Document Detail

Acute and chronic effects of epicardial radiofrequency applications delivered on epicardial coronary arteries.
MedLine Citation:
PMID:  21685298     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Epicardial coronary injury is by far the most feared complication of epicardial ablation. Little information is available regarding the chronic effects of delivering radiofrequency in the vicinity of large coronary vessels, and the long-term impact of this approach for mapping and ablation on epicardial vessel integrity is poorly understood. Therefore, the aim of this study was to characterize the acute and chronic histopathologic changes produced by in vivo epicardial pulses of radiofrequency ablation on coronary artery of porcine hearts.
METHODS AND RESULTS: Seven pigs underwent a left thoracotomy. The catheter was sutured adjacent to the left anterior descending artery and left circumflex artery, and 20 pulses of radiofrequency energy were applied. Radiofrequency lesions located no more than 1 mm of the vessel were used for this analysis. Three animals were euthanized 20 days (acute phase) after the procedure and 4 animals after 70 days (chronic phase). The following parameters were obtained in each vessel analyzed: (1) internal and external perimeter; (2) vessel wall thickness; (3) tunica media thickness, and (4) tunica intima thickness. The presence of adipose tissue around the coronary arteries, the distance between the artery and the epicardium, and the anatomic relationship of the artery with the coronary vein was also documented for each section. Sixteen of 20 (80%) sections analyzed, showed intimal thickening with a mean of 0.18 ± 0.14 mm compared with 0.13 ± 0.16 mm in the acute phase (P = 0.331). The mean tunica media thickness was 0.25 ± 0.10 mm in the chronic phase animals compared with 0.18 ± 0.03 mm in the acute phase animals (P = 0.021). A clear protective effect of pericardial fat and coronary veins was also present. A positive correlation between depth of radiofrequency lesion and the degree of vessel injury expressed as intimal and media thickening (P = 0.001) was present. A negative correlation was identified (r = -0.83; P = 0.002) between intimal thickening and distance between epicardium and coronary artery.
CONCLUSIONS: In this porcine model of in vivo epicardial radiofrequency ablation in proximity to coronary arteries leads to acute and chronic histopathologic changes characterized by tunica intima and media thickening, with replacement of smooth muscle cells with extracellular matrix, but no significant stenosis was observed up to 70 days after the ablation. The absence of acute coronary occlusion or injury does not preclude subsequent significant arterial damage, which frequently occurs when epicardial radiofrequency applications are delivered in close vicinity to the vessels.
Juan F Viles-Gonzalez; Reynaldo de Castro Miranda; Mauricio Scanavacca; Eduardo Sosa; Andre d'Avila
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Publication Detail:
Type:  Journal Article     Date:  2011-06-17
Journal Detail:
Title:  Circulation. Arrhythmia and electrophysiology     Volume:  4     ISSN:  1941-3084     ISO Abbreviation:  Circ Arrhythm Electrophysiol     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-08-17     Completed Date:  2011-10-13     Revised Date:  2012-02-03    
Medline Journal Info:
Nlm Unique ID:  101474365     Medline TA:  Circ Arrhythm Electrophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  526-31     Citation Subset:  IM    
Helsmely Cardiac Arrhythmia Service, Mount Sinai Medical Center, New York, NY, USA.
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MeSH Terms
Catheter Ablation / adverse effects*
Coronary Artery Disease / epidemiology,  pathology
Coronary Stenosis / epidemiology,  pathology
Coronary Thrombosis / epidemiology,  pathology
Coronary Vessels / injuries*,  pathology*
Models, Animal
Pericardium / surgery*
Tunica Intima / pathology
Tunica Media / pathology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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