Ventriculoatrial conduction in patients without high-grade AV block: when is it present?

This study sought to characterize retrograde conduction during EPS and to utilize it as a diagnostic tool in patients without AV block.Methods and resultsPatients with intact AV conduction undergoing EPS were included in this study to systematically evaluate baseline VA conduction. If absent, parahisian pacing was used to determine the level of block (nodal or infranodal). Recovery of VA conduction with increased sympathetic activity was assessed with isoproterenol infusion. Baseline characteristics and electrophysiological data were collected and analyzed. Among the 801 patients studied, VA conduction was present in 98% (81% at baseline and 17% after isoproterenol infusion). Parahisian pacing demonstrated that the block was at the AV node level among 150 patients with VA dissociation at baseline. Among patients presenting with supraventricular tachycardia (SVT), 98.7% with atrioventricular nodal reentrant tachycardia (AVNRT) had VA conduction at baseline versus 82.7% presenting with other SVT (atrial fibrillation excluded),P
Source: Journal of Interventional Cardiac Electrophysiology - Category: Cardiology Source Type: research

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Source: Archivos de Cardiologia de Mexico - Category: Cardiology Authors: Tags: Arch Cardiol Mex Source Type: research
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Source: International Immunopharmacology - Category: Allergy & Immunology Authors: Tags: Int Immunopharmacol Source Type: research
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Source: American Heart Journal - Category: Cardiology Source Type: research
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Source: Frontiers in Pharmacology - Category: Drugs & Pharmacology Source Type: research
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Source: Multiple Sclerosis and Related Disorders - Category: Neurology Source Type: research
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Source: Journal of Thoracic Disease - Category: Respiratory Medicine Tags: J Thorac Dis Source Type: research
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Source: Pacing and Clinical Electrophysiology : PACE - Category: Cardiology Authors: Tags: ELECTROPHYSIOLOGY Source Type: research
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Source: Canadian Journal of Cardiology - Category: Cardiology Source Type: research
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