Atrioventricular nodal reentry tachycardia
AVNRT is caused by a short circuit loop created by the existence of 2 electrical pathways within the AV node termed the "fast" and "slow" pathways. "Typical" AVNRT refers to antegrade conduction down the slow pathway, with the fast pathway serving as the retrograde limb. "Atypical" AVNRT involves antegrade conduction down the fast pathway, and the slow pathway serves as the retrograde limb.
AVNRT is more common in women than men. Patients usually present after 20 years of age, with a mean age of onset of 32 years old. AVNRT makes up two-thirds of all PSVTs.
In most cases, there is no apparent precipitating cause or trigger for episodes of AVNRT. However, in some patients, nicotine, alcohol, stimulants, exercise, activities, or medications may contribute, possibly by increasing vagal tone.
I47.1 – Supraventricular tachycardia
251166008 – AV nodal re-entry tachycardia
Differential Diagnosis & Pitfalls
Drug Reaction Data