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Double Pulmonary Vein Response to a Single Atrial Stimulation

Double ventricular responses are defined when 1 atrial stimulus generates 2 ventricular activations. It is postulated that double ventricular responses can occur when 1 atrial stimulus conducts to the ventricle concurrently by way of 2 separate conducting pathways and results in 2 successive ventricular activations (1-to-2 atrioventricular [AV] conduction). The 2 conducting pathways generally comprise fast and slow AV nodal pathways but may rarely involve a set of an accessory AV pathway (rapidly conducting pathway) and the AV node-His conducting pathway (slowly conducting pathway).