Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNIFESP |
Texto Completo: | http://repositorio.unifesp.br/handle/11600/33189 http://dx.doi.org/10.1093/europace/euq391 |
Resumo: | Aims Corticosteroids attenuate late growth of radiofrequency (RF) lesions in the thigh muscle of infant rats. We sought to assess the impact of these drugs on the late growth of RF lesions in immature swine myocardium and to determine the electroanatomical mapping (EAM) characteristics of these lesions.Methods and results Radiofrequency (60 degrees C; 60 s) lesions were created in the right atrium (n = 2) and ventricle (n = 2) of 14 piglets (age 65 days; weight 5 kg) and 3 adults. Piglets were divided into: controls (n 7) and treated (n 7), receiving hydrocortisone (10 mg/kg iv after RF) and prednisone (1 mg/kg/day) for 29 days. After 8 months, animals were sacrificed for histological analysis. in four piglets, endocardial and epicardial voltage EAM were performed.In infant groups, the dimensions of atrial (11 +/- 5 vs. 13 +/- 7 mm) and ventricular (12 +/- 3 vs. 11 +/- 3 mm) lesions were similar. in adults, atrial (6 +/- 1 mm) and ventricular (6 +/- 1 mm) lesions were smaller. in controls, ventricular lesions depicted dense fibrosis and multiple strands of fibrous tissue extending from the lesion into normal muscle. Treated piglets revealed scars exhibiting less dense fibrosis with predominance of fibroadipose tissue and less collagen proliferation. Large atrial and ventricular low-voltage areas corresponding to the macroscopic lesions were identified in all animals.Conclusion Radiofrequency lesions in infant pigs reveal late growth and invasion of normal muscle by intense collagen proliferation. Corticosteroids do not prevent late enlargement of the lesions but modulate the fibrotic proliferation. the expressive growth of the lesion may generate low-voltage areas detectable by EAM. |
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Arfelli, Elerson [UNIFESP]Araujo, Sergio de [UNIFESP]Okada, Mieko [UNIFESP]Nascimento, Thais [UNIFESP]Santos, Luis Felipe N. dos [UNIFESP]Franco, Marcello [UNIFESP]Paola, Angelo A. V. de [UNIFESP]Fenelon, Guilherme [UNIFESP]Universidade Federal de São Paulo (UNIFESP)2016-01-24T14:05:51Z2016-01-24T14:05:51Z2011-01-01Europace. Oxford: Oxford Univ Press, v. 13, n. 1, p. 121-128, 2011.1099-5129http://repositorio.unifesp.br/handle/11600/33189http://dx.doi.org/10.1093/europace/euq39110.1093/europace/euq391WOS:000285417000024Aims Corticosteroids attenuate late growth of radiofrequency (RF) lesions in the thigh muscle of infant rats. We sought to assess the impact of these drugs on the late growth of RF lesions in immature swine myocardium and to determine the electroanatomical mapping (EAM) characteristics of these lesions.Methods and results Radiofrequency (60 degrees C; 60 s) lesions were created in the right atrium (n = 2) and ventricle (n = 2) of 14 piglets (age 65 days; weight 5 kg) and 3 adults. Piglets were divided into: controls (n 7) and treated (n 7), receiving hydrocortisone (10 mg/kg iv after RF) and prednisone (1 mg/kg/day) for 29 days. After 8 months, animals were sacrificed for histological analysis. in four piglets, endocardial and epicardial voltage EAM were performed.In infant groups, the dimensions of atrial (11 +/- 5 vs. 13 +/- 7 mm) and ventricular (12 +/- 3 vs. 11 +/- 3 mm) lesions were similar. in adults, atrial (6 +/- 1 mm) and ventricular (6 +/- 1 mm) lesions were smaller. in controls, ventricular lesions depicted dense fibrosis and multiple strands of fibrous tissue extending from the lesion into normal muscle. Treated piglets revealed scars exhibiting less dense fibrosis with predominance of fibroadipose tissue and less collagen proliferation. Large atrial and ventricular low-voltage areas corresponding to the macroscopic lesions were identified in all animals.Conclusion Radiofrequency lesions in infant pigs reveal late growth and invasion of normal muscle by intense collagen proliferation. Corticosteroids do not prevent late enlargement of the lesions but modulate the fibrotic proliferation. the expressive growth of the lesion may generate low-voltage areas detectable by EAM.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Universidade Federal de São Paulo, Discipline Cardiol, Paulista Sch Med, BR-04039030 São Paulo, BrazilUniversidade Federal de São Paulo, Dept Pathol, Paulista Sch Med, BR-04039030 São Paulo, BrazilUniversidade Federal de São Paulo, Discipline Cardiol, Paulista Sch Med, BR-04039030 São Paulo, BrazilUniversidade Federal de São Paulo, Dept Pathol, Paulista Sch Med, BR-04039030 São Paulo, BrazilWeb of Science121-128engOxford Univ PressEuropacehttp://www.oxfordjournals.org/access_purchase/self-archiving_policyb.htmlinfo:eu-repo/semantics/openAccessArrhythmiasRadiofrequency ablationElectroanatomical mappingCorticosteroidsImpact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findingsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlereponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESP11600/331892022-09-27 14:45:04.135metadata only accessoai:repositorio.unifesp.br:11600/33189Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestopendoar:34652023-05-25T12:27:29.114078Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false |
dc.title.en.fl_str_mv |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
title |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
spellingShingle |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings Arfelli, Elerson [UNIFESP] Arrhythmias Radiofrequency ablation Electroanatomical mapping Corticosteroids |
title_short |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
title_full |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
title_fullStr |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
title_full_unstemmed |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
title_sort |
Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings |
author |
Arfelli, Elerson [UNIFESP] |
author_facet |
Arfelli, Elerson [UNIFESP] Araujo, Sergio de [UNIFESP] Okada, Mieko [UNIFESP] Nascimento, Thais [UNIFESP] Santos, Luis Felipe N. dos [UNIFESP] Franco, Marcello [UNIFESP] Paola, Angelo A. V. de [UNIFESP] Fenelon, Guilherme [UNIFESP] |
author_role |
author |
author2 |
Araujo, Sergio de [UNIFESP] Okada, Mieko [UNIFESP] Nascimento, Thais [UNIFESP] Santos, Luis Felipe N. dos [UNIFESP] Franco, Marcello [UNIFESP] Paola, Angelo A. V. de [UNIFESP] Fenelon, Guilherme [UNIFESP] |
author2_role |
author author author author author author author |
dc.contributor.institution.none.fl_str_mv |
Universidade Federal de São Paulo (UNIFESP) |
dc.contributor.author.fl_str_mv |
Arfelli, Elerson [UNIFESP] Araujo, Sergio de [UNIFESP] Okada, Mieko [UNIFESP] Nascimento, Thais [UNIFESP] Santos, Luis Felipe N. dos [UNIFESP] Franco, Marcello [UNIFESP] Paola, Angelo A. V. de [UNIFESP] Fenelon, Guilherme [UNIFESP] |
dc.subject.eng.fl_str_mv |
Arrhythmias Radiofrequency ablation Electroanatomical mapping Corticosteroids |
topic |
Arrhythmias Radiofrequency ablation Electroanatomical mapping Corticosteroids |
description |
Aims Corticosteroids attenuate late growth of radiofrequency (RF) lesions in the thigh muscle of infant rats. We sought to assess the impact of these drugs on the late growth of RF lesions in immature swine myocardium and to determine the electroanatomical mapping (EAM) characteristics of these lesions.Methods and results Radiofrequency (60 degrees C; 60 s) lesions were created in the right atrium (n = 2) and ventricle (n = 2) of 14 piglets (age 65 days; weight 5 kg) and 3 adults. Piglets were divided into: controls (n 7) and treated (n 7), receiving hydrocortisone (10 mg/kg iv after RF) and prednisone (1 mg/kg/day) for 29 days. After 8 months, animals were sacrificed for histological analysis. in four piglets, endocardial and epicardial voltage EAM were performed.In infant groups, the dimensions of atrial (11 +/- 5 vs. 13 +/- 7 mm) and ventricular (12 +/- 3 vs. 11 +/- 3 mm) lesions were similar. in adults, atrial (6 +/- 1 mm) and ventricular (6 +/- 1 mm) lesions were smaller. in controls, ventricular lesions depicted dense fibrosis and multiple strands of fibrous tissue extending from the lesion into normal muscle. Treated piglets revealed scars exhibiting less dense fibrosis with predominance of fibroadipose tissue and less collagen proliferation. Large atrial and ventricular low-voltage areas corresponding to the macroscopic lesions were identified in all animals.Conclusion Radiofrequency lesions in infant pigs reveal late growth and invasion of normal muscle by intense collagen proliferation. Corticosteroids do not prevent late enlargement of the lesions but modulate the fibrotic proliferation. the expressive growth of the lesion may generate low-voltage areas detectable by EAM. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011-01-01 |
dc.date.accessioned.fl_str_mv |
2016-01-24T14:05:51Z |
dc.date.available.fl_str_mv |
2016-01-24T14:05:51Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
Europace. Oxford: Oxford Univ Press, v. 13, n. 1, p. 121-128, 2011. |
dc.identifier.uri.fl_str_mv |
http://repositorio.unifesp.br/handle/11600/33189 http://dx.doi.org/10.1093/europace/euq391 |
dc.identifier.issn.none.fl_str_mv |
1099-5129 |
dc.identifier.doi.none.fl_str_mv |
10.1093/europace/euq391 |
dc.identifier.wos.none.fl_str_mv |
WOS:000285417000024 |
identifier_str_mv |
Europace. Oxford: Oxford Univ Press, v. 13, n. 1, p. 121-128, 2011. 1099-5129 10.1093/europace/euq391 WOS:000285417000024 |
url |
http://repositorio.unifesp.br/handle/11600/33189 http://dx.doi.org/10.1093/europace/euq391 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.none.fl_str_mv |
Europace |
dc.rights.driver.fl_str_mv |
http://www.oxfordjournals.org/access_purchase/self-archiving_policyb.html info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://www.oxfordjournals.org/access_purchase/self-archiving_policyb.html |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
121-128 |
dc.publisher.none.fl_str_mv |
Oxford Univ Press |
publisher.none.fl_str_mv |
Oxford Univ Press |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UNIFESP instname:Universidade Federal de São Paulo (UNIFESP) instacron:UNIFESP |
instname_str |
Universidade Federal de São Paulo (UNIFESP) |
instacron_str |
UNIFESP |
institution |
UNIFESP |
reponame_str |
Repositório Institucional da UNIFESP |
collection |
Repositório Institucional da UNIFESP |
repository.name.fl_str_mv |
Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP) |
repository.mail.fl_str_mv |
|
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1783460293130584064 |