PMID: 7025605Oct 1, 1981Paper

One to one atrioventricular conduction during atrial pacing at rates of 300/minute in absence of Wolff-Parkinson-White Syndrome

The American Journal of Cardiology
F MoleiroR J Myerburg

Abstract

One to one atrioventricular (A-V) or atrio-His bundle (A-H) conduction occurred during right atrial pacing at rates of 300/min in two patients with short P-R (and A-H) intervals, narrow QRS complexes and recurrent supraventricular tachyarrhythmias. Patient 1 had episodes of reciprocating A-V tachycardia and of atrial fibrillation with very fast rates (270 to 290/min) that were slowed to 100 to 135/min after administration of intravenous verapamil. Enhanced A-V (A-H) conduction was exposed only during stimulation from the high right atrium, but not from the low lateral right atrium or coronary sinus. Patient 2 had episodes of atrial flutter with 1:1 A-V conduction and rates of 290/min. The H-V interval was short (25 ms) during sinus rhythm and atrial pacing presumably because conduction occurred through an atrio-"distal" His bundle (atriofascicular) tract. In contrast, the H-V interval was normal (40 ms) in echo beats or when the "proximal" His bundle was stimulated. In these two patients, having as "common denominators" short P-R (and A-H) intervals, narrow QRS complexes and recurrent supraventricular tachyarrhythmias, enhanced A-V (A-H) conduction was (1) possible due to different electrogenetic mechanisms; (2) pacing-site dep...Continue Reading

References

Nov 1, 1979·Pacing and Clinical Electrophysiology : PACE·R J MyerburgA Castellanos
Oct 1, 1976·Circulation·J J GallagherA G Wallace
Apr 1, 1975·The American Journal of Cardiology·J K BissettM L Murphy
Aug 1, 1975·British Heart Journal·C Brechenmacher
Dec 11, 1975·The American Journal of Cardiology·M LevA Pick
Nov 1, 1970·Circulation Research·A L WitC Steiner
Nov 1, 1972·British Heart Journal·A CastellanosC A Castillo
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Oct 1, 1971·Circulation·W J MandelH Hayakawa
Jul 1, 1967·Diseases of the Chest·A CastellanosA Castellanos

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Citations

Mar 1, 1984·Journal of the American College of Cardiology·S K HuangP Denes
Sep 1, 1983·The American Journal of Cardiology·I Wiener
Sep 1, 1982·Pacing and Clinical Electrophysiology : PACE·A CastellanosR J Myerburg

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