Document Detail

Effects of high energy shocks on pacing impedance during transvenous ICD implantation.
MedLine Citation:
PMID:  8734741     Owner:  NLM     Status:  MEDLINE    
The purpose of the current study was to characterize the effects of transvenous ICD shocks on myocardial impedance. Rather than recording impedance during shocks, it was measured during continuous pacing in order to minimize confounding effects such as electrode polarization. Pacing impedance (reflecting the combined impedances of the electrode-tissue interface, myocardium, and blood pool) was measured every 5 seconds before and after 58 single shocks in 22 patients undergoing ICD implantation with a Transvene (n = 14) or Endotak (n = 8) lead. There was a progressive and long-lasting decrease in impedance after shocks. The magnitude of this change was similar for 0.6-J test shocks and shocks > or = 5 J (28 +/- 32 omega vs 23 +/- 16 omega; P = 0.8). However, the drop in impedance was more abrupt after high energy shocks. Because impedance continued to decline throughout the 5-minute interval between shocks, successive shocks had a cumulative effect, with a decrease of 46 +/- 42 omega after four discharges. In conclusion, a progressive decline in pacing impedance is a characteristic response to transvenous ICD discharges.
F Hidden-Lucet; W M Hartung; K K McTeague; P F Walter; J J Langberg
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Pacing and clinical electrophysiology : PACE     Volume:  19     ISSN:  0147-8389     ISO Abbreviation:  Pacing Clin Electrophysiol     Publication Date:  1996 May 
Date Detail:
Created Date:  1996-10-21     Completed Date:  1996-10-21     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7803944     Medline TA:  Pacing Clin Electrophysiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  752-7     Citation Subset:  IM    
Cardiology Division, Emory University Hospital, Atlanta, Georgia 30322, USA.
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MeSH Terms
Anti-Arrhythmia Agents / therapeutic use
Cardiac Pacing, Artificial*
Confounding Factors (Epidemiology)
Defibrillators, Implantable*
Electric Conductivity
Electric Impedance
Electrodes, Implanted
Equipment Design
Heart / physiology*
Middle Aged
Time Factors
Reg. No./Substance:
0/Anti-Arrhythmia Agents

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

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