Abstract
A 69-year-old woman underwent catheter ablation of requent episodes of paroxysmal supraventricular tachycaria. Electrophysiological study demonstrated an incessant ocal atrial tachycardia (AT) with a cycle length of 420 ms. iatrial electroanatomical mapping using the CARTO sysem (Biosense-Webster, Diamond Bar, CA) located the arly sites of activation on the interatrial septum just poserior to the His bundle region. Attempts at ablation from oth the right and left atrial aspects of the septum were nsuccessful. By registration of the right atrium (RA) and the aorta, a reprocedural computed tomography (CT) image was suerimposed on the electroanatomic maps. A 4-mm-tip Naistar ablation catheter (Biosense-Webster) was passed rom the right femoral artery to the aortic root and was ositioned in the noncoronary sinus of Valsalva, just oppo-
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