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Pacing transmural scar tissue reduces left ventricle reverse remodeling after cardiac resynchronization therapy.
MedLine Citation:
PMID:  22225709     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: In patients with ischemic heart failure undergoing cardiac resynchronization therapy (CRT) the underlying myocardial substrate at the left ventricle (LV) pacing site may affect CRT response. However, the effect of delivering the pacing stimulus remote, adjacent to or over LV transmural scar tissue (TST) identified by echocardiography is still unknown. METHODS: First, 35 patients with healed myocardial infarction (57±11 years) were prospectically studied to demonstrate the capability of echocardiographic end-diastolic wall thickness (EDWT) to identify LV-TST as defined by delayed enhancement magnetic resonance imaging (DE-MRI). Subsequently, in 136 patients (65±10 years) who underwent CRT, EDWT was retrospectively evaluated at baseline. The LV catheter placement was defined over, adjacent to and remote from TST if pacing was delivered at a scarred segment, at a site 1 segment adjacent to or remote from scarred segments. CRT response was defined as LV end-systolic volume (ESV) decrease by at least 10% after 6months. RESULTS: A EDWT≤5mm identified TST at DE-MRI with 92% sensitivity and 96% specificity. In the 76 CRT responders, less overall and posterolateral TST segments and more segments paced remote from TST areas were found. At the multivariate regression analysis, the number of TST segments and scar/pacing relationship showed a significant association with CRT response. CONCLUSIONS: In addition to LV global scar burden, CRT response relates also to the myocardial substrate underlying pacing site as evaluated by standard echocardiography. This information may expand the role of echocardiography to guide pacing site avoiding pacing at TST areas.
Authors:
Donato Mele; Eustachio Agricola; Alessandro Dal Monte; Maurizio Galderisi; Antonello D'Andrea; Fausto Rigo; Rodolfo Citro; Elisabetta Chiodi; Giuseppe Marchese; Patrizia Della Valentina; Alice Calabrese; Roberto Ferrari
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-4
Journal Detail:
Title:  International journal of cardiology     Volume:  -     ISSN:  1874-1754     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8200291     Medline TA:  Int J Cardiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ireland Ltd. All rights reserved.
Affiliation:
Chair of Cardiology, Azienda Ospedaliera Universitaria, Ferrara and Fondazione Salvatore Maugeri, Brescia, Italy.
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