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Response of pulmonary vein potentials to premature stimulation.

Abstract：

INTRODUCTION:Pulmonary vein potentials reflect depolarization of muscle fascicles within the myocardial sleeves that surround the pulmonary veins. The response of pulmonary vein potentials to premature stimulation has not been described. METHODS AND RESULTS:In 31 patients with paroxysmal atrial fibrillation referred for segmental isolation of the pulmonary veins, programmed stimulation with a single atrial extrastimulus was performed from the coronary sinus. Bipolar and unipolar electrograms were recorded with a decapolar Lasso catheter positioned sequentially within the left superior, left inferior, and right superior pulmonary veins, near the ostium. Premature stimulation often resulted in greater separation of the atrial and pulmonary vein potentials recorded within the pulmonary veins, fractionation of the pulmonary vein potentials, a change in the circumferential activation sequence of the pulmonary vein potentials, and dropout of pulmonary vein potentials. CONCLUSION:In response to premature stimulation, the muscle fascicles within the myocardial sleeves that surround the pulmonary veins display a greater degree of decremental conduction than do the myocardial fibers in the adjacent left atrium, and they display heterogeneity in conduction properties and refractoriness. Discrimination of pulmonary vein potentials from atrial electrograms is facilitated by premature stimulation.

journal_name

J Cardiovasc Electrophysiol

journal_title

Journal of cardiovascular electrophysiology

authors

Tada H,Oral H,Ozaydin M,Greenstein R,Pelosi F Jr,Knight BP,Strickberger SA,Morady F

doi

10.1046/j.1540-8167.2002.00033.x

keywords:

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

33-7

issue

1

eissn

1045-3873

issn

1540-8167

journal_volume

13

pub_type

临床试验,杂志文章

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