A Case of Focal Atrial Tachycardia from Inferior Tricuspid Annulus Origin

概要

論文の詳細を見る
Twenty-four years old female without structural heart disease underwent catheter ablation guided by the noncontact mapping system for incessant atrial tachycardia (AT). AT cycle length was relatively long as 600 msec. AT initiated spontaneously during isoproterenol infusion or at atrial burst pacing which indicates abnormal automaticity as its mechanism. P-wave morphology on 12-leads electrocardiogram (ECG) was negative in leads II, III, aVF, V1-6, positive in leads aVR, aVL, and biphasic (negative/positive) in lead I. Noncontact mapping showed focal activation arises from inferior TA (6 o’clock direction) with preferential conduction along infero-medial site of the right atrium. Radiofrequency (RF) energy was applied on the origin and proximal portion of preferential conduction, which successfully eliminated AT. Noncontact mapping system guided RF was efficient and time saving for AT originated form inferior TA.