Atrioventricular Reentrant Tachycardia (AVRT)
In typical AVNRT, retrograde P waves occur early, so we either don’t see them (buried in QRS) or partially see them (pseudo R’ wave at terminal portion of QRS complex). In AVRT, retrograde P waves occur later, with a long RP interval > 70 msec - Robert Buttner
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Common Types of Supraventricular Tachycardia: Diagnosis and Management
The second most common type of SVT is AVRT. Patients with this arrhythmia typically present at a younger age than those with AVNRT. This SVT is caused by accessory pathways (or bypass tracts) that serve as aberrant conduits for impulses that pass from the sinoatrial node and travel in an antegrade or retrograde fashion through such tracts, establishing a reentry circuit. AVRT, occasionally comorbid with Wolff-Parkinson-White syndrome, is a diagnosis not to be missed because this rhythm may spontaneously develop into atrial fibrillation. Key electrocardiography (ECG) findings, such as a delta wave, are not always apparent because of the accessory pathway being concealed; therefore, special diagnostic…Articles of Interest
Atrioventricular Re-entry Tachycardia (AVRT)
Atrioventricular Re-entry Tachycardia (AVRT) is a form of paroxysmal supraventricular tachycardia that occurs in patients with accessory pathways, usually due to formation of a re-entry circuit between the AV node and accessory pathway. ECG features depend on the direction of conduction, which can be orthodromic or antidromic.
Atrioventricular Reentrant Tachycardia (AVRT) in Children
AV reentrant tachycardia (AVRT) is a type of heart rhythm disorder that begins in the upper chambers of the heart (atria) and travels through an extra abnormal pathway, called an accessory pathway or bypass tract. An accessory pathway is an extra band of tissue/fibers that connect the atria to the ventricles.
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ScienceDirect
Patients with AVRT experience symptoms characteristic of paroxysmal supraventricular tachycardia, including rapid and regular palpitations, chest pain, shortness of breath, presyncope, and rarely, syncope.
StatPearls
The differential diagnosis of orthodromic atrioventricular reentry tachycardia includes all regular narrow complex SVT such as AVNRT, sinus tachycardia, and a flutter. The differential diagnosis of antidromic tachycardia should include regular wide complex tachycardia including ventricular tachycardia.
