Figure 1 A: Surface electrocardiogram ( ECG) at
baseline. B: Intracardiac ECG at baseline. C: Surface
ECG during AT. D: Intracardiac ECG during atrial tachycardia
(AT). E: The activation map during AT. Yellow arrows indicate
the suspected tachycardia circuit. CS, coronary sinus; LAA, left atrial
appendage; LPV, left pulmonary vein; MA, mitral annulus; PPI, post
pacing interval; TCL, tachycardia cycle length.