.3 +/- 4.1 kg/m2). Structural heart disease was present in 76% of patients. Mean left ventricular ejection fraction was 45 +/- 12%. Atrial fibrillation was present for over three months in 55% of the patients. Sinus rhythm was achieved in 46 (84%) of the 55 patients. No major complications were observed. No patient developed hemodynamic compromise and no documented cerebrovascular accident occurred within one month after cardioversion. Of the 46 successful cardioversions, 18 patients (39%) remained in sinus rhythm over a mean follow-up of 2.1 months. CONCLUSIONS:External higher energy cardioversion is effective in restoring sinus rhythm in patients with atrial fibrillation refractory to standard energy DC cardioversion. This method is safe and does not result in clinical evidence of myocardial impairment. It may be a useful alternative to internal cardioversion because it could be done within the same setting of the failed standard cardioversion and obviates the need to withhold protective anticoagulation for internal cardioversion.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Saliba W,Juratli N,Chung MK,Niebauer MJ,Erdogan O,Trohman R,Wilkoff BL,Augostini R,Mowrey KA,Nadzam GR,Tchou PJdoi
10.1016/s0735-1097(99)00463-5subject
Has Abstractpub_date
1999-12-01 00:00:00pages
2031-4issue
7eissn
0735-1097issn
1558-3597pii
S0735-1097(99)00463-5journal_volume
34pub_type
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journal_title:Journal of the American College of Cardiology
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pub_type: 临床试验,杂志文章,随机对照试验
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