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Figure 1 Termination With Adenosine of Focal AT Arising From the Anteroseptal Left Atrium

Shown are surface leads I, aVF, and V₁, intracardiac bipolar recordings from the His bundle (HIS), coronary sinus (CS), and a multipolar catheter around the tricuspid annulus (RA-Halo). After adenosine 6 mg, the tachycardia cycle length slows before termination of the arrhythmia. AT = atrial tachycardia; d = distal; SR = sinus rhythm.