Unexplained Irreversible Sudden Termination of an Atypical Atrial Tachycardia for Atrial Fibrillation - What is the Mechanism?

Abstract

KeywordsAtypical atrial tachycardia, Catheter ablation, Sudden termination IMAGE ARTICLE Check for updates CaseA 56-year-old woman without any significant past illnesses was suffering from frequent palpitations due to drug refractory paroxysmal atrial fibrillation (AF). The findings from the chest X-ray, laboratory data including the thyroid hormone level, and echocardiography data Key Clinical MessageCareful attention should be paid to the area behind the Eustachian ridge, if an unexpected sudden termination of an AT occurs after a prior cavo-tricuspid isthmus ablation. The surface electrocardiogram during an atrial tachycardia (AT) (a); The P wave polarity during the AT was biphasic in leads II, III, and aVF, and flat in leads I and V1. The AT cycle length was 500 ms. The course of the AT without covering the entire cycle length can be visualized from the CS ostium to the LRA (b) (arrow; red→yellow→green→blue→purple).LRA: Lateral right atrium.