Key result
Temporary epicardial wire electrodes achieve 100% conversion of induced AF using low-energy shocks.
Why the study?
Atrial fibrillation is the most common arrhythmia following open heart surgery, and the performance of temporary epicardial stainless steel wire electrodes for atrial defibrillation needed evaluation.
Observational (n=100)
Answers are grounded in this paper and cite their sources.
Prospective study demonstrates safe, low-energy cardioversion using temporary epicardial electrodes in open heart surgery patients, indicating electrical treatment without anesthesia is feasible.
AF is the most common arrhythmia following open heart surgery. Transthoracic cardioversion is used when pharmacological treatment fails to restore SR, or is ineffective in controlling ventricular response rate. We report on the performance of temporary atrial defibrillation wire electrodes implanted on the epicardium of patients undergoing open heart surgery. Epicardial stainless steel wire electrodes for both pacing/sensing and atrial defibrillation were placed at the left and right atrium during open heart surgery in 100 consecutive patients (age 65 +/- 9 years; male/female 77/23). Electrophysiological studies performed postoperatively revealed a test shock (0.3 J) impedance of 96 +/- 12 omega (monophasic) and 97 +/- 13 omega (biphasic). AF was induced by burst stimulation in 84 patients. All patients were successfully converted to SR. The mean energy of successful shocks was 3.1 +/- 1.9 J. Atrial pacing and sensing were accomplished in all patients. Pacing threshold was 1.9 +/- 1.7 V (0.5 ms) in the left atrium and 2.1 +/- 2 V in the right atrium. P wave sensing was 2.5 +/- 1.6 mV in the left atrium and 2.3 +/- 1.4 mV in the right atrium. No complications were observed with shock application, nor with lead extraction. Atrial defibrillation using temporary epicardial wire electrodes can be performed successfully and safely in patients following cardiac operations. The shock energy required to restore SR is low. Electrical cardioversion in the absence of anesthesia should be feasible.
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Liebold et al. (1999) conducted an observational in Atrial fibrillation following open heart surgery (n=100). Temporary epicardial stainless steel wire electrodes was evaluated on Successful conversion to sinus rhythm after induced atrial fibrillation. Temporary epicardial wire electrodes successfully converted 100% of patients (84/84) with induced atrial fibrillation to sinus rhythm using a low mean shock energy of 3.1 J.
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