Document Detail

Novel mechanism of postinfarction ventricular tachycardia originating in surviving left posterior Purkinje fibers.
MedLine Citation:
PMID:  16876739     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Other than bundle branch reentry and interfascicular reentry, monomorphic postmyocardial infarction (post-MI) reentrant ventricular tachycardia (VT) including the His-Purkinje system has not been reported. Verapamil-sensitive idiopathic left VT includes the left posterior Purkinje fibers but develops in patients without structural heart disease. OBJECTIVES: The purpose of this study was to describe a novel mechanism of reentrant VT arising from the left posterior Purkinje fibers in patients with a prior MI. METHODS: The study consisted of four patients with a prior MI and symptomatic heart failure who underwent electrophysiologic study and catheter ablation for VT showing right bundle branch block (n = 3) or atypical left bundle branch block (n = 1) morphology with superior axis. In two patients, the VT frequently emerged during the acute phase of MI and required emergency catheter ablation. RESULTS: Clinical VT was reproducibly induced by programmed stimulation. In three patients, both diastolic and presystolic Purkinje potentials were sequentially recorded along the left ventricular posterior septum during the VT, whereas in the fourth patient, only presystolic Purkinje potentials were observed. During entrainment pacing from the right atrium, diastolic Purkinje potentials were captured orthodromically and demonstrated decremental conduction properties, whereas presystolic Purkinje potentials were captured antidromically and appeared between the His and QRS complex. Radiofrequency energy delivered at the site exhibiting a Purkinje-QRS interval of 58 +/- 26 ms successfully eliminated the VTs without provoking any conduction disturbances. CONCLUSION: Reentrant monomorphic VT originating from the left posterior Purkinje fibers, which is analogous to idiopathic left VT, can develop in the acute or chronic phase of MI. Catheter ablation is highly effective in eliminating this VT without affecting left ventricular conduction.
Meiso Hayashi; Yoshinori Kobayashi; Yu-ki Iwasaki; Norishige Morita; Yasushi Miyauchi; Takao Kato; Teruo Takano
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Publication Detail:
Type:  Case Reports; Journal Article     Date:  2006-04-22
Journal Detail:
Title:  Heart rhythm : the official journal of the Heart Rhythm Society     Volume:  3     ISSN:  1547-5271     ISO Abbreviation:  Heart Rhythm     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-07-31     Completed Date:  2007-01-09     Revised Date:  2009-10-27    
Medline Journal Info:
Nlm Unique ID:  101200317     Medline TA:  Heart Rhythm     Country:  United States    
Other Details:
Languages:  eng     Pagination:  908-18     Citation Subset:  IM    
First Department of Internal Medicine, Nippon Medical School, Tokyo, Japan.
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MeSH Terms
Body Surface Potential Mapping
Bundle-Branch Block / etiology,  physiopathology
Cardiac Pacing, Artificial
Catheter Ablation
Confounding Factors (Epidemiology)
Diagnosis, Differential
Electrophysiologic Techniques, Cardiac
Follow-Up Studies
Heart Failure / etiology,  physiopathology
Heart Ventricles / physiopathology,  surgery
Middle Aged
Myocardial Infarction / complications,  epidemiology,  physiopathology*,  surgery
Purkinje Fibers / physiopathology*,  surgery
Tachycardia, Ventricular / diagnosis,  epidemiology,  etiology,  physiopathology*,  surgery

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