Cardiac memory: mechanisms and clinical implications.
Heart Rhythm
; 2(12): 1376-82, 2005 Dec.
Article
em En
| MEDLINE
| ID: mdl-16360096
ABSTRACT
Cardiac memory (CM) is identified as an altered T wave on electrocardiogram and vectorcardiogram that is seen when sinus rhythm resumes after a period of abnormal myocardial activation. Specifically, the sinus rhythm T wave tracks the QRS vector of the abnormal impulse. CM frequently is induced by ventricular pacing or arrhythmias and historically has been considered of minor relevance to medical practice. Although it has long been known that CM can mimic the T-wave inversions of myocardial ischemia, we learned more recently that CM can alter the actions of antiarrhythmic drugs. Furthermore, it provides a template for investigating the mechanisms whereby ventricular pacing affects myocardial physiology. In this article we review the mechanisms believed responsible for induction of CM and some of its more recently recognized clinical manifestations. We also discuss the controversies regarding atrial memory and its potential clinical implications.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Remodelação Ventricular
/
Eletrocardiografia
/
Sistema de Condução Cardíaco
/
Ventrículos do Coração
Tipo de estudo:
Prognostic_studies
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Heart Rhythm
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Estados Unidos