Control of Electrical Alternans in Canine Cardiac Purkinje Fibers

Overview

Journal Phys Rev Lett

Publisher American Physical Society

Specialty Biophysics

Date 2006 Apr 12

PMID 16605736

Citations 43

Authors

David J Christini

Mark L Riccio

Calin A Culianu

Jeffrey J Fox

Alain Karma

Robert F Gilmour Jr

Affiliations

Soon will be listed here.

Abstract

Alternation in the duration of consecutive cardiac action potentials (electrical alternans) may precipitate conduction block and the onset of arrhythmias. Consequently, suppression of alternans using properly timed premature stimuli may be antiarrhythmic. To determine the extent to which alternans control can be achieved in cardiac tissue, isolated canine Purkinje fibers were paced from one end using a feedback control method. Spatially uniform control of alternans was possible when alternans amplitude was small. However, control became attenuated spatially as alternans amplitude increased. The amplitude variation along the cable was well described by a theoretically expected standing wave profile that corresponds to the first quantized mode of the one-dimensional Helmholtz equation. These results confirm the wavelike nature of alternans and may have important implications for their control using electrical stimuli.

Citing Articles

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