Orthodromic Reentry Tachycardia - conduction via AV node-His-Purkinje system to the ventricle, and retrograde conduction via accessory pathway.
Antidromic Reentry Tachycardia (ART) - antegrade conduction via accessory pathway to the ventricle, and retrograde conduction via His-Purkinje system and AV node.
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