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Cardiac dysfunction in rats prone to audiogenic epileptic seizures.
MedLine Citation:
PMID:  23340275     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: Cardiac dysfunction is one of the possible causes of sudden unexpected death in epilepsy (SUDEP). Therefore, the objective of this study was to evaluate cardiac and electrocardiographic parameters in rats with audiogenic epileptic seizures (WAR - Wistar audiogenic rats). METHODS: In vivo arterial pressure, heart rate (HR), autonomic tone and electrocardiography (ECG) were measured in awake animals in order to examine cardiac function and rhythm. Ex vivo, the Langendorff technique was used to analyze the cardiac function and the severity of reperfusion arrhythmias. In vitro, confocal microscopy was used to evaluate calcium transient parameters of isolated ventricular cardiomyocytes. RESULTS: In vivo autonomic tone evaluation revealed enhanced sympathetic activity, changes in cardiac function with increased systolic arterial pressure and higher basal HR in WAR. In addition, ECG analysis demonstrated electrical alterations with prolongation of the QT interval and QRS complex in these animals. Ex vivo, we observed a decrease in systolic tone and HR and an increase in the duration of ischemia/reperfusion arrhythmias in WAR. Moreover, intracellular Ca(2+) handling analysis revealed an increase in the peak of calcium and calcium transient decay in audiogenic rats. Treatment with atenolol (β1-adrenergic antagonist) normalized the systolic tone, reduced cardiac hypertrophy and the associated increase in the susceptibility to reperfusion arrhythmias observed in WAR. CONCLUSION: We present evidence that chronic disturbances in sympathetic tone in WAR cause increases the risk to life-threatening arrhythmias. Our results support a relationship between seizures, cardiac dysfunction and cardiac arrhythmias, which may contribute to the occurrence of SUDEP.
Authors:
Denis D Damasceno; Silvia Q Savergnini; Enéas R M Gomes; Silvia Guatimosim; Anderson J Ferreira; Maria C Doretto; Alvair P Almeida
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-19
Journal Detail:
Title:  Seizure : the journal of the British Epilepsy Association     Volume:  -     ISSN:  1532-2688     ISO Abbreviation:  Seizure     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306979     Medline TA:  Seizure     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013 British Epilepsy Association. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Department of Educational Development, Federal Institute of Education, Science and Technology of Southeast Minas Gerais - Campus, Barbacena, MG, Brazil; Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil. Electronic address: denis.damasceno@ifsudestemg.edu.br.
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