This document discusses atrioventricular nodal reentrant tachycardia (AVNRT), which accounts for about 2/3 of paroxysmal supraventricular tachycardia cases. It involves a dual pathway in the AV node allowing for a reentrant circuit. Management in the acute setting includes vagal maneuvers, adenosine, or calcium channel blockers, while long term management may involve medications like digoxin, beta blockers, or calcium channel blockers. Catheter ablation has a 95% success rate but a 1% risk of AV block, and is recommended for severe, frequent, or medication-resistant cases.

6. Management of AVNRT ACC/AHA/ESC guidelines for the management of patients with supraventricular arrhythmias--executive summary: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and the European Society of Cardiology Committee for Practice Guidelines (Writing Committee to Develop Guidelines for the Management of Patients With Supraventricular Arrhythmias). 2003

10. V1 II