Successful Termination of Slow Atrial Tachycardia With 1:1 Atrioventricular Conduction Using a Pacemaker Atrial Antitachycardia Pacing Algorithm

Figures

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  FIGURE 1. (A) Three‐dimensional (3D) computed tomography showing interrupted inferior vena cava (IVC) with azygos continuation in anteroposterior (A‐P) view. CS, coronary sinus; RA, right atrium; SVC, superior vena cava. (B) A 12‐lead ECG showing sinus bradycardia due to sinus node dysfunction. (C) A 12‐lead ECG showing supraventricular tachycardia with a cycle length of 375 ms. Panels B and C are shown at 25 mm/s with voltage gains of 5 and 10 mm/mV, respectively. (D) Chest radiograph after transvenous dual‐chamber pacemaker implantation in the anteroposterior view.

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  FIGURE 2. Successful termination of atrial tachycardia by atrial antitachycardia pacing (ATP). (A) Device electrograms demonstrating a regular atrial tachycardia with a stable cycle length (mean PP interval 521 ms), fulfilling the detection criteria. (B) Delivery of the first ramp atrial ATP. Blue vertical bars, highlighted by red arrows, indicate atrial ATP stimuli. The atrial tachycardia was terminated by ramp atrial ATP pacing. (C) Device electrograms demonstrating a regular atrial tachycardia with a stable cycle length (mean PP interval 382 ms). Delivery of the first ramp atrial ATP. Blue vertical bars, highlighted by red arrows, indicate atrial ATP stimuli. The atrial tachycardia was terminated by ramp atrial ATP pacing.