| Left ventricular epicardial outflow tract tachycardia: a new distinct subgroup of outflow tract tachycardia. | |
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MedLine Citation:
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PMID: 11502049 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The present study investigated the incidence and ECG characteristics of ventricular tachycardias (VTs) originating from the left ventricular (LV) epicardium. Thirty-one consecutive patients with VT or premature ventricular contraction originating from the outflow tract (OT-VT) underwent catheter ablation. Twenty-one OT-VTs were ablated from the endocardium in the right ventricular (RV) OT and 3 were ablated from the endocardium in the LVOT. In the remaining 7 patients, 4 (13%) OT-VTs were LV epicardial in origin, and 1 of these was ablated from the left sinus of Valsalva. The ECG characteristics of OT-VT of epicardial origin included prominent tall R-waves in the inferior leads, an R-wave in V1 and an S-wave in V2, precordial R-wave transition in V2-4, a deep QS-wave in aVL, and no S-wave in V6. In addition, there was an atypical left bundle branch block morphology with an inferior axis. These findings were observed during pacing from several sites in the LV epicardium. Furthermore, pacing from the left sinus of Valsalva caused a relatively tall R in V1, deep S-wave in V2 and a tall R-wave with a shallow S-wave in V3, as well as tall R-waves in the inferior leads, which represented intermediate characteristics between RV endocardial OT-VT and LV endocardial OT-VT. In conclusion, OT-VT originating from the LV epicardium is not uncommon and has characteristic ECG findings. Some of them can be ablated from the left sinus of Valsalva. |
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Authors:
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H Tada; A Nogami; S Naito; H Fukazawa; Y Horie; S Kubota; Y Okamoto; H Hoshizaki; S Oshima; K Taniguchi |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Japanese circulation journal Volume: 65 ISSN: 0047-1828 ISO Abbreviation: Jpn. Circ. J. Publication Date: 2001 Aug |
Date Detail:
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Created Date: 2001-08-14 Completed Date: 2002-01-17 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 7806868 Medline TA: Jpn Circ J Country: Australia |
Other Details:
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Languages: eng Pagination: 723-30 Citation Subset: IM |
Affiliation:
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Division of Cardiology, Gunma Prefectural Cardiovascular Center, Maebashi, Gunma, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Catheter Ablation Electrocardiography* Electrophysiologic Techniques, Cardiac Electrophysiology Female Humans Male Middle Aged Pericardium Tachycardia, Ventricular / physiopathology*, surgery Ventricular Function, Left |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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