An alternative method for treatment of postoperative arrhythmia after heart surgery.

Introduction: Supraventricular and Ventricular tachycardias are common and serious postoperative complications early after cardiac surgery. We introduce a new temporary adjustable defibrillation electrode (TADE) for internal low-energy cardioversion/defibrillation of postoperative atrial and ventricular tachyarrhythmias. Methods: Evaluation of the new electrode was performed in ten open-chest beagles with a mean weight of 25,5 kg. The electrodes were first positioned on the left and right atrium. Atrial fibrillation (AU) was induced via a bipolar temporary heart wire. Atrial defibrillation thresholds (DFT's) were measured according to a step-down shock protocol (5]-0.4]). Thereafter, the electrodes were adjusted and positioned on the right and left ventricle. Ventricular fibrillation (VF) was induced and DFT's were recorded the same way. Results: For termination of AF, mean DFT's were 0.4 +/- 0] (lowest possible shock level) with a mean shock impedance of 70 +/- 7.6 Ohm. VF was terminated with a mean DFT of 3 +/- 1.1] with a mean impedance 56.1 +/- 7.9 Ohm. Complete transcutaneous removal of the electrodes was possible in all animals without any complications. Conclusion: Successful low-energy termination of AF and VF is possible with the tested temporary adjustable electrode. A clinical study is planned for further evaluation.