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- Title
Effects of High Energy Shocks on Pacing Impedance During Transvenous ICD Implantation.
- Authors
Hidden-Lucet, Francoise; Hartung, Wolfgang M.; McTeague, Kevin K.; Walter, Paul F.; Langberg, Jonathan J.
- Abstract
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 longlasting decrease in impedance after shocks. The magnitude of this change was similar for 0.6-J test shocks and shocks ≥ 5 J (28 ± 32 Ω vs 23 T 16 Ω; 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 Ω after four discharges. In conclusion, a progressive decline in pacing impedance is a characteristic response to transvenous ICD discharges.
- Subjects
MYOCARDIAL infarction; CORONARY disease; ELECTRIC stimulation; ELECTROPHYSIOLOGY; CARDIAC pacing; CARDIOLOGY
- Publication
Pacing & Clinical Electrophysiology, 1996, Vol 19, Issue 5, p752
- ISSN
0147-8389
- Publication type
Article
- DOI
10.1111/j.1540-8159.1996.tb03356.x