ICD-11

Tachycardia originating at or above the atrioventricular (AV) node, usually with a narrow QRS or QRS complex similar to the sinus QRS morphology.

A macro-reentrant tachycardia involving the atria and ventricles in series that uses the atrioventricular node or an accessory pathway for one limb of the circuit and an accessory pathway for the other.

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. The Wolff-Parkinson-White "Syndrome" diagnosis is reserved for patients who have both preexcitation on ECG (manifest conduction) and tachyarrhythmias.

An atrioventricular reciprocating tachycardia that uses the atrioventricular node for retrograde conduction and the accessory pathway for anterograde conduction resulting in a wide complex tachycardia.

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.