NDLI: Electrophysiologic depression in myocardium by defibrillation-level shocks

Content Provider	IEEE Xplore Digital Library
Author	Fogelson, L.J. Tung, L. Thakor, N.V.
Copyright Year	1992
Description	Author affiliation: Dept. of Biomed. Eng., Johns Hopkins Univ., Baltimore, MD, USA (Fogelson, L.J.; Tung, L.; Thakor, N.V.)
Abstract	The authors investigated the electrophysiological consequences of high currents on isolated strips of cardiac muscle. The objective was to measure the graded changes in intracellular action potentials-amplitude, duration, excitability, conduction velocity-resulting from the various levels of electrical shock typically used in defibrillation, cardioversion, and ablation. Following the shock, reversible injury is observed, whose severity is graded in proportion to shock strength. Smaller shocks (below 500 ma/cm/sup 2/, 10 ms) caused depression in action potential amplitude, duration, and propagation velocity. The degree of depression and the time course for complete recovery (0-50-s duration), followed by an action potential recovery phase similar to that observed for the smaller shocks. These graded effects can in conjunction with the whole heart description, of the current densities during defibrillation, permit an estimation of the total volume of tissue subject to inexcitability, reduced propagation velocity, shortened duration, and depressed action potentials.<>
Starting Page	963
Ending Page	964
File Size	159876
Page Count	2
File Format	PDF
ISBN	0780307852
DOI	10.1109/IEMBS.1988.95283
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-11-04
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Myocardium Electric shock Defibrillation Strips Muscles Electric variables measurement Velocity measurement Cardiology Injuries Heart
Content Type	Text
Resource Type	Article

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