| http://www.w3.org/ns/prov#value | - The present invention is a method for treating atrial arrhythmias by forming a circumferential conduction block which is located either (a) along a circumferential path of tissue in a pulmonary vein wall which circumscribes the pulmonary vein lumen and transects the electrical conductivity of the pulmonary vein relative to its longitudinal axis, or (b) along a circumferential path of tissue in a l
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