Document Detail


Adjustable atrial and ventricular temporary electrode for low-energy termination of tachyarrhythmias early after cardiac surgery.
MedLine Citation:
PMID:  10642135     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Supraventricular and ventricular tachycardias are common and serious postoperative complications early after cardiac surgery. We introduce a completely removable temporary adjustable defibrillation electrode (TADE) for low energy cardioversion/defibrillation of postoperative atrial and ventricular tachyarrhythmias. The electrode consists of three loops of steel wires connected to one steel wire, which are movable within an isolation sheet for adjusting the active surface to the individual size of the heart chambers. Evaluation of the electrode was performed in 10 open-chest beagles with a mean weight of 25.5 kg. The electrodes were first positioned on the left and right atrium. Atrial fibrillation (AF) was induced via a bipolar temporary heart wire. Atrial defibrillation thresholds (DFTs) were measured according to a step-down shock protocol (5-0.4 J). Thereafter, the electrodes were adjusted and positioned on the right and left ventricle. Ventricular fibrillation (VF) was induced and DFTs were recorded the same way. Aortic flow and pressure and left ventricular pressure were continuously monitored throughout the experiment. For termination of AF, mean DFTs were 0.4 +/- 0 J (lowest possible shock level) with a mean shock impedance of 70 +/- 7.6 ohms. VF was terminated with a mean DFT of 3 +/- 1.1 J with a mean impedance 56.1 +/- 7.9 ohms. Complete transcutaneous removal of the electrodes was possible in all animals without any complications. In 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.
Authors:
H Mehmanesh; R Bauernschmitt; R Lange; S Hagl
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  22     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1999 Dec 
Date Detail:
Created Date:  2000-02-03     Completed Date:  2000-02-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1802-7     Citation Subset:  IM    
Affiliation:
Department of Cardiac Surgery, University of Heidelberg, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Aorta / physiology
Atrial Fibrillation / therapy
Blood Pressure / physiology
Cardiac Surgical Procedures* / adverse effects
Defibrillators, Implantable*
Dogs
Electric Impedance
Equipment Design
Heart Atria
Heart Ventricles
Polyurethanes
Regional Blood Flow / physiology
Stainless Steel
Tachycardia / etiology,  therapy*
Tachycardia, Supraventricular / etiology,  therapy
Tachycardia, Ventricular / etiology,  therapy
Ventricular Fibrillation / therapy
Ventricular Function, Left / physiology
Ventricular Pressure / physiology
Chemical
Reg. No./Substance:
0/Polyurethanes; 12597-68-1/Stainless Steel

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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