Reversal of the Activation Sequence along the Coronary Sinus during RF Application with a Single Left Lateral Pathway:.

The article discusses a 16-year-old female patient who underwent catheter ablation after presenting with a four-year history of recurrent supraventricular tachycardia. Following catheterization and three radio frequency (RF) energy applications during sinus rhythm, another type of tachycardia was induced. After relocation of the coronary sinus (CS) catheter, the CS3-4 electrodes indicated double atrial potentials with a 40-millisecond interval. The changed tachycardia mechanism is examined.