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Electrical catheter ablation in the left and right ventricular wall in dogs: relation between delivered energy and histopathologic changes.

Abstract：

:Electrical catheter ablation of arrhythmogenic sites is now being used for the treatment of ventricular tachycardias. However, the extent and type of the ablation lesion in relation to energy level are controversial and not well known. In 10 beagles, single cathodal shocks of 30 (4 dogs), 80 (2 dogs) or 250 J (4 dogs) were delivered to the endocardial ventricular wall (5 dogs left ventricular, 5 dogs right ventricular). One week after ablation the dogs were killed for histopathologic examination. In the left ventricular wall, ablation lesion volumes calculated from measured extensions in three perpendicular directions were 0.4 and 0.9 cc at 30 J, 1.9 cc at 80 J and 2.8 and 3.4 cc at 250 J; in the right ventricular wall they were 0.4 and 0.5 cc at 30 J, 1.3 cc at 80 J and 2.5 and 4.2 cc at 250 J. In the right ventricular wall all 30 to 250 J lesions were transmural, whereas in the left ventricular wall only 250 J lesions were transmural. All lesions showed a necrotic area surrounded by granulation tissue with degenerated myofibrils. Thus, the size of the ablation lesion depends on delivered energy, whereas the pattern of histopathologic change is identical in the 30 to 250 J energy range. These results suggest that with accurate localization of the arrhythmogenic site one low energy shock may be successful with less myocardial damage.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Hauer RN,Straks W,Borst C,Robles de Medina EO

doi

10.1016/s0735-1097(86)80194-2

subject

Has Abstract

pub_date

1986-09-01 00:00:00

pages

637-43

issue

3

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(86)80194-2

journal_volume

8

pub_type

杂志文章

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