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Trends Cardiovasc Med. 2001 Oct;11(7):295-301.

Arrhythmogenic ionic remodeling: adaptive responses with maladaptive consequences.

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  • 1Department of Medicine and Research Center, Montreal Heart Institute, University of Montreal, Montreal, Quebec, Canada. nattel@icm.umontreal.ca

Abstract

Compensatory changes in ion transport mechanisms occur in response to a variety of cardiac disease processes. Recent work has demonstrated that these adaptive responses can produce the arrhythmogenic substrate for a variety of important cardiac rhythm disorders. Two important paradigms are atrial tachycardia-induced remodeling and ionic remodeling caused by congestive heart failure. Atrial tachycardia promotes cellular Ca(2)+ loading and downregulates a variety of ion channels, particularly L-type Ca(2)+ channels, thereby promoting the occurrence and maintenance of atrial fibrillation. Congestive heart failure alters the expression and function of a variety of membrane transport processes, including several K(+)-channels and key Ca(2)+-transport systems, favoring the occurrence of arrhythmogenic afterdepolarizations. An improved understanding of the mechanisms and consequences of arrhythmogenic ionic remodeling promises to lead to novel and improved therapeutic approaches.

PMID:
11709284
[PubMed - indexed for MEDLINE]
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