Document Detail

Myocardial injury and induction of arrhythmia by direct current shock delivered via endocardial catheters in dogs.
MedLine Citation:
PMID:  6705156     Owner:  NLM     Status:  MEDLINE    
Although electrical ablation of ventricular tachycardia via percutaneous catheters has been recently accomplished in human beings, little is known of its pathologic or arrhythmogenic effects. We studied 21 open-chest anesthetized dogs in which an endocardial electrode catheter was percutaneously introduced into the left ventricle. Direct current (DC) shock was delivered by a standard defibrillator through the distal electrode to a back paddle. Cross-sectional two-dimensional echocardiographic studies were performed in the plane of the catheter (confirmed by epicardial metal beads), and blood flow was determined by the microsphere technique before DC shock and when the animals were killed 2 to 8 days later. Of 11 dogs receiving a total of 100 to 400 J, only three survived 48 hr compared with nine of 10 receiving 50 J and all three control dogs. Holter monitoring demonstrated sustained ventricular tachycardia (VT) (greater than or equal to 30 sec) in all 11 dogs monitored (six received greater than or equal to 100 J), beginning within 5 hr of the DC shock; three control dogs had no VT. Two dogs that died suddenly while being monitored showed ventricular fibrillation. Histologic examination revealed hemorrhagic contraction band necrosis in the shock zone, a type of injury similar to that observed in reperfusion necrosis. Necrosis of the left ventricle was 0.5% to 5%. There was no significant difference in necrosis between dogs receiving 100 J or more and those receiving 50 J (2.5 vs 1.7 g; p greater than .10). Percent systolic thickening determined in eight equally divided regions around the left ventricle showed no difference between the shock zone, perishock zone, or remote normal zone in dogs receiving 50 J.(ABSTRACT TRUNCATED AT 250 WORDS)
B B Lerman; J L Weiss; B H Bulkley; L C Becker; M L Weisfeldt
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Circulation     Volume:  69     ISSN:  0009-7322     ISO Abbreviation:  Circulation     Publication Date:  1984 May 
Date Detail:
Created Date:  1984-05-16     Completed Date:  1984-05-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1006-12     Citation Subset:  AIM; IM    
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MeSH Terms
Arrhythmias, Cardiac / etiology*
Coronary Circulation
Echocardiography / methods
Electric Countershock / adverse effects*
Heart Injuries / etiology*
Myocardium / pathology*
Grant Support

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

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