PMID: 9170126May 1, 1997Paper

Modification of atrioventricular nodal electrophysiology by selective radiofrequency delivery on the anterior or posterior approaches

Pacing and Clinical Electrophysiology : PACE
F J ChorroV López-Merino

Abstract

An analysis was made in 14 isolated and perfused rabbit hearts of the electrophysiological effects of selective radiofrequency (RF) delivery in the anterior (group I, n = 7) or posterior zone (group II, n = 7) of the Koch triangle, with the aim of modifying atrioventricular nodal (AVN) conduction without suppressing 1:1 transmission. After opening the right atrium, RF was delivered (0.5 W) with a 1-mm diameter unipolar electrode positioned in the selected zone until a prolongation of no less than 15% was obtained in the Wenckebach cycle length (WCL). Before and after (30 min) RF, anterograde and retrograde AVN refractoriness and conduction were evaluated, stimulating from the crista terminalis (CT), the interatrial septum (IAS), and from the RV epicardium. After RF, the following percentage increments were observed in group I: AH(CT) = 36% +/- 9%, AH(IAS) = 38% +/- 11%, WCL(CT) = 28% +/- 8%, WCL(IAS) = 22% +/- 6%, functional refractory period (FRP) of the AVN(CT) = 13% +/- 11%, FRP-AVN(IAS) = 13% +/- 8%, retrograde WCL = 20% +/- 19%, and retrograde FRPVA = 13% +/- 16%. The increments observed in group II and the significances of the differences with respect to group I were: AH(CT) = 11% +/- 14% (P < 0.01), AH(IAS) = 19% +/- 32%...Continue Reading

References

Jun 1, 1975·British Heart Journal·Y Leon FAK M Rosen
Aug 1, 1990·Journal of the American College of Cardiology·J J GoyL Kappenberger
Oct 1, 1989·Pacing and Clinical Electrophysiology : PACE·R SanjuanV Lopez-Merino
Mar 1, 1988·The American Journal of Cardiology·K P KunzeK H Kuck
Oct 1, 1993·Pacing and Clinical Electrophysiology : PACE·F SuzukiM H Lehmann
Jul 1, 1956·Circulation Research·G K MOEH BURLINGTON

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