Definition
Tachycardia secondary to accessory connection(s) (pathway[s]). Typical accessory pathways are extra nodal pathways that connect the myocardium of the atrium and the ventricle across the atrioventricular groove and are classified by location, type of conduction (decremental versus nondecremental), and whether they are capable of anterograde (manifest, demonstrating pre-excitation on standard ECG) or retrograde (concealed) conduction, or both. During orthodromic tachycardia, the re-entrant impulse conducts over the atrioventricular node and the specialized conduction system from the atrium to the ventricle and utilizes the accessory connection (pathway) for conduction from the ventricle to the atrium.
Index Terms
Atrioventricular reciprocating tachycardia, antidromicAtrioventricular reciprocating tachycardia, antidromic (typically wide QRS)Atrioventricular reentry tachycardia, antidromicAtrioventricular reciprocating tachycardia, antidromic utilizing accessory pathway with bidirectional conductionAtrioventricular reentry tachycardia, antidromic utilizing accessory pathway with bidirectional conductionAtrioventricular reciprocating tachycardia, antidromic utilizing accessory pathway with unidirectional conduction, antegrade onlyAtrioventricular reentry tachycardia, antidromic utilizing accessory pathway with unidirectional conduction (antegrade only)Atrioventricular reciprocating tachycardia, antidromic utilizing atrio-fascicular accessory pathway with unidirectional conduction, antegrade onlyAtrioventricular reentry tachycardia, antidromic utilizing atrio-fascicular accessory pathway with unidirectional conduction (antegrade only)Atrioventricular reciprocating tachycardia, antidromic utilizing atrio-ventricular accessory pathway with unidirectional conduction, antegrade onlyAtrioventricular reentry tachycardia, antidromic utilizing atrio-ventricular accessory pathway with unidirectional conduction (antegrade only)Atrioventricular reciprocating tachycardia, antidromic utilizing nodo-fascicular accessory pathway with unidirectional conduction, antegrade onlyAtrioventricular reentry tachycardia, antidromic utilizing nodo-fascicular accessory pathway with unidirectional conduction (antegrade only)