These are recordings from a 73 year old patient with recurrent episodes of relatively slow atrial flutter. No episode of atrial fibrillation was documented. Ablation was attempted because of the slow response and the potential danger of the anti-arrhythmic drugs.

The first tracing is with an atrial Halo catheter with the patient in flutter

The second recording is termination of the atrial flutter with the application of radio-frequency energy

The third recording is after the ablation with pacing at the proximal coronary sinus