Document Detail

Effect of catheter position on the initiation of atrial echoes with atrial pacing and premature stimulation in patients with accessory pathways.
MedLine Citation:
PMID:  707286     Owner:  NLM     Status:  MEDLINE    
Eleven patients with an accessory pathway and reciprocating tachycardia were studied using both fixed rate atrial pacing and the atrial extrastimulus technique. Six of the patients had an accessory pathway that conducted in both the anterograde and retrograde direction; but the effective refractory period of their accessory pathway in the anterograde direction was relatively long and was greater than the longest coupling intervals that initiated atrial echoes. Five patients had an accessory pathway that conducted only in the retrograde direction. The extrastimulus technique could be used with stimulation sites near to and remote from the accessory pathway in 10 of the 11 patients. Atrial echoes were initiated by a single atrial extrastimulus at both sites in 7 of the 10 patients, and in each patient the upper limit of the echo zone was longer with stimulation at the site near the accessory pathway. In the other three patients atrial echoes were initiated only during stimulation at the site near the accessory pathway because either atrial refractoriness or atrioventricular nodal refractoriness was encountered before the echo zone was entered during stimulation at the site remote from the accessory pathway. Differences in the longest cycle length that initiated an atrial echo during fixed rate atrial pacing were similarly demonstrated in three patients. In these three patients, pacing at the site near the accessory pathway initiated echoes at a longer cycle length than pacing at the site remote from the accessory pathway. In three other patients the electrophysiologic characteristics of atrioventricular conduction prevented a demonstration of these differences. Catheter position is an important variable in the initiation of atrial echoes in patients with accessory pathways.
E L Pritchett; D G Benditt; W M Smith; J J Gallagher
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of cardiology     Volume:  42     ISSN:  0002-9149     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  1978 Nov 
Date Detail:
Created Date:  1978-12-27     Completed Date:  1978-12-27     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  738-45     Citation Subset:  AIM; IM    
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MeSH Terms
Arrhythmias, Cardiac / physiopathology*
Atrioventricular Node / physiopathology
Cardiac Pacing, Artificial*
Heart Catheterization
Heart Conduction System / physiopathology*
Tachycardia / physiopathology
Wolff-Parkinson-White Syndrome / physiopathology

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

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