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      Does the Baseline Impedance Measurement during Radiof requency Catheter Ablation Influence the Likelihood of an Impedance Rise?

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          Abstract

          Most radiofrequency energy delivery systems provide a baseline (pre-ablation) impedance measurement; however, the application of this value, particularly in avoiding catheter overheating and coagulum formation, has not been described. We evaluated the ability of the product of the power output P and the baseline impedance Z (P × Z) to predict the likelihood of an impedance rise and coagulum formation during radiofrequency energy delivery in 62 consecutive patients undergoing successful catheter ablation of the slow atrioventricular (AV) nodal pathway or an accessory pathway. The mean P × Z during the 114 pulses resulting in an impedance rise was 3,770 ± 846 W Ω; only 42 impedance rises in 14 patients occurred at a P × Z < 3,500. For comparison, the P × Z during the single radiofrequency pulse that resulted in loss of pre-excitation or the slow AV nodal pathway in the entire patient group was 3,118 ± 590 (p = 0.001) and in only 9 patients was the P × Z > 3,500. This data suggest that adjusting the power during each radiofrequency pulse to maintain the P × Z < 3,500 should enable the operator to avoid most impedance rises.

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          Author and article information

          Journal
          CRD
          Cardiology
          10.1159/issn.0008-6312
          Cardiology
          S. Karger AG
          0008-6312
          1421-9751
          1996
          1996
          19 November 2008
          : 87
          : 1
          : 42-45
          Affiliations
          Section of Cardiac Electrophysiology and Pacing, Division of Cardiology, Department of Medicine, University of Massachusetts Medical Center, Worcester, Mass., USA
          Article
          177058 Cardiology 1996;87:42–45
          10.1159/000177058
          8631043
          © 1996 S. Karger AG, Basel

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          Page count
          Pages: 4
          Categories
          Arrhythmias, Electrophysiology and Electrocardiography

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